Orion Control Systems AAON VCCX2 Technical Manual

Service Tool SD Code: DT001240-001/SS1063 Version 1.11 and up System Manager SD Code: DT002150-001/SS1068 Version 1.11 and up System Manager Touch Screen (Limited Access): DT004254-001/SS7013

All manuals are also available for download from www.aaon.com/controlsmanuals. www.aaon.com VCCX2 CONTROLLER TECHNICAL GUIDE REVISION AND DATE CHANGE Rev. 01N, January 20, 2020 Liquid Line 1-4 Solenoid relay configurations changed to A1,A2,B1,B2 Comp Run Status in relay table and in wiring illustrations Rev. 01N, January 20, 2020 Added BI: 126 - Exhaust Fan / Return Fan Proof of Flow Alarm Rev. 01N, February 13, 2020 Added 11 = OA Damper Calibration to BACnet® AI:3 Rev. 01N, July 14, 2020 Miscellaneous minor edits Rev. 01P, October 1, 2020 Added RSMZ module and BACnet® parameters Rev. 01P, October 1, 2020 Added Subcool Monitor Module and BACnet® parameters Rev. 01P, December 11, 2020 10-foot cable changed to 25-foot cable for E-BUS Outdoor Air and Humidity sensors Rev. 01P, December 11, 2020 Revision to Sump Heater and Sump Drain Enable operation Rev. 01P, December 11, 2020 Added BACnet® AV:94 Sump Drain Override Rev. 01P, January 21, 2021 Added SIG1 - Return Air Plenum Pressure Sensor and AOUT4 - Modulating Exhaust Damper to VCC-X EM1 Wiring Rev. Q, March 24, 2021 Updated RSMZ Trendlog tables, updated labels, miscellaneous minor edits Rev. R, May 26, 2021 Updated BACnet® points to latest VCCX2 software, updated Appendix A figures, various cosmetic updates AAON, Inc. 2425 South Yukon Ave. Tulsa, OK 74107-2728 www.aaon.com Factory Technical Support Phone: 918-382-6450 Controls Support Phone: 866-918-1100 All rights reserved. © May 2021 AAON, Inc. It is the intent of AAON® to provide accurate and current product information. However, in the interest of product improvement, AAON® reserves the right to change pricing, specifications, and/or design of its product without notice, obligation, or liability. AAON P/N: G039840, Rev. R AAON® is a registered trademark of AAON, Inc., Tulsa, OK. Danfoss VFD® is a registered trademark of Danfoss Commercial Compressors, S.A., Tallahassee, FL BACnet® is a registered trademark of ASHRAE Inc., Atlanta, GA. EBTRON® is a registered trademark of Ebtron, Inc., Loris, SC. GreenTrolTM is a registered trademark of GreenTrol Automation, Inc. Loris, SC. Paragon MicroTransEQ Series Airflow Monitoring Station is a registered trademark of Paragon Controls, Inc., Santa Rosa, CA. White-Rodgers® is a registered trademark of Emerson Climate Technologies, Inc., St. Louis, MO Copeland Scroll™ is a registered trademark of Emerson Electric Co., Sidney, OH

TABLE OF CONTENTS OVERVIEW........................................................................................................................ 9 System Features...................................................................................................................................................... 9 Applications............................................................................................................................................................ 10 Part Number Cross Reference................................................................................................................................11 Parts and Descriptions........................................................................................................................................... 12 VCCX2 Controller Components............................................................................................................................. 19 DIMENSIONS.................................................................................................................. 20 VCCX2 Controller ................................................................................................................................................. 20 Refrigerant System Module (RSM) ...................................................................................................................... 21 VCC-X EM1 Expansion Module............................................................................................................................. 22 12 Relay E-BUS Module........................................................................................................................................ 23 WIRING........................................................................................................................... 24 Important Wiring Considerations............................................................................................................................ 24 VCCX2 Controller Inputs........................................................................................................................................ 25 VCCX2 Controller Outputs..................................................................................................................................... 26 E-BUS Digital Room Sensor.................................................................................................................................. 27 Wall-Mounted E-BUS CO2 Sensor......................................................................................................................... 28 Duct-Mounted E-BUS CO2 Sensor........................................................................................................................ 29 Space Temperature Sensor................................................................................................................................... 30 Supply Air Temperature Sensor............................................................................................................................. 31 Return Air Temperature Sensor............................................................................................................................. 32 Building Pressure Sensor...................................................................................................................................... 33 Remote SAT Reset................................................................................................................................................ 34 E-BUS Outdoor Air Temperature Sensor............................................................................................................... 35 E-BUS Outdoor Air Temperature and Humidity Sensor......................................................................................... 36 E-BUS Return Air Temperature and Humidity Sensor........................................................................................... 37 Duct Static Pressure Transducer........................................................................................................................... 38 Supply Fan VFD or Bypass Damper Actuator........................................................................................................ 39 Economizer Actuator or WSE Actuator.................................................................................................................. 40 Modulating Heating Device.................................................................................................................................... 41 Building Pressure Control Outputs......................................................................................................................... 42 Entering Water Temp Sensor, RA Plenum, and Return/Exhaust Proof of Flow..................................................... 43 VCC-X EM1 Entering Water Temperature Sensor................................................................................................. 44 VCC-X EM1 Expansion Module Inputs.................................................................................................................. 45 VCC-X EM1 Expansion Module Outputs............................................................................................................... 46 Chilled Water Valve Actuator.................................................................................................................................. 47 Return Air Bypass.................................................................................................................................................. 48 12 Relay E-BUS Expansion Module...................................................................................................................... 49 EBTRON®, GreenTrolTM, and Paragon Digital Transmitters................................................................................... 50 RSMV Inputs.......................................................................................................................................................... 51 RSMV Outputs....................................................................................................................................................... 52

RSMV-HP Inputs.................................................................................................................................................... 53 RSMV-HP Outputs................................................................................................................................................. 54 RSMD Inputs.......................................................................................................................................................... 55 RSMD Outputs....................................................................................................................................................... 56 RSMZ Inputs.......................................................................................................................................................... 57 RSMZ Outputs....................................................................................................................................................... 58 Subcool Monitor Module........................................................................................................................................ 59 MHGRV-X.............................................................................................................................................................. 60 MODGAS-X........................................................................................................................................................... 61 MODGAS-XWR2................................................................................................................................................... 62 PREHEAT-X and PREHEAT-X-EXT....................................................................................................................... 63 START-UP AND COMMISSIONING................................................................................ 64 Powering Up and Configuration............................................................................................................................. 64 INPUTS AND OUTPUTS................................................................................................. 65 VCCX2 Controller and EM1 Module Input/Output Maps........................................................................................ 65 VCCX2 Controller Inputs........................................................................................................................................ 66 VCCX2 Controller Outputs..................................................................................................................................... 67 VCC-X EM1 Expansion Module............................................................................................................................. 68 12 Relay E-BUS Expansion Module...................................................................................................................... 69 SEQUENCE OF OPERATIONS........................................................................................ 70 Supply Fan and Occupied/Unoccupied Operation................................................................................................. 70 HVAC Modes of Operation..................................................................................................................................... 71 Economizer Operation........................................................................................................................................... 73 Dehumidification Mode.......................................................................................................................................... 74 Reheat, Coil Suction, and Return Air Bypass Damper........................................................................................... 75 Heating Mode......................................................................................................................................................... 76 Ventilation Mode, Remote Contact Control, and Space Sensor Operation........................................................... 77 IAQ Control, Morning Warm-Up and Cool-Down, and Single Zone VAV............................................................... 79 Airflow Monitoring, Preheater, Low Ambient and Duct Static Press ...................................................................... 81 Duct Static Setpoint Reset and Duct Static Pressure Control................................................................................ 82 Building Pressure Control and Exhaust Duct Static Pressure Control................................................................... 83 MUA, CAV/MUA, and Space Temperature Control................................................................................................ 84 VAV w/SA Tempering, Air to Air Heat Pump and Standard Defrost........................................................................ 85 Heat Pump Adaptive Defrost, WSHP, EXV and Head Pressure............................................................................ 86 Evaporative Condenser, WSE, OA Lockouts and Temp Protection....................................................................... 87 Alarm Detection and Sensor Failure Alarms.......................................................................................................... 89 Mechanical Failure and Failure Mode Alarms........................................................................................................ 91 Title 24 Economizer Alarms................................................................................................................................... 92 VCCX2 Controller Trend Logs............................................................................................................................... 93 RSMV/RSMD/RSMZ Trend Logs and Trend Log Enumerated Values.................................................................. 94 RSMZ Trend Logs and Trend Log Enumerated Values......................................................................................... 95 TABLE OF CONTENTS

RSMZ Trend Logs and Trend Log Enumerated Values......................................................................................... 96 Trend Log Bit String Decoding............................................................................................................................... 97 TROUBLESHOOTING................................................................................................... 100 VCCX2 Controller and EM1 LED Diagnostics..................................................................................................... 100 Temperature Sensor Testing................................................................................................................................ 102 Duct Static Pressure and Building Pressure Sensor Testing............................................................................... 103 APPENDIX A - SYSTEM CONFIGURATION................................................................. 104 System Configurations......................................................................................................................................... 104 Stand-Alone System Layout................................................................................................................................ 105 Networked System Single Loop Layout............................................................................................................... 106 Networked System Multiple Loop Layout............................................................................................................. 107 APPENDIX B - VCCX2 LCD SCREENS......................................................................... 108 Navigation Keys................................................................................................................................................... 108 Main Screens Map............................................................................................................................................... 109 Setting Screens.....................................................................................................................................................110 Status Screens......................................................................................................................................................111 Alarm Screens......................................................................................................................................................112 Output Override Screens......................................................................................................................................113 Air Balance Screens and Factory Test Mode Screen...........................................................................................114 APPENDIX C - VCCX2 BACNET®.................................................................................. 115 VCCX2 BACnet® Parameters...............................................................................................................................115 VCCX2 BACnet® Bitfields.................................................................................................................................... 132 VCCX2 BACnet® PICS......................................................................................................................................... 134 INDEX........................................................................................................................... 135 TABLE OF CONTENTS

FIGURES FIGURES Figure 1: VCCX2 Controller Components ...............................................................................................................19 Figure 2: VCCX2 Controller Dimensions..................................................................................................................20 Figure 3: Typical Refrigerant System Module Dimensions (RSMV Shown).............................................................21 Figure 4: VCC-X EM1 Expansion Module Dimensions............................................................................................22 Figure 5: 12 Relay E-BUS Module Dimensions.......................................................................................................23 Figure 6: VCCX2 Controller Input Wiring.................................................................................................................25 Figure 7: VCCX2 Controller Output Wiring..............................................................................................................26 Figure 8: E-BUS Digital Room Sensor Wiring..........................................................................................................27 Figure 9: Wall-Mounted E-BUS CO2 Sensor Wiring.................................................................................................28 Figure 10: Duct-Mounted E-BUS CO2 Sensor Wiring................................................................................................29 Figure 11: Space Temperature Sensor Wiring and Slide Adjust................................................................................30 Figure 12: Supply Air Temperature Sensor Wiring ....................................................................................................31 Figure 13: Return Air Temperature Sensor Wiring ....................................................................................................32 Figure 14: Building Pressure Sensor Wiring..............................................................................................................33 Figure 15: Remote SAT Reset Signal Wiring.............................................................................................................34 Figure 16: Outdoor Air Temperature Sensor Wiring...................................................................................................35 Figure 17: E-BUS Outdoor Air Temperature and Humidity Sensor Wiring.................................................................36 Figure 18: E-BUS Return Air Temperature and Humidity Sensor Wiring...................................................................37 Figure 19: Static Pressure Transducer Wiring...........................................................................................................38 Figure 20: Supply Fan VFD Wiring............................................................................................................................39 Figure 21: Economizer Damper Actuator or WSE Valve Actuator Wiring...................................................................40 Figure 22: Modulating Heating Device Wiring............................................................................................................41 Figure 23: Building Pressure Control Output Wiring..................................................................................................42 Figure 24: Entering Water Temperature Sensor, Return Air Plenum Pressure and Return/Exhaust Proof of Flow...................................................................................................................43 Figure 25: Entering Water Temperature Sensor.........................................................................................................44 Figure 26: VCC-X EM1 Exhaust Duct Static Pressure and Economizer Actuator Feedback Wiring.........................45 Figure 27: VCC-X EM1 Expansion Module Output Wiring.........................................................................................46 Figure 28: Chilled Water Valve Actuator Wiring.........................................................................................................47 Figure 29: Return Air Bypass Wiring..........................................................................................................................48 Figure 30: 12 Relay E-BUS Expansion Module Wiring..............................................................................................49 Figure 31: EBTRON® GTC116 or HTN104 Series, GreenTrolTM GA-200-N Series, and Paragon MicroTransEQ Series Airflow Measurement Digital Transmitter Wiring............................................................................50 Figure 32: RSMV Inputs Wiring..................................................................................................................................51 Figure 33: RSMV Outputs Wiring...............................................................................................................................52 Figure 34: RSMV-HP Inputs Wiring............................................................................................................................53 Figure 35: RSMV-HP Outputs Wiring.........................................................................................................................54 Figure 36: RSMD Inputs Wiring.................................................................................................................................55 Figure 37: RSMD Outputs Wiring...............................................................................................................................56 Figure 38: RSMZ Inputs Wiring..................................................................................................................................57 Figure 39: RSMZ Outputs Wiring...............................................................................................................................58 Figure 40: Subcool Monitor Wiring.............................................................................................................................59

FIGURES Figure 41: MHGRV-X to VCCX2 Controller Wiring ....................................................................................................60 Figure 42: MODGAS-X to VCCX2 Controller Wiring..................................................................................................61 Figure 43: MODGAS-XWR2 to VCCX2 Controller Wiring..........................................................................................62 Figure 44: PREHEAT-X to VCCX2 Controller Wiring ................................................................................................63 Figure 45: Modular Service Tool SD, Modular System Manager SD, System Manager TS-L, and Prism 2 Software Operator Interfaces................................................................................................64 Figure 46: VCCX2 Controller LED Locations...........................................................................................................101 Figure 47: VCC-X EM1 Expansion Module LED Locations.....................................................................................101 Figure 48: Typical Stand-Alone System Layout.......................................................................................................105 Figure 49: Typical Networked Single Loop System Layout......................................................................................106 Figure 50: Typical Networked Multiple Loop System Layout...................................................................................107 Figure 51: LCD Display and Navigation Keys..........................................................................................................108 Figure 52: VCCX2 BACnet® Connection to MS/TP Network....................................................................................115

TABLES TABLES Table 1: Voltage and Environment Requirements................................................................................................... 24 Table 2: VCCX2 Controller Inputs and Outputs ..................................................................................................... 65 Table 2: VCCX2 Controller Inputs and Outputs (continued)................................................................................... 65 Table 3: VCC-X EM1 Inputs and Outputs .............................................................................................................. 65 Table 4: User-Configurable Relay Outputs............................................................................................................. 69 Table 5: VCCX2 Controller Trend Logs................................................................................................................... 93 Table 6: RSMZ Module Trend Logs........................................................................................................................ 94 Table 7: RSMV/RSMD Module Trend Logs............................................................................................................. 94 Table 8: Trend Log Enumerated Values.................................................................................................................. 95 Table 9: RSMZ Module Comp Status Trend Log.................................................................................................... 95 Table 10: RSMZ Module RSM Alarm Trend Log....................................................................................................... 95 Table 11: RSMZ Module VFD Status Trend Log....................................................................................................... 96 Table 12: RSMZ Module VFD Alarm 1 Trend Log..................................................................................................... 96 Table 13: RSMZ Module VFD Alarm 2 Trend Log..................................................................................................... 96 Table 14: VCCX2 Trend Log Bit Strings.................................................................................................................... 98 Table 14: VCCX2 Trend Log Bit Strings (continued)................................................................................................. 98 Table 14: VCCX2 Trend Log Bit Strings (continued)................................................................................................. 99 Table 15: 0-5V Temperature Sensor - Voltage and Resistance for Type III Sensors.............................................. 102 Table 16: Duct Static Pressure/Voltage for Duct Static Pressure Sensors............................................................. 103 Table 17: Building Static Pressure/Voltage for Building Pressure Sensors............................................................. 103 Table 18: Navigation Key Functions........................................................................................................................ 108 Table 19: Editing Key Functions.............................................................................................................................. 108

Features The VCCX2 Controller is designed with eight analog inputs, four analog outputs, eight binary inputs, and eight relay outputs (seven configurable). It also has an on-board BACnet® port for connection to an MS/TP network. The VCCX2 contains a 2 x 8 LCD character display and four buttons that allow for status and alarm display, force modes, and BACnet® configuration. The VCCX2 Controller can communicate with the Refrigerant System Module for VFD Compressors, Refrigerant System Module for VFD Compressors - Heat Pump, Refrigerant System Module for Digital Compressors, and Refrigerant System Module for VFD Compressors (RZ or RN-E units with Danfoss compressors). In addition, the VCC-X EM1 Expansion Module and 12 Relay E-BUS Expansion Module provide additional inputs and outputs. There are two E-BUS Expansion Connectors on the VCCX2 which allow for the connection of the expansion modules listed above, communicating sensors, and future E-BUS modules via modular E-BUS cables. There are presently seven communicating sensors available. • E-BUS Digital Space Temperature Sensor • E-BUS Digital Space Temperature and Humidity Sensor • E-BUS Space Temperature and Humidity Sensor • E-BUS Space CO2 Sensor • E-BUS Duct CO2 Sensor • E-BUS Horizontal or Vertical Outdoor Air Temperature and Humidity Sensor • E-BUS Return Air Temperature and Humidity Sensor. The VCCX2 Controller provides for the following applications: Constant Volume, VAV, Single Zone VAV, Make-up Air, and Space Temperature Control of High Percentage Outdoor Air. Other features of the VCCX2 include: • Controls up to eight digital compressors • Controls up to four sets of tandem VFD compressors • Controls up to 12 stages of heat • Modulating Cooling Output for Chilled Water Valve Control • Modulating Heating Output (Hot Water Valve, Steam Valve, SCR Electric Heat Control) • Full Integration with the AAON® Refrigerant System Modules (RSM) • Full Integration with the AAON® MODGAS-X Module • Full Integration with the AAON® MHGRV-X Modulating Hot Gas Reheat Valve Module • Full Integration with the AAON® PREHEAT-X Module • Advanced Dehumidification Capabilities • Air to Air Heat Pump and Water Source Heat Pump applications • Airflow monitoring of Outdoor Air, Supply Air, Return Air, and Exhaust Air Streams with approved EBTRON®, GreenTrolTM, or Paragon Airflow Monitoring Stations • Airflow control of Outdoor Air Damper • Single Zone VAV Control w/Optional CAV Heating • Primary/Secondary Heating Control • Remote Forced Cooling, Heating, and Dehumidification Control • Remote Supply Air Temperature Reset Signal • Adaptive Supply Air Temperature Reset • Selectable Mode Enable Sensor • Fan Proving Interlock • Dirty Filter Alarm • Emergency Shutdown Input (Smoke Detector/Firestat or other Shutdown Conditions) • Drybulb/Wetbulb/Dewpoint control of Economizer Operation • Waterside Economizer Capability • Building Pressure Control (Direct or Reverse Acting) • Exhaust Duct Static Control of Exhaust Fan • Remote Forced Occupied Capability • Configurable for AAON® Return Air Bypass Applications • IAQ Economizer Reset • Title 24 Economizer Certified • Seven-Day, Two-Event-per-Day Scheduling • 14 Holiday Event Scheduling • Daylight Saving Time Adjustment • Trend Logging Capability • Static Pressure Control for Filter Loading Applications • Heat Wheel - On/Off Control • Head Pressure Control • On-board BACnet® port for connection to an MS/TP network (See Appendix C) OVERVIEW System Features

Variable Air Volume Unit The VCCX2 Controller can control VAV units that are typically designed for occupied Cooling Mode only, where VAV boxes equipped with reheat satisfy heating demands in individual spaces. In this application, unit heat is typically used for Morning Warm-Up. Morning Cool-Down is also available. The controller can be configured to control the supply fan VFD to maintain a Duct Static Pressure Setpoint. The VCCX2 can also control VAV units that may require Occupied Heating operation to “temper” the outdoor air if it is too cold outside for the mixed air to maintain the Cooling Supply Air Setpoint. Constant Air Volume Unit The VCCX2 Controller can be configured for Constant Volume applications that are typically Space Temperature or Return Air Temperature controlled. The VCCX2 can also be used for restaurant kitchen or lab applications that are 100% outdoor air part of the time and Recirculating Air part of the time. A Hood On binary input forces the VCCX2 to switch to 100% outdoor air control based on an Exhaust Hood Switch activation. The VCCX2 requires Outdoor and Indoor Air Temperature (and Humidity) Sensors to accomplish this application. Single Zone VAV This is a hybrid CAV/VAV application for a unit serving a single space and using Space Temperature Setpoints to enable Heating and Cooling Modes. Heating and cooling are controlled to their respective Supply Air Setpoints while the supply fan modulates to maintain the Space Temperature Setpoints. Single Zone VAV applications can be configured for VAV Cooling and either VAV or CAV Heating. Single Zone VAV operation requires the use of modulating heating or cooling sources. Space Temperature Control of High Percentage Outdoor Air Units This application allows the unit to be configured to use the space temperature to initiate Cooling and Heating Modes on units that are high percentage outdoor air or 100% outdoor air units. Before entering the Space Vent Mode, the VCCX2 will first determine if the Outdoor Air Temperature is above or below special Outdoor Air Cooling and Heating Setpoints. If so, the unit will leave stages of cooling or heating on as necessary to achieve a neutral Supply Air Temperature – thus avoiding dumping very hot or cold air into the space. Make-Up Air Unit The VCCX2 can be configured for 100% Outdoor Air control for Make-Up Air units. All HVAC Modes are determined from the Outdoor Temperature and Humidity Sensors. The Outdoor Air Volume should be at least 50% or higher to be configured for Outdoor Air control. AAON® Return Air Bypass Control This control scheme can only be used on Constant Volume HVAC units that are equipped with a Return Air Bypass Damper and that use Space Temperature and Humidity Sensors as the controlling sensors. AAON® Return Air Bypass Control provides improved moisture removal capabilities while utilizing internal space loads for reheat by redirecting Return Air from the upstream side of the DX Evaporator Coil to the downstream side of the coil during Dehumidification. Zone Voting The VCCX2 can be configured to be the unit controller in a zone voting system where the individual zones vote to put the unit into occupied Cooling or Heating Mode. To be used in this application, Orion zone controllers must also be used in order to allow communication between the zones and the VCCX2. Duct Static Pressure Control can be accomplished with a supply fan VFD or a bypass damper. OVERVIEW Applications

PART DESCRIPTION ORION AAON VCCX2 Controller OE338-26B-VCCX2 ASM01698 VCC-X EM1 Expansion Module OE336-23-VCCXEM1 ASM01691 Refrigerant System Module for VFD Compressors OE370-26-RSMV ASM01686 Refrigerant System Module VFD Compressors - Heat Pump OE370-26-RSMV-HP ASM01693 Refrigerant System Module for Digital Compressors OE370-26-RSMD ASM02201 Refrigerant System Module for VFD Compressors (RSMZ) N/A ASM02351 Subcool Monitor Module N/A ASM02350 12 Relay E-BUS Expansion Module OE358-23E-12R ASM01873 Building Static Pressure Transducer OE258-01 ASM01832 CommLink 5 Communications Interface OE361-13 ASM01874 Duct Static Pressure Transducer and Pickup Tube OE271 and OE290 ASM01640 and ASM02242 Duct Temperature Sensor - 6” or 12” OE230 / OE231 G051240 / G051250 E-BUS Cable Assembly E-BUS Power and Comm 1.5 ft., 3 ft., 10 ft., 25 ft., 50 ft., 75 ft., 100 ft., 150 ft., 250 ft., and 1000 ft. Spool EBC-1.5F, EBC-3F, EBC-10F, EBC-25F, EBC-50F, EBC-75F, EBC-100F, EBC-150F, EBC-250F, EBC-SPOOL G029440 (1.5 ft..), G012870 (3 ft.), G029460 (10 ft.), G045270 (25 ft.), G029510 (50 ft.), G029530 (75 ft.), G029450 (100 ft.), G029470 (150 ft.), V36590 (250 ft.), G018870 (SPOOL) E-BUS Adapter Hub MS000248 G033970 E-BUS Adapter Hub with 1.5 ft. EBC Cable HZ-EBC-248 ASM01635 E-BUS Adapter Board OE365-15-EBA ASM01878 E-BUS CO2 Space Sensor (wall or duct mounted) OE256-05 / OE256-07 ASM01829 / ASM01831 E-BUS Digital Room Sensor - LCD - Temp. or Temp and RH OE217-02 / OE217-03 ASM01819 / ASM01820 E-BUS Digital Room Sensor - No LCD - Temp and RH OE217-04 ASM02221 E-BUS Horizontal Outdoor Air Temperature and RH Sensor OE265-15 ASM01836 E-BUS Vertical Outdoor Air Temperature and RH Sensor OE265-16 ASM01838 E-BUS Return Air Temperature and RH Sensor OE265-17 ASM01840 E-BUS CO2 Return Air Sensor Emulator Board OE365-07-EBSE ASM01623 E-BUS CO2 Space Sensor Emulator Board OE365-06-EBSE ASM01622 E-BUS Outdoor Air Temp/RH Sensor Emulator Board OE365-05-EBSE ASM01697 E-BUS Return Air Temp/RH Sensor Emulator Board OE365-04-EBSE ASM01621 E-BUS Space Temp/RH Sensor Emulator Board OE365-03-EBSE ASM01696 GPC-XP Controller OE338-23-GPCXP ASM01868 IP Module Kit OE415-02 ASM01902 MHGRV-X Module / Reheat Expansion Module OE377-26-00059 / OE377-01-00059 ASM01670 / ASM01687 MiniLink Polling Device 5 OE364-23-OR ASM01626 MODGAS-X Module OE377-26-00058 ASM01668 MODGAS-XWR2 Module OE377-26-00060-1 ASM01695 Modular Service Tool SD - Operator Interface OE391-12 ASM01895 Modular System Manager SD - Operator Interface OE392-12 ASM01901 Outdoor Air Temperature Sensor OE250 G042230 PREHEAT-X Module / PREHEAT-X-EXT Module OE377-26-00061 / OE377-26-00061-1 ASM01688 / ASM01689 Standard Room Sensor - Plain or W/ Override OE210 / OE211 ASM02227 / ASM01638 Standard Room Sensor - with Setpoint Adjust or Setpoint Adjust and Override OE212 / OE213 ASM01642 / ASM01643 Strap-On Temperature Sensor Kit OE233 ASM01624 Suction Pressure Transducer OE275-01 ASM02222 System Manager TS-L (Touch Screen - Limited Access) OE392-11 ASM01900 USB-Link 2 Kit OE366 ASM02244 OVERVIEW Part Number Cross Reference

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM01698 VCCX2 Controller The VCCX2 Controller provides eight analog inputs, four analog outputs, eight binary inputs, and eight relay outputs. It also has an on-board BACnet® port for connection to an MS/TP network. The Controller contains a 2 x 8 LCD character display and four buttons that allow for status and alarm display as well as BACnet® configuration. It allows for the addition of the Refrigerant System Modules (RSMs), EM1 Expansion Module, and the 12 Relay E-BUS Expansion Module described below. NOTE: Set-up, configuring, and monitoring of the VCCX2 Controller requires one of the following communication interfaces—Prism 2 Front-End Software used with a personal computer, Modular System Manager SD, or Modular Service Tool SD. Pages 25, 26 ASM01686 Refrigerant System Module for VFD Compressors The Refrigerant System Module for VFD Compressors (RSMV) monitors and controls one tandem compressor refrigeration circuit of the HVAC unit. The module is designed for R410-A refrigerant. Up to four RSMV’s can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow for the use of communicating sensors and the E-BUS Modules. The RSMV provides four analog inputs, three binary inputs, three relays, and four analog outputs. It connects with an E-BUS cable to the VCCX2 Controller. Pages 21, 51-52 ASM01693 Refrigerant System Module for VFD Heat Pumps The Refrigerant System Module for VFD Heat Pumps (RSMV-HP) monitors and controls one refrigeration circuit of the HVAC unit. The module is designed for R410-A refrigerant. The RSMV-HP is connected to the VCCX2 Controller. Up to four RSMV-HP’s can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow for the use of communicating sensors and the E-BUS Modules. The RSMV-HP provides six analog inputs, four binary inputs, four relays, and two analog outputs. It connects with an E-BUS cable to the VCCX2 Controller. Pages 21, 53-54 ASM02201 Refrigerant System Module for Digital Compressors The Refrigerant System Module for Digital Compressors (RSMD) monitors and controls one or two refrigeration circuits of the HVAC unit. The module is designed for R410-A refrigerant. Up to four RSMD’s can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow for the use of communicating sensors and the E-BUS Modules. The RSMD provides three analog inputs, four binary inputs, five relays, and two analog outputs. It connects with an E-BUS cable to the VCCX2 Controller. Pages 21, 55-56 ASM02351 Refrigerant System Module for RNZ The Refrigerant System Module for RNZ (RSMZ) monitors and controls one refrigeration circuit of the HVAC unit. The module is designed for R410-A refrigerant. Either three or six RSMZ modules can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow for the use of communicating sensors and the E-BUS Modules. It connects with an E-BUS cable to the VCCX2 Controller. Pages 21, 57-58 ASM02350 Subcool Monitor Module The Subcool Monitor Module reads the liquid line pressure and then converts it to saturated liquid temperature and compares it to the measured liquid line temperature to calculate subcooling. The Subcool Monitor Module is used in conjunction with the RSMZ Module. One or two Subcool Monitors can be connected, depending on the size of the system: • One is used when three RSMZ’s are used • Two are used when six RSMZ’s are used. It connects with an E-BUS cable to the VCCX2 Controller. Page 59 OVERVIEW Parts and Descriptions

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM01668 MODGAS-X Module The MODGAS-X modulates up to two gas valves to maintain a desired Discharge Air Temperature. It also controls the speed of the induced draft fan to maintain proper combustion in the heat exchanger. The MODGAS-X connects to the VCCX2 Controller via an E-BUS cable. Available only from AAON. Page 61 ASM01695 MODGAS-XWR2 Module The MODGAS-XWR2 is designed to be used with White Rogers valves only. It will modulate up to two White Rodgers gas valves to maintain a desired Discharge (Supply) Air Temperature (up to four) modulating gas valves may be controlled when a second MODGAS-XWR2 is configured as a slave module). It also controls the speed of the induced draft fan to maintain proper combustion in the heat exchanger. The MODGAS-XWR2 connects to the VCCX2 Controller via an E-BUS cable. Page 62 ASM01670 MHGRV-X Module The MHGRV-X controls a Modulating Hot Gas Reheat Valve to maintain a desired Supply Air Temperature and Dehumidification Setpoint. The MHGRV-X Controller connects to the VCCX2 Controller via an E-BUS cable. Page 60 ASM01687 MHGRV REHEAT Expansion Module The MHGRV Reheat Expansion Module is designed to control one set of reheat valves. The Reheat Expansion Module connects to the MHGRV-X via an E-BUS communication cable. Connected together, the Reheat Expansion Modules provide a system that allows the proper control of multiple sets of valves. N/A ASM01688 ASM01689 PREHEAT-X and PREHEAT-X-EXT Modules The PREHEAT-X and PREHEAT-X-EXT are designed to control fixed stages of Preheat or optional Modulating Preheat to maintain a desired Preheat Leaving Air Temperature Setpoint. The PREHEAT-X is limited to a 35°F Leaving Air Temperature Setpoint. The PREHEAT-X-EXT Controller has an extended Leaving Air Temperature Setpoint range down to 0°F and should only be used with the approval of AAON. The module directly connects to the VCCX2 Controller or indirectly using an E-BUS Expansion Board via an E-BUS cable. Page 63 ASM01691 VCC-X EM1 Expansion Module The EM1 Expansion Module adds Title 24 Economizer Feedback and Chilled Water applications. It also provides a Duct Static input for Exhaust Fan control, Return Air Plenum Pressure Control, and Return/Exhaust Proof of Flow. It provides two analog outputs for controlling a Return Air Bypass Damper and a Return Damper in Return Air Bypass applications.. It also has five configurable relay outputs. It connects with an E-BUS cable to the VCCX2 Controller. Pages 22, 45-48 OVERVIEW Parts and Descriptions

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM01873 12 Relay E-BUS Expansion Module The 12 Relay Expansion Module adds 12 configurable relays to the VCCX2 Control System. It connects to the VCCX2 Controller with an E-BUS cable. Pages 23, 49 ASM02227 ASM01638 ASM01642 ASM01643 Standard Room Sensor – Standard, w/Override, w/ Slide Adjust and w/ Override and Slide Adjust Includes: Standard Room Sensor - Standard, w/Override, w/ Slide Adjust, and w/ Override and Slide Adjust. For wall mounting. Use with VCCX2 Controller only. Connects to controller via field fabricated wiring. TMP GND AUX OUT Page 30 ASM01819 ASM01820 ASM02221 E-BUS Digital Room Sensor - Temp Only and Temp and Humidity The ASM01819 is used with the VCCX2 Controller for room air temperature sensing applications. The ASM01820 and ASM02221 (no LCD display) are used with the VCCX2 Controller for room air temperature and humidity sensing applications. All three use E-BUS cables. Display Override OVERRIDE ALARM Page 27 ASM01829 E-BUS CO2 Wall-Mounted Sensor Used with the VCCX2 Controller for CO2 sensing applications where wall mounting in the space is desired. Connects to the VCCX2 Controller with an E-BUS cable of required length. Cable sold separately. Page 28 ASM01831 E-BUS CO2 Duct-Mounted Sensor with Remote Pickup Tube Used with the VCCX2 Controller for duct mounted CO2 sensing applications. Connects to the VCCX2 Controller with an E-BUS cable of required length. Includes: Duct Mounted CO2 Sensor, Integral Aspiration Box, Airflow Pickup Tube and 10 ft. EBC cable. 4 3 2 1 3M Page 29 ASM01836 E-BUS Horizontal Outdoor Air Temperature and Humidity Sensor Used for outdoor temperature and humidity sensing applications. Connects to VCCX2 Controller or E-BUS Adapter Hub using E-BUS cable. Includes: E-BUS Horizontal Outdoor Air Temperature and Humidity Sensor, mounted in a weatherproof handy box with attached 3 ft. E-BUS cable with jack. A 25 ft. E-BUS cable is included to connect to the VCCX2 Controller. If a longer E-BUS cable is required, it must be ordered separately. 37X04 1.2 1.6 4 3 2 1 3M Page 36 ASM01838 E-BUS Vertical Outdoor Air Temperature and Humidity Sensor Used for outdoor temperature and humidity sensing applications. Connects to VCCX2 Controller or E-BUS Adapter Hub using E-BUS cable. Includes: E-BUS Vertical Outdoor Air Temperature and Humidity Sensor, mounted in a weatherproof handy box with attached 3 ft. E-BUS cable with jack. A 25 ft. E-BUS cable is included to connect to the VCCX2 Controller. If a longer E-BUS cable is required, it must be ordered separately. 37X04 1.2 1.6 4 3 2 1 3M Page 36 OVERVIEW Parts and Descriptions

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM01840 E-BUS Return Air Temperature and Humidity Sensor Used for return air temperature and humidity sensing applications. Connects to VCCX2 Controller or E-BUS Adapter Hub using E-BUS cable. Includes: E-BUS Return Air Temperature and Humidity Sensor, mounted in a weatherproof handy box attached 3 ft. E-BUS cable with jack. A 50 ft. E-BUS cable is included to connect to the VCCX2 Controller. If a longer E-BUS cable is required, it must be ordered separately. 37X04 1.2 1.6 4 3 2 1 3M Page 37 ASM02222 Suction Pressure Transducer Used for suction pressure sensing applications. Connects to the Refrigerant System Modules. Includes: Suction Pressure Transducer and modular cable with a modular connector on one end and bare stripped wires on the other end. Pages 51, 53, 55 G029440 (1.5F) G012870 (3F) G029460 (10F) G045270 (25F) G029510 (50F) GO29530 (75F) G029450 (100F) G029470 (150F) V36590 (250F) G018870 (SPOOL) E-BUS Cables The E-BUS cables connect to the VCCX2 Controller, VCC-X Expansion Modules, and E-BUS Sensors. Different lengths can be joined together using an EBC Adapter Hub, if necessary. The E-BUS cables are available in 1.5, 3, 10, 25, 50, 75, 100, 150, and 250 foot lengths. Includes: E-BUS Cable Assembly. The EBC SPOOL is bulk EBC cable that can be used with the EBC Bulk Connectors. Pages 25-60 G018890 EBC Bulk Connectors Attaches to EBC Spool Cable. Must be crimped using either the G034180 EBC Crimp Tool or one matching the requirements listed in the pricing list. Includes EBC Bulk Connector. N/A G034180 EBC Crimp Tool Crimps the EBC Connectors for use with the EBC Spool Cable. Includes EBC Crimp Tool. N/A G042230 Outdoor Air Temperature Sensor Used for temperature sensing applications. Includes: 10K ohm Outside Air Temperature Sensor, two wire, mounted in a weatherproof handy box only. Page 35 ASM02242 Duct Static Pressure Pick-up Tube Used with the Duct Static Pressure Transducer for static pressure sensing applications. Includes: Static Pressure Pick-up Tube with 1 ft. length of FRP tubing, gasketed mounting bracket, and screws. Page 38 ASM01640 Duct Static Pressure Sensor Used for duct static pressure sensing applications. Includes: 0-5″ W.C., 0-5 VDC, Static Pressure Sensor only. Page 38 ASM01832 Building Static Pressure Sensor Used for Building Pressure Sensing. Includes: -0.25 to +0.25″ W.C., 0-5 VDC, 24 VAC/VDC supply power Building Pressure Sensor only. Page 33 G051240 (6”) G051250 (12”) Duct Temperature Sensor - 6” Probe Duct Temperature Sensor - 12" Probe G051240 = 6″ probe length. G051250 = 12″ probe length. Used for return or Supply Air Temperature sensing applications. Includes: 10K ohm Duct Temperature Sensor, two-wire only. Pages 31 and 32 OVERVIEW Parts and Descriptions

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM01624 Strap-on Temperature Sensor Kit Includes: Type III 10K ohm two-wire Strap-on Temperature Sensor, thermal mastic, and plastic mounting strap. Used for water temperature sensing applications. Pages 43 and 44 ASM01900 System Manager Touch Screen - Limited Access The System Manager Touch Screen - Limited Access (SMTS-L) provides a direct, graphic-enhanced, menu-driven link. The SMTS-L is an end-user interface only and allows the end user to view status points, change Space Setpoints, and view certain alarms of most controllers on the Orion Controls System. The SMTS-L is equipped with a 4.3” 480 x 272 WQVGA RGB TFT LCD Touch Screen Display. The System Manager TS-L is furnished with hardware for flush mounting into hollow drywall or surface mounting on concrete brick or plaster surfaces. Includes: SMTS-L with 12 ft. pigtail cable. See the System Manager TS-L Technical Guide ASM01895 Modular Service Tool SD Includes: Modular Service Tool, power supply, communication cables, 4 GB SD card, and four AA batteries. Used to program and monitor all Orion controllers. Mode Selection STATUS SETPOINTS SCHEDULES OVERRIDES ALARMS CONFIGURATION BALANCE - TEST ON 7 8 0 DEC MINUS 9 4 5 6 1 2 3 ENTER ESC CLLAR DOWN UP PREV NEXT See the VCCX2 Controller Operator Interfaces SD Technical Guide ASM01901 Modular System Manager SD Includes: Modular System Manager SD with 4 GB SD card and 12 ft. pigtail cable assembly. Used to program and monitor all Orion controllers. Designed for hollow core wall mounting. When System Manager is to be mounted on a solid wall (concrete), we recommend you attach the System Manager to a standard handy box. STATUS SETPOINTS SCHEDULES OVERRIDES ALARMS 7 8 0 DEC MINUS 9 4 5 6 1 2 3 ENTER ESC CLLAR DOWN UP PREV NEXT See the VCCX2 Controller Operator Interfaces SD Technical Guide ASM01874 CommLink 5 Communications Interface The CommLink 5 connects to your control system using a USB computer connection to provide direct on-site communications with the control system from a computer with the Prism 2 software installed. For remote communications, see the IP Module Kit. Includes: CommLink 5, 6 ft. USB cable, and 120/24 VAC power supply. Required on all networked systems or if direct computer or remote computer connection is required. Connects to your computer’s USB 1.1 or 2.1 port. Prism 2 computer front-end software must be installed on the direct connected or remote connected computer in order to communicate with your system. See the CommLink 5 Technical Guide ASM01902 IP Module Kit - Internet/LAN Connection Used for Internet or Local Area Network communications with the control system. Field installs by plugging into the CommLink 5 circuit board and provides an addressable Ethernet connection to the controls system from any computer connected to your building’s LAN. It can also be configured to allow access to the control system from the Internet through your LAN if your Ethernet firewall is configured for this option. Includes: IP Link module, 10 ft. long Ethernet cable, and installation instructions. Prism 2 computer front-end software must be installed on the remote computer in order to dial-up and communicate with the controls system. See the IP Module Technical Guide OVERVIEW Parts and Descriptions

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM02244 USB-Link 2 Kit The USB-Link 2 is a pocket-sized communications interface used to connect a laptop computer to your controls system for programming and monitoring purposes, utilizing a modular cable to allow connection to the service port connector on the controllers and a USB cable to connect to a laptop computer. Includes: USB-Link 2 for multiple or single loop systems, USB cable, modular connection cable, two mini-DIN to terminal adapters, and Prism 2 software. See the USB-Link 2 Technical Guide ASM01626 MiniLink PD 5 Used with all Orion controllers to provide network communications, zone voting, alarming, and tenant logging capabilities. A MiniLink Polling Device is required on each loop of a networked system. Includes: MiniLink Polling Device 5. See the Orion MiniLink PD 5 Technical Guide ASM02533 Prism 2 Front-End Computer Software Prism 2 provides standard, easy to understand status screens for each type of VCCX2 equipment installed. Prism 2 software has provisions for custom screens which allow floor plans, equipment photos, or user-defined summary screens to be implemented to meet their own individual needs. All controlling setpoints, trend logs, and alarm conditions are accessed in the Prism environment. Prism can be configured for direct on-site installation, remote modem connection, or TCP/IP Internet connection to several installations. Page 64 ASM01878 E-BUS Adapter Board The E-BUS Adapter Board is used for connecting the EBTRON®, GreenTrolTM, or Paragon Airflow Measurement Digital Transmitter to the VCCX2 Controller. The E-BUS Adapter Board connects to the VCCX2 Controller with an E-BUS cable. Cable supplied separately. Page 50 G033970 E-BUS Adapter Hub The E-BUS Adapter Hub is used for connecting E-BUS devices and controllers together with E-BUS cables of varying lengths. Includes: E-BUS Adapter Hub. Pages 36 and 37 ASM01635 E-BUS Adapter Hub with 1.5 ft. E-BUS Cable The E-BUS Adapter Hub is used for connecting E-BUS devices and controllers together with E-BUS cables of varying lengths. Includes: E-BUS Adapter Hub and 1.5 ft. E-BUS cable. Pages 36 and 37 ASM01696 E-BUS Space Temperature and Humidity Sensor Emulator Board with 1.5 ft. E-BUS Cable The E-BUS Space Temperature and Humidity Sensor Emulator Board allows the use of third-party analog space temperature and humidity sensors to emulate the AAON E-BUS combination Space Temperature and Humidity Sensor. Includes: E-BUS Sensor Emulator Board and 1.5 ft. E-BUS cable. SENSOR EMULATION BOARD E-BUS RETURN AIR TEMP/HUMIDITY OE365-04-EBSE N/A ASM01621 E-BUS Return Air Temperature and Humidity Sensor Emulator Board with 1.5 ft. E-BUS Cable The E-BUS Return Air Temperature and Humidity Sensor Emulator Board allows the use of third-party analog return air temperature and humidity sensors to emulate the AAON E-BUS combination Return Air Temperature and Humidity Sensor. Includes: E-BUS Sensor Emulator Board and 1.5 ft. E-BUS cable. E-BUS SPACE TEMP/HUMIDITY SENSOR EMULATION BOARD OE365-03-EBSE N/A OVERVIEW Parts and Descriptions

PART NO. PART DESCRIPTION ILLUSTRATION PAGE NO. ASM01697 E-BUS Outdoor Air Temperature and Humidity Sensor Emulator Board with 1.5 ft. E-BUS Cable The E-BUS Outdoor Air Temperature and Humidity Sensor Emulator Board allows the use of third-party analog outdoor air temperature and humidity sensors to emulate the AAON E-BUS combination Outdoor Air Temperature and Humidity Sensor. Includes: E-BUS Sensor Emulator Board and 1.5 ft. E-BUS cable. E-BUS RETURN AIR CO2 SENSOR EMULATION BOARD OE365-07-EBSE N/A ASM01622 E-BUS Space CO2 Sensor Emulator Board with 1.5 ft. E-BUS Cable The E-BUS Space CO2 Sensor Emulator Board allows the use of a third-party analog CO2 sensor to emulate the AAON E-BUS Wall-Mounted Space CO2 Sensor. Includes: E-BUS Sensor Emulator Board and 1.5 ft. E-BUS cable. E-BUS RETURN AIR CO2 SENSOR EMULATION BOARD OE365-07-EBSE N/A ASM01623 E-BUS Return Air CO2 Sensor Emulator Board with 1.5 ft. E-BUS Cable The E-BUS Return Air CO2 Sensor Emulator Board allows the use of a third-party analog CO2 sensor to emulate the AAON E-BUS Duct-Mounted CO2 Sensor. Includes: E-BUS Sensor Emulator Board and 1.5 ft. E-BUS cable. E-BUS RETURN AIR CO2 SENSOR EMULATION BOARD OE365-07-EBSE N/A ASM01907 Communication Surge Protector Kit Used to isolate power surges to the communications wiring caused by lightning strikes for communications wiring loops that are routed outdoors or between buildings. One kit is required at each point where the communications wiring leaves or enters a building. Includes: Communication Bus Surge Protector, Base Module, and Mounting/Wiring Instructions. N/A ASM01868 GPC-XP Controller The GPC-XP Controller is used for controlling equipment or processes that cannot be controlled using a standard HVAC controller. Prism 2 computer front end software is used to interface with the GPC-XP Controller functions. The GPC-XP Controller provides the flexibility to control, schedule, and/or monitor equipment such as unit heaters, exhaust fans, motorized louvers, and other mechanical equipment. In addition, the GPC-XP provides Lead/Lag start capabilities. The GPC-XP has eight configurable analog inputs which will accept signals from thermistor temperature sensors, 4-20 mA or 0-5 VDC or 0-10 VDC transmitters. Custom formulas created by available math functions and operators can be used in conjunction with the analog inputs to create a calculated value to be used and displayed for a specific analog input. The inputs are set for the desired scaling by means of a jumper bar. An additional input is available for communicating sensors available from AAON Controls. The GPC-XP also supports eight wet contact binary inputs which can be configured for either normally open or normally closed operation. The GPC-XP has eight relay outputs for on/off control and four analog outputs for proportional control signals. Highest/lowest/average of the analog input values can be used in the GPC-XP logic or broadcast to other controllers on the control system loop. The GPC- XP also has eight separate schedules which can be assigned to any input or output for operational control or alarm recognition based on time of day. These schedules can also be configured to broadcast to other AAON HVAC equipment installed on the control system loop. Includes: GPC-XP Controller. See the GPC-XP Controller Technical Guide OVERVIEW Parts and Descriptions

Figure 1: VCCX2 Controller Components OVERVIEW VCCX2 Controller Components

Figure 2: VCCX2 Controller Dimensions DIMENSIONS VCCX2 Controller 4.10 0.70 7.95 8.38 0.213 2.75 6.04 Note: All Dimensions are in inches. Note: Depth is 1.50 inches.

Figure 3: Typical Refrigerant System Module Dimensions (RSMV Shown) DIMENSIONS Refrigerant System Module (RSM) AAON P/N: ASM01686 +24 VAC GND RELAY CONTACT RATING IS 1 AMP MAX @ 24 VAC CONDENSER COMP 1 COMP 2 ANALOG OUTPUTS COMMON RELAY OUTPUTS LABEL P/N: G042020 MOD COMP SIG CONDENSER FAN SIG GND 24 VAC POWER ONLY WARNING! POLARITY MUST BE OBSERVED OR THE CONTROLLER WILL BE DAMAGED NOT USED +5 V +5 V COIL TEMP 1 COMP STATUS 1 SP HP COIL TEMP 2 COMP STATUS 2 GND GND NOT USED NOT USED GND TEMP 3 GND COIL TEMP SENSORS BINARY INPUTS E-BUS RSM FOR VFD COMPRESSORS www.aaon.com SUCTION PRESSURE SENSOR HEAD PRESSURE SENSOR E-BUS EXPANSION VALVE 1 EXPANSION VALVE 2 WHITE BLACK RED GREEN WHITE BLACK RED GREEN ALARM UP DOWN ENTER MENU 5.00 0.20 0.57 2.05 4.10 5.63 5.24 2.62 5.73 Note: All Dimensions are in inches. Note: Depth is 1.50 inches.

5. VREF BIN3 BIN2 BIN1 2 1 ON ADDRESS BINARY INPUTS PRESSURE SENSOR INPUTS GND GND +5V SIG2 SIG1 TEMP SENSOR INPUTS GND GND T2 T1 STATIC PRESSURE TB1 R58 J2 D29 D28 D27 TB2 P1 D26 D25 D24 TB7 R22 R21 R19 R18 R16 R15 R1 R1 R10 R6 R3 R1 D18 D15 D12 D8 D4 D1 C8 C6 C5 C4 C3 C2 COMM STAT ALARM PWR PWM- GND R5 R4 R3 R2 R1 SERIAL # TB3 TB9 TB6 R61 R57 R56 R54 R53 R49 R48 R46 R45 Q6 D21 D20 D19 D17 C24 2 1 Rc R35 R31 R29 R24 D13 D11 D10 D9 PWM+ R9 AOUT1 AOUT2 AOUT3 AOUT4 5621 OFF 1002 1002 1002 1002 1002 1002 47 4992 1002 1004 1002 1002 1004 1002 300 300 10uF 10uF 10uF 10uF 10uF 10uF .01uF 10uF 300 1002 1002 3650 R4 1002 R5 1002 J1 C26 OPTIONS R2 47 47 1001 1001 3650 3650 3650 5621 5621 5621 5621 YS102482 REV1 5.63 5.00 2.67 0.62 2.05 4.10 0.20 5.83 5.34 Note: All Dimensions are in inches. Note: Depth is 1.50 inches. EXH. DAMPER Figure 4: VCC-X EM1 Expansion Module Dimensions DIMENSIONS VCC-X EM1 Expansion Module

COMM 8 4 2 1 ADD ADDRESS SERIAL # POWER C213 R211 R212 R214 C214 R213 TB10 SW1 R44 R43 R42 R41 J1 R40 D6 TB3 TB2 TB1 R8 D3 RLY9 RLY10 RLY11 RLY12 RLY-COM MADE IN USA RLY-COM RLY-COM RLY1 RLY2 RLY3 RLY4 RLY8 RLY7 RLY6 RLY5 24VAC GND EXPANSION BOARD YS102324 REV 2 RELAY 1002 1002 1002 1002 1002 1002 OFF .1uF 1000pF 5.00 0.20 5.63 6.06 2.76 5.52 2.05 0.71 4.10 Note: All Dimensions are in inches. Note: Depth is 1.50 inches. Figure 5: 12 Relay E-BUS Module Dimensions DIMENSIONS 12 Relay E-BUS Module

General Correct wiring of the VCCX2 Controller is the most important factor in the overall success of the controller installation process. In general, most VCCX2 Controllers are factory installed and wired at the AAON® factory. It is also possible to purchase these controllers through your local AAON® representative for installation in the field. Some of the following information pertains to field wiring and may not apply to your installation if it was pre-wired at the factory. However, if troubleshooting of the controller is required, it is a good idea to be familiar with the system wiring, no matter if it was factory or field wired. Controller Mounting When the controller is to be field mounted, it is important to mount the controller in a location that is free from extreme high or low temperatures, moisture, dust, and dirt. See Table 1, this page for a list of the required operating conditions for the VCCX2 Controller and associated expansion modules. The VCCX2 Controller is housed in a plastic enclosure. It is designed to be mounted by using the three mounting holes in the enclosure base. The VCCX2 Controller needs to be installed in an environment which can maintain a temperature range between -22°F and 158°F not to exceed 95% RH levels (non- condensing). Be careful not to damage the electronic components when mounting the controller. Wiring The VCCX2 Controller and expansion modules must be connected to a 24 VAC power source of the proper size for the calculated VA load requirements. All transformer sizing should be based on the VA rating listed in Table 1, this page. Please carefully read and apply the following information when wiring the VCCX2 Controller, RSMs, and Expansion Modules. 1. All wiring is to be in accordance with local and national electrical codes and specifications. 2. All 24 VAC wiring must be connected so that all ground wires remain common. Failure to follow this procedure can result in damage to the controller and connected devices. 3. Minimum wire size for 24 VAC wiring should be 18-gauge. 4. Minimum wire size for all sensors should be 24-gauge. Some sensors require two-conductor wire and some require three-or four-conductor wire. 5. Minimum wire size for 24 VAC thermostat wiring should be 22-gauge. 6. Be sure that all wiring connections are properly inserted and tightened into the terminal blocks. Do not allow wire strands to stick out and touch adjoining terminals which could potentially cause a short circuit. 7. When communication wiring is to be used to interconnect VCCX2 Controllers together or to connect to other communication devices, all wiring must be plenum-rated, minimum 18-gauge, two- conductor, twisted pair with shield. AAON can supply communication wire that meets this specification and is color coded for the network or local loop. Please consult your AAON distributor for information. If desired, Belden #82760 or equivalent wire may also be used. 8. Before applying power to the VCCX2 Controller, be sure to recheck all wiring connections and terminations thoroughly. Powering Up When the VCCX2 and connected modules are first powered up, the POWER LED should light up and stay on continuously. If it does not light up, check to be sure that you have 24 VAC connected to the controller, that the wiring connections are tight, and that they are wired for the correct polarity. The 24 VAC power must be connected so that all ground wires remain common. If after making all these checks, the POWER LED does not light up, please contact AAON Controls Support for assistance. Control Device Voltage VA Load Temperature Humidity (Non- Condensing) VCCX2 Controller 18-30 VAC 15 -22°F to 158°F 0-95% RH RSMD, RSMV, RSMV-HP, RSMZ Refrigerant System Modules and Subcool Monitor 18-30 VAC 18 -22°F to 158°F 0-95% RH VCCX EM1 Expansion Module 18-30 VAC 5 -22°F to 158°F 0-95% RH 12 Relay E-BUS Expansion Module 18-30 VAC 15 -22°F to 158°F 0-95% RH Table 1: Voltage and Environment Requirements WARNING: When using a single transformer to power multiple controllers or expansion modules, the correct polarity must always be maintained between the boards. Failure to observe correct polarity will result in damage to the controller and expansion modules. WIRING Important Wiring Considerations

VCCX2 Controller Inputs The VCCX2 Controller is designed with eight analog inputs, four analog outputs, eight binary inputs and eight relay outputs. There are also two E-BUS Expansion Ports which allow the use of communicating sensors and E-BUS Modules. See Figure 6, this page and Figure 7, page 26 for wiring details. Detailed wiring for all inputs and outputs are found on the pages that follow. Note: Either a flush mount room sensor or a digital E-BUS room sensor (using a modular E-BUS cable) may be used. Proof of Flow Switch Dirty Filter Switch Hood ON/OFF Remote Forced Occupied Remote Forced Cooling Remote Forced Heating Remote Forced Dehumidification Emergency Shutdown Switch Supply Air Temp. Sensor Mount in HVAC unit supply air stream Space Temperature Sensor GND AUX TEMP Return Air Temp. Sensor Mount in HVAC unit return air stream Outdoor Air Temperature Sensor Building Static Pressure Sensor Plastic tubing to building pressure sensing locations Remote Supply Air Temperature Reset Signal (configurable 0-10VDC) (by others) EXC OUT COM Connect FRP Tubing to High Pressure Port (bottom tube) and route to Static Pressure Pickup Probe located in unit discharge. Leave port marked “LO” open to atmosphere. Static Pressure Transducer Plug into VCCX2 Controller’s Duct Static Port 18-30 VAC GND Line Figure 6: VCCX2 Controller Input Wiring WIRING VCCX2 Controller Inputs

Note: All Relay Outputs are normally open and rated for 24 VAC power only. 1 amp maximum load Waterside Economizer Valve Figure 7: VCCX2 Controller Output Wiring WIRING VCCX2 Controller Outputs

E-BUS Digital Room Sensor The ASM01819 E-BUS Digital Room Temperature Sensor can be used to monitor space temperature. The ASM01820 or ASM02221 E-BUS Digital Room Temperature Sensor can be used to sense space temperature and humidity. The ASM02221 has no LCD display or keypad. The sensor connects to the VCCX2 Controller with the E-BUS cable. It can also be daisy- chained with a CO2 sensor for applications requiring both a wall-mounted CO2 sensor and one of the three Digital Room Temperature sensors. The E-BUS Digital Room Sensor should be mounted on the wall in an area that does not have drafts or is exposed to direct sunlight. See Figure 8, this page for wiring details. NOTE: If using multiple E-BUS sensors or modules, the E-BUS Hub or Adapter Board may be required. E-BUS cable VCCX2 Controller Figure 8: E-BUS Digital Room Sensor Wiring WIRING E-BUS Digital Room Sensor

Wall-Mounted E-BUS CO2 Sensor The ASM01829 Wall-Mounted E-BUS CO2 Sensor is used to monitor CO2 levels in the space served by the HVAC unit. The E-BUS CO2 Sensor connects to the VCCX2 Controller with an E-BUS cable. It can be daisy-chained with the E-BUS Digital Room Sensor for applications requiring both a room CO2 sensor and room temperature sensor. It should be mounted on the wall in an area that does not have drafts or is exposed to direct sunlight. See Figure 9, this page for wiring details and installation notes. A Duct-Mounted E-BUS CO2 Sensor can be used if desired instead of the E-BUS CO2 Wall-Mounted Sensor. See Figure 10, page 29 for Duct-Mounted E-BUS CO2 Sensor wiring details. NOTE: If using multiple E-BUS sensors or modules, the E-BUS Hub or Adapter Board may be required. ASM01829 Wall-Mounted E-BUS CO Sensor 2 Figure 9: Wall-Mounted E-BUS CO2 Sensor Wiring WIRING Wall-Mounted E-BUS CO2 Sensor

Duct-Mounted E-BUS CO2 Sensor The ASM01831 Duct-Mounted E-BUS CO2 Sensor with Remote Pickup Tube is used for sensing the current CO2 level in the HVAC unit’s return air stream. This is useful when you want a CO2 reading in the area served by the HVAC unit or when you don’t want a Wall-Mounted E-BUS CO2 Sensor due to sensor tampering concerns in the space. The Duct-Mounted E-BUS CO2 Sensor is comprised of the CO2 Sensor, the AAON Aspiration Box Assembly, and a Remote Pickup Tube. The Duct-Mounted E-BUS CO2 Sensor with Remote Pickup Tube is designed to be mounted in the return air duct of the HVAC unit and uses its integral aspiration box to sample the CO2 level in the duct. See Figure 10, this page for wiring and installation details. NOTE: If using multiple E-BUS sensors or modules, the E-BUS Hub or Adapter Board may be required. Note: The Duct-Mounted E-BUS CO Sensor connects to the VCCX2 Controller using an E-BUS cable of the required length or the provided 10 ft. E-BUS cable. 2 10 ft. E-BUS cable (provided) E-BUS cable with jack connection ASM01831 Duct-Mounted E-BUS CO Sensor 2 Figure 10: Duct-Mounted E-BUS CO2 Sensor Wiring WIRING Duct-Mounted E-BUS CO2 Sensor

Space Temperature Sensor The ASM02227, ASM01638, ASM01642, ASM01643 Space Temperature Sensor is typically used for constant volume HVAC unit applications controlling one zone. The Space Temperature Sensor is a 10K Type III thermistor sensor and should be mounted approximately five feet above the floor in the space that is to be controlled. The Space Temperature Sensor is available as a sensor only, sensor with override button, sensor with slide adjust, and sensor with slide adjust and override configurations. A Space Temperature Signal can be connected to AI1 for applications requiring a Space Temperature Setpoint. See Figure 11, this page for complete Space Temperature Sensor wiring details. Space Temperature Sensor (ASM01643 shown) Figure 11: Space Temperature Sensor Wiring and Slide Adjust WIRING Space Temperature Sensor

Supply Air Temperature Sensor The G051240 (6 inch) or G051250 (12 inch) Supply Air Temperature Sensor must be wired as shown for proper operation. The Supply Air Temperature Sensor is a 10K Type III thermistor sensor. The Supply Air Temperature Sensor should be mounted in the unit discharge plenum or in the supply air duct. A Supply Air Temperature Signal can be connected to AI3 for applications requiring a Supply Air Temperature Setpoint. See Figure 12, this page for details. Figure 12: Supply Air Temperature Sensor Wiring WIRING Supply Air Temperature Sensor

Return Air Temperature Sensor G051240 (6 inch) or G051250 (12 inch) Return Air Temperature Sensor must be wired as shown for proper operation. The Return Air Temperature Sensor is a 10K Type III thermistor sensor. The Return Air Temperature Sensor should be mounted in the return air duct. If the system has a Zoning Bypass Damper installed, be sure the return air sensor is located upstream of the bypass duct connection. A Return Air Temperature Signal can be connected to AI4 for applications requiring a Return Air Temperature Setpoint. See Figure 13, this page for details. Figure 13: Return Air Temperature Sensor Wiring WIRING Return Air Temperature Sensor

Building Pressure Sensor The ASM01832 Building Static Pressure Sensor must be wired as shown in Figure 14, this page. There are three terminal connections on the Building Pressure Sensor. Connect the power side of the 24 VAC power source to the terminal labeled “+ EXC.” Connect the GND side of the 24 VAC power source to the terminal labeled “- COM.” Connect the remaining terminal labeled “OUT” to AI5 on the VCCX2 Controller. WARNING: It is very important to be certain that all wiring is correct as shown in the wiring diagram below. Failure to observe the correct polarity will result in damage to the VCCX2 Controller or Building Pressure Sensor. Figure 14: Building Pressure Sensor Wiring WIRING Building Pressure Sensor

Remote SAT Reset Signal A Remote Supply Air Temperature Reset Signal can be connected to AI6 for applications requiring Remote Reset of the Supply Air Temperature Setpoint. See Figure 15, this page. Figure 15: Remote SAT Reset Signal Wiring WIRING Remote SAT Reset

Outdoor Air Temperature Sensor The G042330 Outdoor Air Temperature Sensor must be wired as shown for proper operation of the VCCX2 Controller. The Outdoor Air Temperature Sensor is a 10K Type III thermistor sensor. A Outdoor Air Temperature Signal can be connected to AI7 for applications requiring an Outdoor Air Temperature Setpoint. See Figure 16, this page for details. For applications involving Outdoor Air Humidity, the vertical or horizontal E-BUS Outside Air and Humidity Sensor must be used instead. See Figure 17, page 36 for details. CAUTION: Be sure to mount the Outdoor Air Temperature Sensor in the upright position, in an area that is not exposed to direct sunlight, and is protected from the elements. The shaded area under the HVAC unit rain hood is normally a good location. Unused conduit opening(s) must have closure plugs installed and must be coated with sealing compound to provide a rain-tight seal. Water can damage the sensor. Figure 16: Outdoor Air Temperature Sensor Wiring WIRING E-BUS Outdoor Air Temperature Sensor

E-BUS Horizontal or Vertical Outdoor Air Temperature and Humidity Sensor The ASM01836 (Horizontal) or ASM01838 (Vertical) E-BUS Outdoor Air Temperature and Humidity Sensor connects to the VCCX2 Controller. A 25 ft. E-BUS cable (provided) plugs into the sensor’s attached 3 ft. cable and then plugs into the E-BUS port of the VCCX2 Controller or other E-BUS Expansion Board. See Figure 17, this page for details. CAUTION: Be sure to mount the Outdoor Air Temperature Sensor in the upright position, in an area that is not exposed to direct sunlight, and is protected from the elements. The shaded area under the HVAC unit rain hood is normally a good location. Unused conduit opening(s) must have closure plugs installed and must be coated with sealing compound to provide a rain-tight seal. Water can damage the sensor. NOTE: If using multiple E-BUS Sensors or Modules, the E-BUS Hub (ASM01635 or G033970) or E-BUS Adapter Board (ASM01878) may be required. 25 ft. E-BUS cable (provided) Note: Connect the sensor to the VCCX2 Controller using the provided E-BUS cable. Figure 17: E-BUS Outdoor Air Temperature and Humidity Sensor Wiring WIRING E-BUS Outdoor Air Temperature and Humidity Sensor

E-BUS Return Air Temperature and Humidity Sensor The ASM01840 E-BUS Return Air Temperature and Humidity Sensor connects to the VCCX2 Controller. A 50 ft. E-BUS cable (provided) plugs into the sensor’s attached 3 ft. cable and then plugs into the E-BUS port of the VCCX2 Controller or other E-BUS expansion board. The sensor should be mounted in the upright position as shown in an area that is protected from the elements and direct sunlight. See Figure 18, this page for details. Figure 18: E-BUS Return Air Temperature and Humidity Sensor Wiring 50 ft. E-BUS cable (provided) Note: Connect the sensor to the VCCX2 Controller using the provided E-BUS cable. WIRING E-BUS Return Air Temperature and Humidity Sensor CAUTION: Be sure to mount the Outdoor Air Temperature Sensor in the upright position, in an area that is not exposed to direct sunlight, and is protected from the elements. The shaded area under the HVAC unit rain hood is normally a good location. Unused conduit opening(s) must have closure plugs installed and must be coated with sealing compound to provide a rain-tight seal. Water can damage the sensor. NOTE: If using multiple E-BUS Sensors or Modules, the E-BUS Hub (ASM01635 or G033970) or E-BUS Adapter Board (ASM01878) may be required.

Duct Static Pressure Transducer The ASM01640 Duct Static Pressure Transducer plugs directly into the VCCX2 Controller’s Static Pressure Port. The Duct Static Pressure Sensor reading is used to determine current Duct Static Pressure. This static pressure reading is used to control the output signal supplied to the Supply Fan VFD, Zone Damper Actuator or Bypass Damper Actuator. If you have configured the HVAC unit for constant volume operation, this sensor is optional. If it is installed on a constant volume unit, it will not affect operation, but rather will be used as a status-only reading. See Figure 19, this page for detailed wiring. CAUTION: It is strongly recommended that you use pneumatic tubing instead of relocating the sensor. Extending the wires could cause voltage drop problems. Duct Static Pressure Transducer Figure 19: Static Pressure Transducer Wiring WIRING Duct Static Pressure Transducer

Note: Wire to the VFD using 10 gauge minimum two-conductor twisted pair with shield cable. Wire shield to GND as shown. Belimo Actuator wiring shown. Consult factory for other manufacturer wiring instructions. SHLD Supply Fan VFD Signal or Bypass Damper Actuator The Supply Fan VFD Signal is a user-adjustable signal with a range of 0-10 VDC from AO1 on the VCCX2 Controller. This signal output can be connected to either: • The Supply Fan VFD to modulate the supply fan speed. • A bypass damper for zoning applications. See Figure 20, this page for detailed wiring. CAUTION: VFD units can cause large transient noise spikes which can cause interference to be propagated on other electronic equipment. Use shielded wire wherever possible and route all sensor and controller wiring away from the VFD and the HVAC unit electrical wiring. Figure 20: Supply Fan VFD Wiring WIRING Supply Fan VFD or Bypass Damper Actuator

Note: For WSE Bypass Valve wiring, see the . RSMD Technical Guide Waterside Economizer Valve Economizer Damper Actuator The Economizer Damper Actuator signal voltage output (using AO2) is user-adjustable, but must be set to 2-10 VDC for this application. This signal output is used by the VCCX2 Controller to modulate the Economizer Damper Actuator in order to control the amount of outdoor air delivered to the HVAC unit for free cooling and/or indoor air quality requirements. See Figure 21, this page for detailed wiring. WARNING: It is important to be certain that all wiring is correct as shown in the wiring diagram below. Failure to observe the correct polarity will result in damage to the actuator or VCCX2 Controller. Waterside Economizer (WSE) Valve The WSE valve must be wired as shown in Figure 21, this page for proper operation. The WSE valve connects to AO2 on the VCCX2 Controller. Waterside Economizer (WSE) Bypass Valve The WSE valve must be wired to AO2 on the Refrigeration System Module for Digital Compressors (RSMD). See the RSMD Technical Guide for more information. Figure 21: Economizer Damper Actuator or WSE Valve Actuator Wiring WIRING Economizer Actuator or WSE Actuator

Modulating Heating Device The Modulating Heating Device signal voltage output is a user- adjustable signal with a range of 0-10 VDC from AO3 when programming the controller. The output signal can be configured for either direct acting or reverse acting operation as required. The output signal is normally used to control a Modulating Hot Water Valve or Modulating Steam Valve or is used for SCR Control of an Electric Heating Coil. See Figure 22, this page for detailed wiring of the Modulating Heating Device. WARNING: It is very important to be certain that all wiring is correct as shown in the wiring diagram below. Failure to observe the correct polarity could result in damage to the Modulating Heating Device or the VCCX2 Controller. (1-10 VDC) Note: If the modulating heating device needs a relay signal to activate, this can be configured when setting up the VCCX2 Controller. Figure 22: Modulating Heating Device Wiring WIRING Modulating Heating Device

Building Pressure Control Output The Building Pressure Control Output is a 0-10 VDC or 2-10 VDC signal sent from the VCCX2 Controller. When using the output for direct building pressure control (output signal rises on a rise in building pressure), the output signal can be connected to either a Variable Frequency Drive (VFD) controlling an exhaust fan or to a damper actuator controlling an exhaust damper (both by others). When used in this manner, the output signal must be configured for direct acting operation. See Figure 23, this page for detailed wiring of the Building Pressure Control Output Signal. When using this output for Reverse Building Pressure Control (output signal rises on a fall in building pressure), a damper actuator controlling an OA damper or supply fan VFD would be used. When using the OA damper for Reverse Building Pressure Control, the output signal must be configured for reverse acting operation. A building pressure sensor connected to AI5 on the VCCX2 Controller is used to sense and control the signal to the building pressure output. The Building Static Pressure Sensor must be connected in order for the building pressure output to operate correctly. CAUTION: VFD units can cause large transient noise spikes that can cause interference to be propagated on other electronic equipment. Use shielded wire wherever possible and route all sensor and controller wiring away from the VFD and the HVAC unit electrical wiring. Note: Both types of building pressure control are shown. Only one type of building pressure control device may be used on each HVAC unit. VCCX2 Controller Building Pressure Control Damper Actuator (by others - Belimo Actuator Shown) Note: Belimo Actuator wiring showing. Consult factory for other manufacturer wiring instructions. Caution: The VFD unit must be configured for 0-10 VDC input. The input resistance at the VFD must not be less than 1k ohms when measured at the VFD terminals with all input wires removed. (by others) Building Pressure Control Exhaust Fan VFD Note: Wire to the VFD using 18 gauge minimum two- conductor twisted pair with shield cable. Wire shield to GND as shown. Shield Size transformer for correct total load. VCCX2 Controller = 15 VA 0-10 VDC input from AO4 Figure 23: Building Pressure Control Output Wiring WIRING Building Pressure Control Outputs

VCC-X EM1 Expansion Module The VCC-X EM1 Expansion Module connects to the VCCX2 Controller with an E-BUS cable and adds an additional: five analog inputs, five analog outputs, three binary inputs, and five configurable relay outputs. The VCC-X EM1 Expansion Module can be used in conjunction with the E-BUS 12 Relay Expansion Module. The expansion modules can be used individually or together to provide the required inputs and outputs for your specific applications. Entering Water Temperature Sensor The Entering Water Temperature Sensor is a 10K ohm Type III thermistor sensor. The Entering Water Temperature Sensor should be mounted in the entering water piping. Return Air Plenum Pressure Sensor The ASM01832 Return Air Plenum Pressure Sensor (also used as a Building Static Pressure Sensor, as shown on page 33) must be wired as shown in Figure 24, this page. There are three terminal connections on the Pressure Sensor. Connect 24 VAC to the terminal labeled “+ EXC.” Connect the GND terminal on the EM1 Expansion Module terminal block to the terminal labeled “- COM.” Connect the remaining terminal labeled “OUT” to SIG1 on the EM1. + EXC - COM Tubing to RA plenum pressure sensing location Tubing to atmospheric sensing location Return/Exhaust Proof of Flow Switch Connect to VCCX2 Controller Connect to Expansion Module(s) (when used) Figure 24: Entering Water Temperature Sensor, Return Air Plenum Pressure and Return/Exhaust Proof of Flow WIRING Entering Water Temp Sensor, RA Plenum, and Return/Exhaust Proof of Flow WARNING: It is very important to be certain that all wiring is correct as shown in the wiring diagram below. Failure to observe the correct polarity will result in damage to the VCCX2 Controller or Return Air Plenum Pressure Sensor.

Secure sensor element and thermal mastic strip to pipe with supplied wire tie. Be sure to tighten wire tie snugly to ensure good thermal contact. Figure 25: Entering Water Temperature Sensor WIRING VCC-X EM1 Entering Water Temperature Sensor

WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module. Caution: It is strongly recommended that you use pneumatic tubing instead of relocating the sensor. Extending the wires could cause voltage drop problems. ASM01640 Exhaust Static Pressure Sensor Set jumper to 0-10 V (by others) Belimo Actuator wiring shown. Consult factory for other manufacturer wiring instructions. Economizer Damper Actuator (Belimo Actuator shown) Connect to Expansion Module(s) (when used) Exhaust Duct Static Pressure Sensor The ASM01640 Static Pressure Sensor plugs directly into the EM1’s Static Pressure port. The Duct Static Pressure Sensor reading is used to determine current Exhaust Duct Static Pressure. This Static Pressure reading is used to control the output signal (AO4 on the VCCX2 Controller) supplied to the Exhaust Fan VFD. See Figure 26, this page for wiring. Title 24 Economizer Actuator Feedback If the controller has been configured for Title 24 Economizer operation, the Economizer Actuator Feedback signal will be wired to the VCC-X EM1’s SIG3 input. The jumper should be set to 0-10 V. See Figure 26, this page for wiring. Figure 26: VCC-X EM1 Exhaust Duct Static Pressure and Economizer Actuator Feedback Wiring WIRING VCC-X EM1 Expansion Module Inputs

VCC-X EM1 Expansion Module Outputs The VCC-X EM1 Expansion Module must be connected to 24 VAC as shown in the wiring diagram below. Please see Table 1, page 24 for correct VA requirements to use when sizing the transformer(s) used for powering the expansion module. Also, please note that when wiring the VCC-X EM1 Expansion Module, its contacts must be wired as wet contacts (connected to 24 VAC). See Figure 27, this page for output wiring. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module. (for Return Plenum Pressure Control Applications) Belimo Actuator wiring shown. Consult factory for other manufacturer wiring instructions. 1 amp maximum load. Figure 27: VCC-X EM1 Expansion Module Output Wiring WIRING VCC-X EM1 Expansion Module Outputs

Modulating Cooling Output This output is used to control a Modulating Chilled Water Valve to maintain the Cooling Supply Air Temperature Setpoint. The output is configured for 2-10 VDC direct acting operation. See Figure 28, this page for wiring details. +24 VAC GND RELAY CONTACT RATING IS 1 AMP MAX @ 24 VAC R1 R2 R3 R4 R5 RELAY OUTPUT TERMINALS ANALOG OUTPUT TERMINALS GND NOT USED NOT USED RETURN DAMPER RETURN BYPASS CHILLEDWATER EXH. DAMPER E-BUS CONNECT 24 VAC POWER ONLY WARNING! POLARITY POWER INPUT TERMINAL BLOCK VCC-X E EXPANSION M1 AAON P/N: ASM01691 LABEL P/N: G040660 RC 2 + Y1 3 COM 1 VCC-X EM1 Expansion Module 18-30 VAC GND Line Voltage Chilled Water Valve Actuator VCC-X E 1 Module = 5 VA M correct total load. Size transformer for Figure 28: Chilled Water Valve Actuator Wiring WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module. WIRING Chilled Water Valve Actuator

Return Air Bypass The VCCX2 Controller can be configured for AAON® Return Air Bypass applications. These provide improved moisture removal capabilities while utilizing internal space loads for reheat by redirecting Return Air around the Evaporator Coil instead of through the coil. See the AAON® Return Air Bypass application section of this manual on page 10 for complete operation details. The AAON® Return Air Bypass applications utilize a Return Air Bypass Damper Actuator and a Return Air Damper Actuator to modulate the Return Air and Return Air Bypass Dampers to control the amount of air that is redirected around the Evaporator Coil. The output is configured for 2-10 VDC direct acting operation. See Figure 29, this page for detailed wiring of the Return Air Bypass and Return Air Damper Actuators. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module. Figure 29: Return Air Bypass Wiring +24 VAC GND RELAY CONTACT RATING IS 1 AMP MAX @ 24 VAC R1 R2 R3 R4 R5 RELAY OUTPUT TERMINALS ANALOG OUTPUT TERMINALS GND NOT USED NOT USED RETURN DAMPER RETURN BYPASS CHILLED WATER EXH. DAMPER E-BUS CONNECT 24 VAC POWER ONLY WARNING! POLARITY POWER INPUT TERMINALBLOCK VCC-X E EXPANSION M1 AAON P/N: ASM01691 LABEL P/N: G040660 RC VCC-X EM1 Expansion Module 18-30 VAC GND Line Voltage Size transformer for correct total load. VCC-X E 1 Module = 5 VA M 2 + Y1 3 COM 1 2 + Y1 3 COM 1 BelimoActuator wiring shown. Consult factory for other manufacturer wiring instructions. Damper Actuator Return Air Return Air Bypass Damper Actuator WIRING Return Air Bypass

12 Relay E-BUS Expansion Module The ASM01873 12 Relay E-BUS Expansion Module provides for 12 Dry Contact Configurable Relay Outputs. See Figure 30, this page for complete wiring details. The 12 Relay E-BUS Expansion Module can be used in conjunction with the VCC-X EM1 Expansion Module. The expansion modules can be used individually or together to provide the required inputs and outputs for your specific applications. The expansion modules can be used individually or together to provide the required inputs and outputs for your specific applications. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module. 12 Relay E-BUS Expansion Module E-BUS cable connects to VCCX2 Controller E-BUS cable connects to the next Expansion Board Figure 30: 12 Relay E-BUS Expansion Module Wiring WIRING 12 Relay E-BUS Expansion Module

EBTRON®, GreenTrolTM, and Paragon Airflow Measurement Digital Transmitters The E-BUS Adapter Board attaches to the VCCX2 Controller with an E-BUS cable. The Adapter Board is used for connecting the EBTRON®, GreenTrolTM, or Paragon Airflow Measurement Digital Transmitter to the VCCX2 Control System. You must wire the Airflow Measurement Digital Transmitter to the Adapter Board as shown in Figure 31, this page. Up to four EBTRON®, GreenTrolTM, or Paragon Airflow Measurement Digital Transmitters can be attached to each Adapter Board. If using multiple E-BUS Sensors or Modules, the E-BUS Hub (ASM01635 or G033970) or E-BUS Adapter Board (ASM01878) may be required. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC-to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Figure 31: EBTRON® GTC116 or HTN104 Series, GreenTrolTM GA-200-N Series, and Paragon MicroTransEQ Series Airflow Measurement Digital Transmitter Wiring WIRING EBTRON®, GreenTrolTM, and Paragon Digital Transmitters NOTE: Only the EBTRON® GTC116 or HTN104 series, GreenTrolTM GA-200-N Module (with GF series Airflow Station), or Paragon MicroTransEQ series of MODBUS RTU transmitters are compatible with the VCCX2 Controller. No other series of transmitters will work for this application. Contact AAON Controls for information on other airflow station options. NOTE: The Airflow Station’s baud rate needs to be set to 19,200 in order to communicate with the VCCX2 Controller. NOTE: When configuring the GTC116 or HTN104 Series, be sure to set the Parity to “NO PARITY, 1 STOP BIT.”

Refrigerant System Module for VFD Compressors The ASM01686 Refrigerant System Module for VFD Compressors (RSMV) monitors and controls one tandem refrigeration circuit of the HVAC unit. The module is designed for R410-A refrigerant. The RSMV is connected to the VCCX2 Controller. Up to four RSMV’s can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow the use of communicating sensors and E-BUS modules. The RSMV provides four analog inputs, three binary inputs, three relays, and four analog outputs. See Figure 32, this page for inputs wiring and Figure 33, page 52 for outputs wiring. The RSMV provides the following: • Modulates the compressors to satisfy the Suction Coil (Saturated) Temperature. The Suction Coil (Saturated) Temperature Setpoint is reset by the VCCX2 Controller to maintain the Supply Air Temperature during Cooling Mode. During Dehumidification Mode, it controls the compressors to the Suction (Saturation) Temperature Setpoint. • Modulates the Condenser Fan to maintain the Head Pressure Setpoint. • Modulates the Expansion Valves to maintain the Superheat Setpoint. • Provides alarms and safeties for the compressor and condenser operation. • Provides a 2 x 8 LCD character display and four buttons that allow for status of system operation, system setpoints, system configurations, sensors, and alarms, and to change the module’s address, if necessary. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module. Figure 32: RSMV Inputs Wiring BK RD WH BK RD WH S P S UCTION RESSURE ENSOR H P S EAD RESSURE ENSOR COIL (SUCTION LINE) TEMP. 2 SENSOR COMPRESSOR STATUS 1 COMPRESSOR STATUS 2 18-30 VAC GND Line Voltage Size transformer for correct total load. RSMV = 18 VA COIL (SUCTION LINE) TEMP. 1 SENSOR WIRING RSMV Inputs

Suction Pressure Transducer The ASM02222 Suction Pressure Transducer must be wired as shown in Figure 32, page 51. It is required for all compressorized VCCX2 applications. The Suction Pressure Transducer is used to measure suction pressure at the HVAC unit’s DX evaporator coil suction line. This suction line pressure is converted to saturated refrigerant temperature by the RSMV Controller. This temperature is used by the RSMV to accurately control the expansion valves to maintain Superheat. The Saturated Refrigerant Temperature is used to properly control the compressors to maintain a given Suction Coil (Saturated) Temperature Setpoint. In Cooling and Heat Pump Mode, the VCCX2 resets the Suction Coil (Saturated) Temperature Setpoint to maintain a given Supply Air Temperature Setpoint. In Dehumidification Mode, the Suction Coil (Saturated) Temperature Setpoint is a user configurable setpoint that does not reset. Head Pressure Control The RSMV can monitor a Head Pressure Transducer and control condenser fans to maintain a Head Pressure Setpoint. The condenser fan will be controlled with a 0-10 VDC output signal. Coil Temperature Sensors The Coil Temperature sensors are used to measure Coil Temperature after each evaporator coil line. This temperature combined with the calculated Saturated Refrigerant Temperature is used to calculate the Superheat of each individual evaporator coil. The Superheat is used to drive the expansion valves to maintain a given Superheat Setpoint. CAUTION: The Shraeder port used for installation of the suction pressure transducer should be located in a vertical position of the suction line to prevent refrigerant oil from accumulating in the sensor. 18-30 VAC GND Line Voltage Size ransformer or t f c t l orrect otal oad. RSMV = 18 VA CONDENSER ENABLE COMPRESSOR 2 ENABLE COMPRESSOR 1 ENABLE 24 VAC ONLY RD WH BK GRN RD WH BK GRN EXPANSION VALVE 1 EXPANSION VALVE 2 COM + MODULATING COMPRESSOR COM + CONDENSER FAN SIGNAL Connect to VCCX2 Controller Note: All relay outputs are normally open and rated for 24 VAC power only. 1 amp maximum load. Figure 33: RSMV Outputs Wiring WIRING RSMV Outputs

Refrigerant System Module for VFD Compressors - Heat Pump The ASM01693 Refrigerant System Module for VFD Compressors - Heat Pump (RSMV-HP) monitors and controls one refrigeration circuit of the HVAC unit. The module is designed for R410-A refrigerant. The RSMV-HP is connected to the VCCX2 Controller. Up to 4 RSMV-HP’s can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow the use of communicating sensors and E-BUS modules. The RSMV-HP provides six analog inputs, four binary inputs, four relays, and two analog outputs. See Figure 34, this page for inputs wiring and Figure 35, page 54 for outputs wiring. Suction Pressure Transducer The ASM02222 Suction Pressure Transducer must be wired as shown in Figure 34, this page. It is required for all comp- ressorized VCCX2 applications. 18-30 VAC GND Line Voltage Size transformer for correct total load. RSMV = 18 VA RSMV-HP BK RD WH BK RD WH COMP STAT 1 COMP STAT 2 Coil Temp. 2 Sensor Coil Temp. 3 Sensor Coil Temp. 4 Sensor COM + COM + COIL TEMP SWITCH / POF Suction Pressure Sensor Head Pressure Sensor Coil Temp. 1 Sensor Leaving Water Temp Sensor Modulating Compressor Condenser Signal Figure 34: RSMV-HP Inputs Wiring WIRING RSMV-HP Inputs WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC- to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Expansion modules must be wired in such a way that the expansion modules and the controller are always powered together. Loss of power to the expansion module will cause the controller to become inoperative until power is restored to the expansion module.

Head Pressure Control The RSMV-HP can monitor a Head Pressure Transducer and control condenser fans to maintain a Head Pressure Setpoint. The condenser fan will be controlled with a 0-10 VDC output signal. Head pressure control can also be used to modulate the water valve when configured as a water source heat pump. The water valve signal is 2-10 VDC. Coil Temperature Sensors The Coil Temperature Sensors are used to measure Coil Temperature after each evaporator coil line. This temperature combined with the calculated saturated refrigerant temperature is used to calculate the Superheat of each individual evaporator coil. The Superheat is used to drive the Expansion Valves to maintain a given Superheat Setpoint. Leaving Water Temperature Sensor The Leaving Water Temperature Sensor is used to measure the Leaving Water Temperature when used on a WSHP unit. CAUTION: The Shraeder port used for installation of the suction pressure transducer should be located in a vertical position of the suction line to prevent refrigerant oil from accumulating in the sensor. NOTE: If there are two Compressors on a single circuit (a tandem circuit), Suction Pressure 2, Head Pressure 2, and Condenser Signal 2 would not be used. 18-30 VAC GND Line Voltage Size transformer for correct total load. RSMV = 18 VA RSMV-HP REVERSING VALVE COMPRESSOR 2 ENABLE COMPRESSOR 1 ENABLE 24 VAC ONLY RD WH BK GRN Expansion Valve 1 RD WH BK GRN Expansion Valve 2 RD WH BK GRN Expansion Valve 3 RD WH BK GRN Expansion Valve 4 CONDENSER ENABLE Connect to VCCX2 Controller Note: All relay outputs are normally open and rated for 24 VAC power only. 1 amp maximum load. Figure 35: RSMV-HP Outputs Wiring WIRING RSMV-HP Outputs

18-30 VAC GND Line Voltage Size ransformer or t f c t l orrect otal oad. RSMD = 18 VA RSMD BK RD WH BK RD WH S P 1 S UCTION RESSURE ENSOR H P 1 S EAD RESSURE ENSOR COMP STATUS 1 COMP STATUS 2 EMERGENCY SHUTDOWN OUTSIDE COIL TEMP/POWF 10A250VAC ~ 5A30VDC SA VDE G5Q-1A4 OMRON DC12V CHINA BK RD WH BK RD WH S P 2 S UCTION RESSURE ENSOR H P 2 S EAD RESSURE ENSOR COMP. DISCHARGE TEMP. 1 SENSOR LEAVING WATER TEMP SENSOR COMP. DISCHARGE TEMP. 2 SENSOR Figure 36: RSMD Inputs Wiring Refrigerant System Module for Digital Compressors The ASM02201 Refrigerant System Module for Digital Compressors (RSMD) can monitor and control up to two compressors and condensers. The compressors can be in either a tandem or non-tandem configuration. The module is designed for R410-A refrigerant. The RSMD is connected to the VCCX2 Controller. Up to four RSMD’s can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow the use of communicating sensors and the E-BUS Modules. The RSMD provides three analog inputs, four binary inputs, five relays, and two analog outputs. See Figure 36, this page for inputs wiring and Figure 37, page 56 for outputs wiring. Suction Pressure Transducer The ASM02222 Suction Pressure Transducers must be wired as shown in Figure 36, this page. It is typically required for all VCCX2 applications. WIRING RSMD Inputs

18-30 VAC GND Line Voltage Size transformer for correct total load. RSMD = 18 VA RSMD REVERSING VALVE COMPRESSOR 2 ENABLE COMPRESSOR 1 ENABLE 24 VAC ONLY CONDENSER 1 ENABLE 10A250VAC ~ 5A30VDC SA VDE G5Q-1A4 OMRON DC12V CHINA CONDENSER 2 ENABLE DIGITAL COMPRESSOR 1 + GND DIGITAL COMPRESSOR 2 COM + CONDENSER SIGNAL 1 Connects to VCCX2 loop communications connector when used an a split system. Connect to VCCX2 Controller CONDENSER SIGNAL 2 3 Y1 2 + 1 COM WSE BYPASS VALVE ACTUATOR Belimo Actuator wiring shown. Consult factory for other manufacturer wiring instructions COM + + GND Note: All relay outputs are normally open and rated for 24 VAC power only. 1 amp maximum load. Figure 37: RSMD Outputs Wiring Head Pressure Control The Head Pressure Transducers are used to measure Head Pressure at the discharge line. This Head Pressure is used to drive the condenser fans with a 0-10 VDC output signal to maintain a given Head Pressure Setpoint. Compressor Discharge Sensors The Digital Compressor Discharge Temperature Sensor monitors the discharge temperature from the Digital Compressor to protect against overheating. Leaving Water Temperature Sensor The Leaving Water Temperature Sensor is used to measure the Leaving Water Temperature when used on a WSHP unit. CAUTION: The Shraeder port used for installation of the suction pressure transducer should be located in a vertical position of the suction line to prevent refrigerant oil from accumulating in the sensor. NOTE: If there are two compressors on a single circuit (a tandem circuit), Suction Pressure 2, Head Pressure 2, and Condenser Signal 2 would not be used. WIRING RSMD Outputs

RSMZ Inputs Wiring The RSMZ monitors and controls one refrigeration circuit of the HVAC unit. The RSMZ is used on RZ units and on RN-E units with Danfoss compressors. The module is designed for R410-A refrigerant. The RSMZ is connected to the VCCX2 Controller. Three or six RSMZ Modules can be connected, depending on the size of the system. There are two E-BUS Expansion Ports which allow the use of communicating sensors and E-BUS modules. There is a MODBUS terminal block which allows wiring to the Reheat Expansion Module or VFD Compressor. The RSMZ must be connected to an 18-30 VAC power source. When wiring the RSMZ Controller, its relay outputs must be wired as wet contacts (connected to 24 VAC). See Figure 38, this page for input wiring. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC-to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. ALARM UP DOWN ENTER MENU 18-30 VAC GND Line Voltage Size transformer for correct total load. RSMZ Controller = 18 VA COM + BK RD WH RSMZ Head Pressure Transducer Discharge Temperature Sensor Compressor 1 Status Compressor 1 Status Oil Level Switch Condenser Fan Figure 38: RSMZ Inputs Wiring WIRING RSMZ Inputs

RSMZ Outputs Wiring The RSMZ provides the following features: • Modulates the Compressors to satisfy the Suction Coil (Saturated) Temperature. The Suction Coil (Saturated) Temperature Setpoint is reset by the VCCX2 Controller to maintain the Supply Air Temperature during Cooling mode. During Dehumidification mode, it controls the Compressors to the Suction (Saturation) Temperature Setpoint. • Modulates the Condenser Fan or Valve to maintain the Head Pressure Setpoint. • Monitors the performance of the DMQ Universal Superheat Controller/Sensor (USHX) to maintain the Superheat Setpoint of each evaporator coil. • Provides alarms and safeties for the Compressor and Condenser operation. • Provides a 2 x 8 LCD character display and four buttons that allow for status of system operation, system setpoints, system configurations, sensors, and alarms, and to change the module’s address, if necessary. See Figure 39, this page for output wiring. ALARM UP DOWN ENTER MENU 18-30 VAC GND Line Voltage RSMZ Controller = 18 VA Size transformer for correct total load. CONDENSER FAN ENABLE COMPRESSOR 1 ENABLE COMPRESSOR 2 ENABLE REHEAT ENABLE 24 VAC R RSMZ RED GRN BLK RED GRN BLK DMQ USHX #1 Superheat Controller Terminals DMQ USHX #2 Superheat Controller Terminals Figure 39: RSMZ Outputs Wiring WIRING RSMZ Outputs

Subcool Monitor Wiring The ASM02350 Subcool Monitor reads the liquid line pressure and then converts it to saturated liquid temperature and compares it to the measured liquid line temperature to calculate subcooling. The use of the Subcool Monitor Module is optional. The Subcool Monitor is connected to the VCCX2 Controller. One or two Subcool Monitors can be connected, depending on the size of the system: • One Subcool Monitor Module is used when three RSMZ’s are used • Two Subcool Monitor Modules are used when six RSMZ’s are used. The Subcool Monitor contains a 2 x 8 LCD character display and four buttons that allow for configuration, status, and alarm display. This module must be configured to work with R410-A refrigerant and is configured for 667 PSI liquid line pressure transducers. The Subcool Monitor must be connected to an 18-30 VAC power source. See Figure 40, this page for wiring. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC-to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. 10A250VAC ~ 5A30VDC SA VDE G5Q-1A4 OMRON DC12V CHINA BK RD WH BK RD WH BK RD WH 18-30 VAC GND Line Voltage Size Transformer For Correct Total Load. Subcool Monitor Controller = 18 VA Liquid Line Pressure Transducer 1 Liquid Line Pressure Transducer 2 Liquid Line Pressure Transducer 3 Liquid Line Temp Sensor #2 Sensor #1 Liquid Line Temp Sensor #3 Liquid Line Temp ALARM UP DOWN ENTER MENU Figure 40: Subcool Monitor Wiring WIRING Subcool Monitor Module

Line Voltage GND 18-30 VAC 40 VA Transformer minimum Supply Air Temperature Sensor Mount In Supply Air Duct RED GRN WHT BLK Condenser Valve #1 HGR Valve #1 RED GRN WHT BLK Supply Air Temperature Sensor connects to AI3 & GND On VCCX2 Controller MHGRV-X CONTROLLER Set Jumper to NORMAL. Fan Compressor HGR Solenoid Valve 2 Position HGR Valve (Optional) C1 C2 EBC E-BUS cable connects to VCCX2 Expansion port EBC E-BUS cable connects to Reheat Expansion Module Alternate Configuration 3 Way Valve RED GRN WHT BLK MHGRV-X Wiring The ASM01670 MHGRV-X is designed to control a Modulating Hot Gas Reheat Valve to maintain a desired Supply Air Temperature and Dehumidification setpoint. In addition, up to seven ASM01687 Reheat Expansion Modules can be connected to the MHGRV-X and to each other for additional Reheat Valve Control. The MHGRV-X directly connects to the VCCX2 Controller or indirectly using an E-BUS Expansion Board via an E-BUS cable. See Figure 41, this page. NOTE: If using multiple E-BUS sensors or modules, a E-BUS hub or adapter board may be required. The following information will be passed between the MHGRV-X and the VCCX2 Controller: • Reheat Enable command • Supply Air Temperature Setpoint • The Reset Supply Air Temperature Setpoint • The Supply Air Temperature Reset Signal If the communication is interrupted between the MHGRV-X and the VCCX2 Controller, the MHGRV-X will revert to stand-alone operation. For more information, refer to the MHGRV-X Technical Guide. Figure 41: MHGRV-X to VCCX2 Controller Wiring WIRING MHGRV-X

MODGAS-X Wiring The ASM01668 MODGAS-X is designed to modulate up to two gas valves to maintain a desired Discharge Air Temperature. It also controls the speed of the induced draft fan to maintain proper combustion in the heat exchanger. The MODGAS-X directly connects to the VCCX2 Controller or indirectly using an E-BUS Expansion Board via an E-BUS cable. See Figure 42, this page. NOTE: If using multiple E-BUS sensors or modules, a E-BUS hub or adapter board may be required. The following information will be passed between the MODGAS-X and the VCCX2 Controller: • Heat activation command • Heating Discharge Setpoint • The offset for the Supply Air Temperature Sensor • High Limit Temperature Setpoint • If the communication is interrupted between the MODGAS-X and the VCCX2 Controller, the MODGAS-X will revert to stand-alone operation. For more information, refer to the MODGAS-X Technical Guide. Supply Air Temperature Sensor Mount In Supply Air Duct Connect Supply Air Temperature Sensor to AI3 & GND on VCCX2 Controller E-BUS cable connects to VCCX2 Controller’s Expansion Port Set Jumper to 1. Fan Enable Low Speed Fan 24 VAC power input terminals maximum power consumption One Gas Valve = 18 VA Two Gas Valves = 33 VA Aux Heat Valve Note: 1. 24 VAC must be connected so that all ground wires remain common. 2. All wiring to be in accordance with local and national electrical codes and specifications. 18-30 VAC GND Two gas valves can be connected as shown Line Voltage 40 VA Transformer minimum Figure 42: MODGAS-X to VCCX2 Controller Wiring WIRING MODGAS-X

MODGAS-XWR2 Wiring The ASM01695 MODGAS-XWR2 is designed to be used with White-Rodgers® valves only. It will modulate up to two White- Rodgers® gas valves to maintain a desired Discharge (Supply) Air Temperature (up to four modulating gas valves may be controlled when a second MODGAS-XWR2 is configured as a slave module). The module also controls the speed of the induced draft fan to maintain proper combustion in the heat exchanger. The module can be used as a stand-alone unit or be connected to the 12 Relay E-BUS Expansion Module (stand-alone only) or VCCX2 Controller using an E-BUS cable. See Figure 43, this page. The following information will be passed between the MODGAS- XWR2 and the VCCX2 Controller: • Heat activation command • Heating Discharge Setpoint • The offset for the Supply Air Temperature Sensor • High Limit Temperature Setpoint • If the communication is interrupted between the MODGAS-XWR2 and the VCCX2 Controller, the MODGAS-XWR2 will revert to stand-alone operation. For more information, refer to the MODGAS-XWR2 Technical Guide. Proof of Ignition Signal 1 (24 VAC) Fan Enable Low Speed Fan Heat Valve 1 Heat Valve 2 Fixed Heat Stage 3 Fixed Heat Stage 4 Proof of Ignition Signal 2 (24 VAC) Note: 1. 24 VAC must be connected so that all ground wires remain common. 2. All wiring to be in accordance with local and national electrical codes and specifications. Connect Supply Air Temperature sensor to AI3 and GND to VCCX2. Mount in supply air duct Supply Air Temperature Sensor The SAT OPTIONS jumper setting should be set to 1. Only one Supply Air Temperature sensor can be used per application. Line Voltage 40 VA Transformer minimum GND 18-30 VAC Check your fan relay wiring (RLY 1) schematic for proper wiring. EBC E-BUS cable connects to VCCX2 expansion port Modulating Gas Valve 2 (Modulates with Valve 1 as 1 stage) Modulating Gas Valve 1 (Modulates with Valve 2 as 1 stage) GND AUX BIN HEAT EN RESET IN OPTIONS GND SAT GND AUX AIN STATUS ALARM COMM POWER YS102408 REV 3 RLY1 RLY2 RLY3 RLY4 RLY5 RLY6 COMMON PO-IGN1 PO-IGN1 GAS VALVE 1 GAS VALVE 2 AAON P/N: ASM01695 MODGAS-XWR2 LABEL P/N: G041530 DUAL E-BUS I2C CONNECT +24 VAC GND CONTACT 1 AMP MAX @ 24 VAC RATING IS COMMON RELAY OUTPUTS GAS VALVE TERMINALS GAS VALVE 1 GAS VALVE 2 INPUT TERMINALS (TYPE) HEAT ENABLE (BI) AUX. (BI) GND RESET IN (AI) SAT IN (AI) GND (AI) GND AUX. (AI) www.aaon.com LOW SPEED HEAT 1 HEAT 2 HEAT 3 HEAT 4 PROOF OF IGNITION 1 PROOF OF IGNITION 2 FAN ALARM UP DOWN ENTER MENU Figure 43: MODGAS-XWR2 to VCCX2 Controller Wiring WIRING MODGAS-XWR2

Entering Air Temperature Sensor Reset In 0-10 VDC GND + - Emergency Shutdown Line GND 40 VA transformer minimum Heat 1 Relay Heat 2 Relay Heat 3 Relay Heat 4 Relay Heat 5 Relay Heat 6 Relay Relay Contact PWM SSR + Modulating SCR (0-10 VDC) + Leaving Air 2 Temperature Sensor Leaving Air 1 Temperature Sensor SAFETIES (by others) N.C. Heat Enable Signal (24 VAC) W1 Mount inside PREHEAT-X box wall Mount inside PREHEAT-X box wall EBC E-BUS cable connects to the VCCX2 Controllers Expansion Port 18-30 VAC Make splice connections inside sensor enclosure as shown. Seal all conduit fittings with Silicone sealant. Mount sensor outdoors in a shaded protected area and in the upright position as shown. Note: Reset In and Heat Enable Inputs are used in Stand-Alone Mode only. Note: All relay outputs are normally open and rated for 24 VAC only. 1 amp maximum load. Figure 44: PREHEAT-X to VCCX2 Controller Wiring PREHEAT-X and PREHEAT-X-EXT Controller Wiring The ASM01688 PREHEAT-X and ASM01689 PREHEAT-X- EXT are designed to control fixed stages of Preheat and optional modulating Preheat to maintain a desired Preheat Leaving Air Temperature Setpoint. The PREHEAT-X is limited to a 35°F Leaving Air Temperature Setpoint. The PREHEAT-X-EXT has an extended Leaving Air Temperature Setpoint range down to 0°F. It should only be used with the approval of AAON. Either PREHEAT-X directly connects to the VCCX2 Controller or indirectly using an E-BUS Expansion Board via an E-BUS cable. See Figure 44, this page for wiring. The following information will be passed between either PREHEAT-X and the VCCX2 Controller: • Leaving Air Temperature Setpoint • Entering Air Temperature Setpoint • Preheat Enable Signal • Leaving Air Temperature Status • Entering Air Temperature Status • Alarm Status • If the communication is interrupted between the PREHEAT-X and the VCCX2 Controller, the PREHEAT-X will be disabled. For more information, refer to the PREHEAT-X or PREHEAT- X-EXT Technical Guide. WIRING PREHEAT-X and PREHEAT-X-EXT

Before Applying Power In order to have a trouble free start-up, it is important to follow a few simple procedures. Before applying power for the first time, it is very important to run through a few simple checks. Power Wiring One of the most important checks to make before powering up the system for the first time is to confirm proper voltage and transformer sizing for each controller. Each VCCX2 Controller requires 15 VA of power delivered to it at 24 VAC. You may use separate transformers for each device (preferred) or power several devices from a common transformer. WARNING: Observe Polarity! All boards must be wired with GND-to-GND and 24 VAC-to-24 VAC. Failure to observe polarity will result in damage to one or more of the boards. Check all wiring leads at the terminal block for tightness. Be sure that wire strands do not stick out and touch adjacent terminals. Confirm that all sensors required for your system are mounted in the appropriate location and wired into the correct terminals on the VCCX2 Controller. After all the above wiring checks are complete, apply power to the VCCX2 Controller. Configuring the Controller The next step is configuring the controller for your specific requirements. In order to configure the VCCX2 Controller, you must use an operator interface. Four different operator interfaces are available for programming and monitoring of the VCCX2 Controller. See Figure 45, this page. They are as follows: • Modular Service Tool SD • Modular System Manager SD • PC with Prism 2 Software installed and CommLink 5 • System Manager TS-L (Touch Screen - Limited Access) Any of these devices or a combination of them can be used to access the status, configuration, and setpoints of any controller on your communications loop. If using the Modular Service Tool SD or the Modular System Manager SD for programming, refer to the VCCX2 Controller Operator Interface SD Technical Guide. If using a computer and the Prism 2 software for programming, refer to the Prism 2 Technical Guide. If using the System Manager TS-L for monitoring, please see the System Manager TS-L Technical Guide. No matter which operator interface you use, we recommend that you proceed with the programming and setup of the VCCX2 Controller in the order that follows: 1. Configure the controller for your application. 2. Program the controller setpoints. 3. Program the controller operation schedules. 4. Set the controller current time and date. 5. Review the controller status screens to verify system operation and correct controller configuration. NOTE: For BACnet® Configuration, see Appendix C, page 116. STATUS SETPOINTS SCHEDULES OVERRIDES ALARMS 7 8 0 DEC MINUS 9 4 5 6 1 2 3 ENTER ESC CLLAR DOWN UP PREV NEXT Figure 45: Modular Service Tool SD, Modular System Manager SD, System Manager TS-L, and Prism 2 Software Operator Interfaces START-UP AND COMMISSIONING Powering Up and Configuration

Input/Output Map See Table 2, this page for VCCX2 Controller Inputs/Outputs and Table 3 for VCC-X EM1 Inputs/Outputs. For the RSM Module Input/Output tables, please see each individual RSM Module Technical Guide. VCCX2 CONTROLLER Analog Inputs 1 Space Temperature (AI1) 2 Space Slide Adjust (AI2) 3 Supply Air Temperature (AI3) 4 Return Air Temperature (AI4) 5 Building Pressure (AI5) 6 Supply Air Temperature Reset (AI6) 7 Outdoor Air Temperature (AI7) 8 Supply Duct Static Pressure (Duct Static Jack) Binary Inputs 1 Proof of Flow (BIN1) 2 Dirty Filter (BIN2) 3 Hood On/Off (BIN3) 4 Remote Forced Occupied (BIN4) 5 Remote Forced Cooling (BIN5) 6 Remote Forced Heating (BIN6) 7 Remote Forced Dehumidification (BIN7) 8 Emergency Shutdown (BIN8) Analog Outputs (0-10 VDC) 1 Main Supply Fan VFD or Bypass Damper (AO1) 2 Economizer (Outdoor Air Damper) or Waterside Economizer Actuator (AO2) 3 Modulating Heating (Hot Water, Steam, or SCR) (AO3) 4 Exhaust Fan VFD / Building Pressure Control Signal (AO4) VCC-X EM1 EXPANSION MODULE Analog Inputs 1 Entering Water Temperature Sensor (T1) 2 Economizer Actuator Feedback (SIG3) (0-5 or 0-10 V) 3 Return Air Plenum Pressure (SIG1) (0-5V) 4 Exhaust Duct Static Pressure (Duct Static Jack) Binary Inputs 1 Return/Exhaust Proof of Flow (BIN1) Analog Outputs (0-10 or 2-10 VDC) 1 Chilled Water (AOUT1) 2 Return Air Damper (AOUT2) 3 Return Air Bypass (AOUT3) 4 Motorized Exhaust Damper (AOUT4) Relay Outputs (24 VAC) 1 Configurable Relay (R1) 2 Configurable Relay (R2) 3 Configurable Relay (R3) 4 Configurable Relay (R4) 5 Configurable Relay (R5) Table 2: VCCX2 Controller Inputs and Outputs Relay Outputs (24 VAC) 1 Fan Relay (RLY1) 2 Configurable Relay (RLY2) 3 Configurable Relay (RLY3) 4 Configurable Relay (RLY4) 5 Configurable Relay (RLY5) 6 Configurable Relay (RLY6) 7 Configurable Relay (RLY7) 8 Configurable Relay (RLY8) Note: The following E-BUS sensors and modules are available to connect to the VCCX2 Controller via E-BUS ports or E-BUS Expansion Modules: 1. E-BUS Digital Room Sensor - LCD Display - Temp Only or Temp and Humidity 2. E-BUS Digital Room Sensor - No LCD Display - Temp and Humidity 3. E-BUS Space and Return Air CO2 Sensors 4. E-BUS connection to EBTRON, GreenTrol™ and Paragon airflow stations 5. E-BUS Outdoor Air Temperature and Humidity Sensor Table 2: VCCX2 Controller Inputs and Outputs (continued) Table 3: VCC-X EM1 Inputs and Outputs INPUTS AND OUTPUTS VCCX2 Controller and EM1 Module Input/Output Maps

VCCX2 Controller Inputs AI1 - Space Temperature Sensor Input The Space Temperature Sensor will initiate Occupied Heating and Cooling modes if the unit is configured for Space Temperature control. It is always the sensor used to initiate Unoccupied Heating and Cooling modes. If the Space Temperature Sensor used is equipped with the optional Push-Button Override feature, this input will detect user overrides and switch the unit from the Unoccupied Mode back to the Occupied Mode operation for a user-adjustable amount of time. The Space Temperature can also be configured to reset the Supply Air Temperature Setpoint. AI2 - Space Temperature Sensor Slide Adjust If the Space Temperature Sensor being used has the optional Slide Adjust feature, its AUX output is connected to this input. The Slide Adjust control is used to vary the HVAC Mode Heating and Cooling Setpoints by a user-configured maximum amount. If the Space Temperature is configured as the SAT Reset Source, the Slide Adjustment adjusts both the HVAC Mode Enable Heating and Cooling Setpoints and the SAT Reset Source Heating and Cooling Setpoints simultaneously by a user-configurable maximum amount. AI3 - Supply Air Temperature (SAT) Sensor Input Once the unit is in the Heating or Cooling Mode (based on the temperature at the mode enable sensor), the unit will control the staging or modulation of the heating or cooling sources to maintain a Heating or Cooling SAT Setpoint. The HVAC unit must always have a SAT Sensor installed. AI4 - Return Air Temperature Sensor Input If you want to generate occupied Heating and Cooling demands based on Return Air Temperature, select this sensor as the HVAC Mode Enable Sensor. The Return Air Temperature Sensor is also used to initiate or cancel the Morning Warm-up / Cool-down Period on VAV-configured units. If the Return Air Temperature Sensor is connected, the Outdoor Air Temperature must be at least 5°F below the Return Air Temperature to allow Economizer Cooling operation. AI5 - Building Static Pressure Sensor Input This Sensor is only required if you wish to configure the VCCX2 Controller for Building Pressure Control. Building Pressure Control can be accomplished by using one of two main control methods. One control method uses the 0-10 VDC signal to control an Exhaust Fan VFD or an Exhaust Damper Actuator for Direct Acting Pressure Control applications. In addition, for Reverse Acting Pressure Control applications, it can control an Outdoor Air Damper Actuator (or in certain cases, the VFD Supply Fan). The other available control method is to configure one of the output relays as an exhaust fan output that will activate the exhaust fan any time the building pressure is above the Building Pressure Setpoint. AI6 - Remote Supply Air Temperature Reset Signal If a Remote SAT Reset Signal is configured as the Reset Source, this input can be used to accept a configurable voltage input between 0-10 VDC (Direct or Reverse Acting) to reset the SAT Setpoint. See the SAT Reset section in the Sequence of Operations for more details. AI7 - Outdoor Air Temperature Sensor Input The Outdoor Air Temperature is used to lock out Heating or Cooling to conserve energy at whatever temperature you deem appropriate for each Mode of Operation. This sensor is also used to initiate Heating and Cooling modes on a Make Up Air unit. The Outdoor Air Temperature Sensor can also be used for Preheater operation and for Low Ambient Protection operation. NOTE: For AI1, AI3, AI4 and AI7, all Temperature Sensors must be Thermistor Type III which provide 77.0°F @ 10K ohms resistance. AI8 - Supply Duct Static Pressure Sensor Input This jack-style input connection accepts a Duct Static Pressure Sensor modular cable input. The Duct Static Pressure Sensor reading is used to determine current Duct Static Pressure. This Static Pressure reading is used to control the output signal supplied to the Supply Fan VFD or Zoning Bypass Damper Actuator. If you have configured the HVAC unit for Constant Volume operation, this sensor is optional. If it is installed on a Constant Volume unit, it can be used for filter loading VFD control or used for a status-only reading. BIN1 - Proof of Flow Input A Proof of Flow Switch (by others) that provides a wet contact closure whenever the HVAC unit Supply Fan is operating can be connected to this input. If the Proof of Flow Switch contact opens while the Supply Fan is operating, all Heating and Cooling is suspended or disabled. BIN2 - Dirty Filter Contact Closure Input This wet contact input is required for Filter Status Indication and requires a Differential Pressure Switch to initiate a Dirty Filter alarm. INPUTS AND OUTPUTS VCCX2 Controller Inputs

BIN3 - Hood On/Off Input When this wet contact input closes (Hood On), the VCCX2 Controller switches from Indoor Air Control to Outdoor Air Control. This is typically used on CAV applications requiring CAV/MUA Dual Damper (Hood On/Off) Modes. BIN4 - Remote Forced Occupied Mode Input When this wet contact input closes, it will force the VCCX2 Controller into the Occupied Mode. When the Remote Forced Occupied Signal is removed, the controller will revert to the Unoccupied Mode of operation if no internal or external schedule has been configured or is in effect when this occurs. NOTE: If Remote Forced operation is used, it must apply to Cooling, Heating, and Dehumidification. The unit must be configured for Mode Set By Remote Contact. BIN5 - Remote Forced Cooling Mode Input A wet contact closure on this input is used to provide a means for another BAS or control device (by others) to force the unit into Cooling Mode. BIN6 - Remote Forced Heating Mode Input A wet contact closure on this input is used to provide a means for another BAS or control device (by others) to force the unit into Heating Mode. BIN7 - Remote Forced Dehumidification Input A wet contact closure on this input is used to provide a means for another BAS or control device (by others) to force the VCCX2 Controller into Dehumidification Mode. BIN8 - Emergency Shutdown Input This wet contact input is used to initiate shutdown of the HVAC unit when a normally closed Smoke Detector (by others), Firestat (by others), or other shutdown condition (by others) contact is opened. The controller remains active and can initiate alarm relays. NOTE: The binary inputs require wet contacts (24 VAC only) to recognize an active input. If you provide dry contacts, the contact closure will not be recognized. All binary inputs are optional. This means that you must configure the VCCX2 Controller to recognize these input signals. VCCX2 Controller Outputs AO1 - Main Supply Fan VFD Control Signal or Bypass Damper Control Signal This user-adjustable voltage signal is used to modulate the Supply Fan VFD in VAV, Single Zone VAV, Filter Loading applications, or Reverse Acting Building Pressure Control using the VFD. In a VVT Zoning application, this output would be used to control a Bypass Damper. AO2 - Outdoor Air Damper Economizer Control Signal or Waterside Economizer Valve Signal Outdoor Air Damper Economizer Control Signal This user-adjustable voltage signal is used to control the Outdoor Air Damper during Economizer operation. It is also used to maintain the Outdoor Air Damper at its minimum position during Occupied Mode when the Outdoor Air Temperature is not suitable for Economizer cooling purposes. This minimum position can be reset based on CO2 override conditions. This output is also used to control the Outdoor Air Damper based on an Outdoor Airflow Setpoint if using an Outdoor Airflow Monitoring station. This position can be overridden during Economizer Control. Finally, this output can be used to control the Outdoor Air Damper during Reverse Acting Building Pressure Control to maintain a Building Pressure Setpoint. Waterside Economizer Valve Signal This 2-10 VDC signal is used to modulate the Waterside Economizer valve during Waterside Economizer operation. AO3 - Modulating Heat Control Signal This output can be configured with a user-adjustable voltage range of operation which can be set up to provide either a direct or reverse acting operation. This output is used to operate a modulating heating device to maintain the Heating Supply Air Setpoint during the Heat Mode of operation. AO4 - Exhaust Fan VFD Signal / Building Pressure Control Signal This user-adjustable voltage signal is used to provide Direct Acting Building Pressure Control using an Exhaust Fan VFD or a modulating Exhaust Damper. INPUTS AND OUTPUTS VCCX2 Controller Outputs

R1 - Supply Fan (Enable) This is a non-configurable output. R2-R8 - User-Configurable Relays These relays are configurable by the user. For all the available configuration options, see Table 4, page 69. VCC-X EM1 Expansion Module T1 - Entering Water Temperature Sensor Input The Entering Water is used to determine when to initiate Waterside Economizer operation. If the unit is in Cooling Mode and the Entering Water Temperature drops 10˚F (adj.) below the Entering Air Temperature, the unit will begin to modulate the Waterside Economizer Valve as part of the cooling operation. See Waterside Economizer (page 87) for a full description of this operation. SIG1 - Return Air Plenum Pressure Sensor Input The sensor is only required when controlling a motorized exhaust damper to maintain the Return Air Plenum Pressure Setpoint. SIG3 - Economizer Feedback If Title 24 Economizer operation has been configured, this input will be used for the 2-10 VDC Feedback Signal from the Economizer actuator. Exhaust Duct Static Pressure Sensor Input This jack-style input connection accepts a Duct Static Pressure Sensor modular connector input used for Exhaust Duct Static Pressure Control. This Static Pressure reading is used to control the output signal (AO4 on the VCCX2 Controller) supplied to the Exhaust Fan VFD. BIN 1 - Return/Exhaust Proof of Flow A Proof of Flow Switch that provides a wet contact closure whenever the HVAC unit Return Fan or Exhaust Fan is operating can be connected to this input. AOUT1 - Modulating Chilled Water Valve Actuator This output is used to control a Modulating Chilled Water Valve Actuator to maintain the Cooling Supply Air Temperature Setpoint. This output provides a 0-10 or 2-10 VDC direct acting signal. AOUT2 - Return Air Damper Actuator Signal This output signal is a direct acting 2-10 VDC output signal that is used to modulate a Return Air Damper Actuator in conjunction with a Return Air Bypass Damper Actuator for AAON® Precise Air Control (PAC) or Digital Precise Air Control (D-PAC) applications. AOUT3 - Return Air Bypass Damper Actuator Signal This output signal is a direct acting 2-10 VDC output signal that is used to modulate a Return Air Bypass Damper Actuator in conjunction with a Return Air Damper Actuator for AAON® Precise Air Control (PAC) or Digital Precise Air Control (D-PAC) applications. AOUT4 - Motorized Exhaust Damper Actuator Signal This output signal is a direct acting 2-10 VDC output signal that is used to modulate the Motorized Exhaust Damper Actuator. R1-R5 - User-Configurable Relays These relays are configurable by the user. For all the available configuration options, see Table 4, page 69. 12 Relay E-BUS Expansion Module Please refer to the user-configurable relays in Table 4, page 69 for relay definitions. NOTE: For Reverse Acting Building Pressure Control using the Outdoor Air Damper or Supply Fan VFD, the VCCX2 Controller will use the outputs specific to those devices. On the main VCCX2 Controller, AO2 would control the Outdoor Air Damper and AO1 would control the Supply Fan VFD to maintain the Building Pressure Setpoint. Alternatively, this AO4 output will mirror those outputs and can be used as well. INPUTS AND OUTPUTS VCC-X EM1 Expansion Module

No. Relay Description Details 1 Cooling Stage Configured for each fixed stage of cooling (except heat pump compressor). 2 Heating Stage Configured for each fixed stage of heating. 3 Aux Heat Configured for a fixed stage of Aux Heat in a heat pump unit. 4 Emergency Heat Configured for a fixed stage Emergency Heat in a heat pump unit. 5 Mod Heat Enable Configure if a 0-10 VDC Modulating Heat source needs a relay to enable it. 6 Mod Cool Enable Configure if a 0-10 VDC Modulating Cool source needs a relay to enable it. 7 Morning Warm-Up/ Cool-Down (VAV Boxes) Configure (1) Relay for Morning Warm-Up/Cool-Down when Non-Orion VAV/Zone Controllers are used. 8 Reheat Configure (1) Relay for On/Off Reheat when used. 9 Preheat Configure for Preheat operation. 10 Low Ambient Configure for Low Ambient operation. 11 Exhaust Fan Configure (1) Relay for enabling exhaust fan when Building Pressure Control is used. 12 Economizer Active If configured, this relay will energize if unit is in Economizer Mode and the damper has moved 5% above its Economizer Minimum Setpoint position or if the damper moves above a user-adjustable position setpoint. 13 Heat Wheel Configure (1) Relay that turns heat wheel on when in occupied operation and turns heat wheel off when in Economizer Mode. 14 Occupied Active If configured, this relay will energize whenever the unit is in the Occupied Mode. 15 Override Active If configured, this relay will energize anytime the space sensor push-button override is active. 16 Alarm Active If configured, this relay will energize anytime a VCCX2 alarm is active. 17 A1 Comp Run Status Will enable when the RSM A1 compressor activates. 18 A2 Comp Run Status Will enable when the RSM A2 compressor activates. 19 B1 Comp Run Status Will enable when the RSM B1 compressor activates. 20 B2 Comp Run Status Will enable when the RSM B2 compressor activates. 21 Condenser Pump If configured, this relay will energize when the unit requires the Evaporative Condenser to be enabled. 22 Sump Heater If configured, this relay will energize when the unit requires the Sump Heater to be enabled. 23 Sump Pump Drain If configured, this relay will energize when the unit requires the Sump Pump Drain to be enabled. Table 4: User-Configurable Relay Outputs INPUTS AND OUTPUTS 12 Relay E-BUS Expansion Module

Supply Fan Operation Any time the Supply Fan is requested to start, a one-minute minimum off timer must be satisfied. If the timer is satisfied, the Supply Fan relay is activated while all other outputs are held off until their minimum off timers have been met. Upon going into the Occupied Mode or upon power-up, the controller will initiate a user-adjustable Fan Starting Delay to provide a staggered start for systems with several HVAC units. In Fan Cycle Mode or when going unoccupied, the Supply Fan is held on for 10 seconds after Cooling has staged off or after Leaving Vent Mode and 90 seconds after the Heating has staged off. Purge Mode When going into Occupied Mode, an optional “Purge Mode” is initiated. The fan runs with the Economizer closed, and all Cooling and Heating is de-energized. The length of the Purge Mode is user-adjustable. Occupied Mode The Supply Fan can be configured to run continuously (default) or to cycle with Heating, Cooling, or Dehumidification. Unoccupied Mode Upon going Unoccupied, the Cooling or Heating will turn off immediately. The Fan will then turn off in 30 to 60 seconds. Typically, thereafter, the Supply Fan will cycle on a call for Heating, Cooling, or Dehumidification. The Supply Fan can also be configured for continuous operation during Unoccupied Mode. HVAC Source Configuration Options The VCCX2 Controller can be configured to have various HVAC Source options that will determine the mode of operation (Heating, Cooling, or Vent Mode) of the unit. The following are descriptions of those options. Space Temperature—Typical selection for CAV recirculating units. Return Air Temperature—Optional selection for CAV recirculating units. Single Zone VAV—Selected for a Space Temperature controlled Single Zone VAV application. Outdoor Air Temperature—Typical selection for 100% Outdoor Air (MUA) or High Percentage Outdoor Air units. Supply Air Temperature—Selected for Cooling Only. VAV units with optional Morning Warm-Up/Cool-Down. Supply Air Tempering—Selected for VAV units maintaining a Cooling Setpoint with Cooling or Heating as required that may need heat to temper the Supply Air Temperature during very cold conditions. Space Temperature with High Outdoor Air %— Provides Space Temperature (instead of Outdoor Air Temperature) control of 100% or high percentage Outdoor Air units by tempering the air during the Space Vent Mode of operation to prevent dumping of hot or cold air into the space. HVAC Mode Set by Remote Contact— Provides for wet contact closures to force the unit into Heating, Cooling, and Dehumidification modes. If this option is selected, it applies to all three modes, and all three modes will only be initiated by these contact closures. If both the Heating and Cooling contacts are made, the unit will be in the Vent mode. Occupied/Unoccupied Mode of Operation The VCCX2 Controller can utilize several methods for determining the Occupied Mode of Operation. These are as follows: • Forced Schedule • Remote Forced Occupied Signal • Internal Week Schedule • Push-Button Override Signal • Broadcast Week Schedule from GPC-XP The VCCX2 Controller can be forced into the Occupied Mode by inputting a Forced Schedule from any operator interface. Remote Forced Occupied Signal This Forced Occupied Input can be used in place of, or in conjunction with, the internal VCCX2 schedule. When this wet contact input closes, it will force the VCCX2 Controller into the Occupied Mode. When the Remote Forced Occupied Signal is removed, the controller will revert to the Unoccupied Mode of operation, or if an internal VCCX2 schedule is also being used, it will revert back to the current scheduled mode. Setting the Internal Week Schedule to ‘0’ will cause the controller to only look for the Remote Forced Occupied Signal for Occupied/Unoccupied commands. SEQUENCE OF OPERATIONS Supply Fan and Occupied/Unoccupied Operation

Internal Week Schedule An Internal Week Schedule, which supports up to two start/stop events per day and allows scheduling of up to 14 holiday periods per year is available for determining Occupied and Unoccupied schedules. It also allows for daylight saving configuration. Broadcast Schedule Eight external broadcast schedules are available with use of the GPC-XP Controller. Unoccupied Operation Uses Unoccupied Setback Offset Setpoints for heating and cooling calls. If Unoccupied Setback Setpoints are left at the default 30°F, no Unoccupied Setback operation will occur and the unit will be off. The Outdoor Air Damper will be closed except if the unit is in unoccupied Economizer Free Cooling Mode. If there is no call for Heating or Cooling, the unit will be off. HVAC Modes of Operation There are eight possible HVAC Modes of Operation. They are as follows: • Cooling Mode • Heating Mode • Vent Mode • Dehumidification Mode • Purge Mode • Heat Pump • Warm-Up Mode / Cool-Down Mode • Off Mode Cooling Mode Occupied Cooling is enabled when the temperature at the Mode Enable Sensor rises one deadband above the Cooling Setpoint. Cooling is disabled when the Mode Enable Temperature falls one deadband below the Cooling Setpoint. The setpoint and deadband are user-adjustable. Unoccupied Cooling operation is enabled when the Space Temperature rises above the Cooling Mode Enable Setpoint plus the Unoccupied Cooling Offset. Mechanical cooling is disabled if the Outdoor Air Temperature (OAT) falls 1°F below the Cooling Lockout Setpoint and will remain disabled until the OAT rises 1°F above the Cooling Lockout Setpoint. If the OAT disables mechanical cooling while it is currently operating, mechanical cooling will stage off as minimum run times and stage down delays are satisfied. If the economizer is enabled, it will function as the first stage of cooling (page 73). Cooling with the Refrigerant System Modules (RSMs) On units with digital or VFD compressors, the VCCX2 Controller will utilize one or more Refrigerant System Modules (RSMs). Units with only fixed staged compressors that are doing dehumidification or that require head pressure control would also utilize an RSM. Each RSM will control the compressors, condensers, and EXVs (on Bitzer VFD compressor units) for one or two refrigeration circuits. Up to four RSMs may be used in controlling up to eight circuits. The RSMD is used for digital compressor units, including heat pumps. The RSMV is used for Bitzer VFD compressor units (non heat pumps). The RSMV-HP is used for Bitzer VFD compressor units that are heat pumps. The RSMVC-P is used for Copeland VFD compressor units. In Cooling Mode, as the Supply Air Temperature (SAT) rises above the Active Cooling SAT Setpoint (page 80), the compressors will stage on and modulate to maintain the Active Supply Air Cooling Setpoint. Each RSM will independently control its compressors to achieve the most efficient cooling control. Each stage must meet its Minimum Off Time (adj.) before it is allowed to energize. Successive stages are subject to a Cooling Stage Up Delay (adj). Cooling stages will continue to run until the SAT falls below the Active Supply Air Temperature Setpoint minus the Cooling Stage Control Window and the cooling will begin to stage off. Each stage must meet its Minimum Run Time (adj.) before it is allowed to stage off. Successive stages are subject to a Cooling Stage Down Delay (adj.). See the appropriate RSM Technical Guide for a more detailed sequence of operation. Staged Cooling without the Refrigerant System Modules (RSMs) An RSM will not be used on units with fixed stage compressors that are not doing dehumidification and that do not require head pressure control, or on units with On/Off Chilled Water. In Cooling Mode, as the Supply Air Temperature (SAT) rises above the Active Supply Air Cooling Setpoint (page 80), cooling will begin to stage on. Each stage must meet its Minimum Off Time (adj.) before it is allowed to energize, and successive stages are subject to a Cooling Stage Up Delay (adj). SEQUENCE OF OPERATIONS HVAC Modes of Operation

Cooling stages will continue to run until the SAT falls below the Active Supply Air Temperature Setpoint minus the Cooling Stage Control Window at which point the cooling will begin to stage off. Each stage must meet its Minimum Run Time (adj.) before it is allowed to stage off and successive stages are subject to a Cooling Stage Down Delay (adj.). Modulating Chilled Water Cooling Control In the Cooling Mode, as the Supply Air Temperature (SAT) rises above the Active Supply Air Cooling Setpoint (page 80). The Modulating Cooling Proportional Window is used to determine the signal to the Chilled Water Valve and is user-adjustable. The Modulating Cooling signal is calculated based on the differential between the Supply Air Temperature and the Active Supply Air Temperature Setpoint based on the Modulating Cooling Proportional Window. The Maximum Signal Adjustment per time period is 10% and is not user-adjustable. The Minimum Signal Adjustment per time period is based on the Modulating Cooling Proportional Window. The larger the Modulating Cooling Proportional Window, the smaller the signal adjustment will be per time period. The time period is the delay between another increase or decrease in the Chilled Water Cooling Signal and is user-adjustable. For example, if the Modulating Cooling Proportional Window is 5°F, the signal would adjust 2% per °F each time period above or below the Active Supply Air Temperature Setpoint. When the Supply Air Temperature is above or below the Active Supply Air Temperature Setpoint by 5°F or more, the signal would adjust 10% each time period. SEQUENCE OF OPERATIONS HVAC Modes of Operation

Economizer Operation (Standard) NOTE: For Waterside Economizer Operation, see page 87. Economizer operation is enabled when the Outdoor Air (OA) drybulb, wetbulb, or dewpoint temperature falls below the Economizer Enable Setpoint by 1°F and if the Outdoor Temperature is at least 5°F below the Return Air Temperature (if that value is available). Economizer operation is disabled when the OA temperature rises 1°F above the Economizer Enable Setpoint. The Economizer acts as the 1st stage of cooling and controls to the Active Supply Air Cooling Setpoint. An Economizer Minimum Position can be programmed into the controller. During Economizer Operation, the economizer will modulate between this minimum position and 100%. If the economizer reaches 100% for two minutes and the Supply Air Temperature is still above setpoint, mechanical cooling is then allowed to stage up while the economizer is held at the full open position. Any time cooling stages are currently running, and the economizer becomes enabled, it will immediately open to 100%. During Heat and Vent Modes, the Economizer will remain at its minimum position. The only exception to this can occur during VAV Operation with Outdoor Air Temperature Control (VAV Tempering) (page 85). During Unoccupied Mode, the Economizer can be used for night setback free cooling; otherwise it will remain closed. IAQ (CO2) Override of the Economizer simply resets the Economizer Minimum Position higher. See IAQ (CO2) Control Operation section for more details. If utilizing the Title 24 Economizer option, an Economizer Feedback Signal (0-10 VDC) can be wired into the VCC-X EM1 Expansion Module for status monitoring. Several Title 24 alarm conditions can also be displayed and are listed in the Alarms section of this manual. Economizer Override Via BACnet® As stated above, the economizer must reach and remain at 100% before compressors will be allowed to stage on to meet the Cooling Supply Air Setpoint. Because of this 100% requirement, if a value of less than 100% is written to BACnet® point AV:70 (Outdoor Air Damper Override) while compressors are operating, the controller effectively recognizes this as the economizer being active at less than 100% – so the compressor(s) will disable. To avoid the economizer being disabled but compressors are enabled, AV: 49 (Minimum Economizer Position) can be used. This will change the minimum position, while allowing compressors to remain on. However, if using AV:49 and the economizer operation is enabled, the damper can open more than the minimum position for true economizer operation. Comparative Enthalpy Economizer Operation A Comparative Enthalpy Economizer option is also available. The E-BUS Outdoor Temperature/Humidity Sensor and the E-BUS Return Air Temperature/Humidity Sensor must be used for this operation to be available. If the Outdoor Enthalpy is below the Comparative Economizer Enable Setpoint by the Comparative Economizer Enable Deadband amount, and the Outdoor Enthalpy is less than the Return Air Enthalpy by the Comparative Economizer Enable Deadband amount, then Economizer Operation will be enabled to act as the first stage of Cooling. If the Outdoor Enthalpy rises above the Comparative Economizer Enable Setpoint by the Comparative Economizer Enable Deadband amount or if the Outdoor Enthalpy rises above the Return Air Enthalpy by the Comparative Economizer Enable Deadband amount, then Economizer Operation will be disabled. SEQUENCE OF OPERATIONS Economizer Operation

Dehumidification Mode On VAV, CAV, Single Zone VAV, and High Percentage Outdoor Units with Space Temperature Control, the Dehumidification Mode is initiated when the Indoor Humidity rises above the Indoor Humidity High Reset Source Setpoint. The unit will leave the Dehumidification Mode when the humidity falls below the Indoor Humidity Low Reset Source Setpoint. On 100% Outdoor Air (MUA) units with Outdoor Air Temperature Control, Dehumidification is initiated when the Outdoor Air Dewpoint rises above the Outdoor Air Dewpoint Setpoint by 2°F. The unit will leave the Dehumidification Mode when the humidity falls 2°F below this setpoint. The Outdoor Air Dewpoint is calculated using the Outdoor Air Temperature and the Outdoor Air Humidity There are four configuration options for Dehumidification operation. Occupied Vent Mode Only: Dehumidification can only be initiated in the Occupied Mode when there is no call for Heating or Cooling. This creates a Vent Dehumidification Mode. Both Occupied and Unoccupied Vent Mode: Dehumidification can be initiated in the Occupied and Unoccupied Modes when there is no call for Heating or Cooling. This creates a Vent Dehumidification Mode. NOTE: Do not use this option on a MUA unit that does not have return air and is not configured for space controlled Night Setback operation. Damage to the unit could occur since the OA damper remains closed in the Unoccupied Mode. All Modes while Occupied: Dehumidification can be initiated anytime in the Occupied Mode during Cooling, Heating, or Vent Mode. This can create a Cooling Dehumidification Mode, a Heating Dehumidification Mode, or a Vent Dehumidification Mode. All Modes while Occupied and Unoccupied: Dehumidification can be initiated anytime in the Occupied or Unoccupied Mode during Cooling, Heating, Vent, or Off Mode. This can create a Cooling Dehumidification Mode, a Heating Dehumidification Mode, or a Vent Dehumidification Mode. Any calls for Unoccupied Dehumidification use the same Dehumidification Setpoint as during the Occupied Mode since you never want humidity to get out of control. Dehumidification Operation on DX Compressor Units Any DX unit doing dehumidification will utilize one or more Refrigerant System Modules (RSMs). Each RSM will control the compressors, condensers, and EXVs (on Bitzer VFD compressor units) for one or two refrigeration circuits. Up to four RSMs may be used in controlling up to eight circuits. The RSMD is used for digital compressor units, including heat pumps. The RSMV is used for Bitzer VFD compressor units (non heat pumps). The RSMV-HP is used for Bitzer VFD compressor units that are heat pumps. The RSMVC-P is used for Copeland VFD compressor units. In the Dehumidification Mode, the compressors are controlled to maintain the Suction (Saturation) Temperature Setpoint. Each RSM will independently control its compressors to achieve the most efficient dehumidification control. See the appropriate RSM Technical Guide for a more detailed sequence of operation. CAUTION: If the Coil Saturated Temperature drops below 32˚F, any cooling remaining on will be forced to stage off. During Dehumidification, the Economizer will be held to its minimum position. If the unit will be using the CAV/MUA Dual Mode (Hood On/Off) Operation, Dehumidification will require the use of an Outdoor and Indoor Humidity Sensor. Dehumidification Operation on Chilled Water Units For Chilled Water units, the VCCX2 Controller will open the Chilled Water valve to a fixed 100% position to provide full moisture removal capability. NOTE: Do not use this option on a MUA unit that does not have return air and which is not configured for space controlled Night Setback operation. Damage to the unit could occur since the OA damper remains closed in the Unoccupied Mode. NOTE: Compressor operation is subject to the Outdoor Air Temperature Cooling Lockout during Dehumidification. SEQUENCE OF OPERATIONS Dehumidification Mode

Reheat During the Dehumidification Mode, the VCCX2 activates Cooling to extract moisture from the Supply Air and utilizes either Modulating Hot Gas Reheat, On/Off Hot Gas Reheat, or Heating to reheat the Supply Air. Hot Gas Reheat is the standard form of Reheat. Reheat is always controlled to the Active Supply Air Setpoint (see the Supply Air Temperature Setpoint Reset section for further explanation) which will be different depending on whether the unit is in Cooling Mode Dehumidification, Heating Mode Dehumidification, or Vent Mode Dehumidification. During Cooling Dehumidification, Reheat is controlled to the Active Cooling Supply Air Setpoint. During Heating Dehumidification, Reheat is controlled to the Active Heating Supply Air Setpoint. During Vent Dehumidification, Reheat is controlled to a calculated setpoint that is halfway between the Heating and Cooling Mode Enable Setpoints. If the unit is equipped with a MHGRV-X, then during Dehumidification, it will modulate the reheat valve to maintain the Supply Air Temperature at the Active Supply Air Temperature Setpoint. If the unit is equipped with an On/Off Hot Gas Valve, then one of the relays will be configured for Reheat. The Reheat Relay will be activated if the SAT is less than the SAT Setpoint. The Hot Gas Reheat Relay will remain on during the Dehumidification Mode regardless of the Supply Air Temperature. This is to ensure a steady Supply Air Temperature. The HVAC unit’s Heat Source, Heat Pump Auxiliary Heat, or a Heat Source located in the Supply Air Duct (which is used as the unit’s Heat source) can be used for Reheat if the unit is not equipped with Hot Gas Reheat or to supplement Hot Gas Reheat. WARNING: Simultaneous Heating and Cooling cannot be approved unless the HVAC unit has been specifically designed for this purpose. A Special Price Authorization (SPA) must be obtained from the AAON® factory for these applications to avoid warranty and/ or rating problems. AAON assumes no liability for any Simultaneous Heating and Cooling application if a SPA is not obtained from the AAON® Factory at the time the HVAC unit is ordered. When Unit Heat is used for Reheat instead of Hot Gas Reheat, the VCCX2 can activate the Heat Source(s) discussed in the Heating Mode section to maintain the Supply Air Temperature at the Active Supply Air Temperature Setpoint. When Unit Heat is used to supplement Modulating Hot Gas Reheat, the Modulating Hot Gas Reheat Signal must reach 100% before Heating will be enabled to add additional Reheat. Coil Suction (Saturated) Temperature Reset The Indoor Humidity can be used to reset the Coil Saturated Temperature Setpoint. A user adjustable range of Indoor Humidity values can be used to reset the Coil Saturated Temperature Setpoint between a user adjustable range of values. As the Indoor Humidity rises within its range the Coil Saturated Temperature Setpoint will be lowered within its range. Return Air Bypass Damper Control The Return Air Bypass (RAB) Damper is only used on constant volume units with space temperature or return air temperature configured as the HVAC Mode Enable sensor. The RAB Damper is only active during the Dehumidification Mode and is used as the first form of Reheat. If the HVAC unit is equipped with Modulating Hot Gas Reheat, the RAB Damper needs to be at 100% before the Modulating Hot Gas Reheat can be used. The RAB Damper modulates from 0-100% as the Space (or Return Air) Temperature falls below the Cooling Setpoint. When the Space (or Return Air) Temperature is equal to the Cooling Setpoint, the RAB Damper will be at 0%. When the Space (or Return Air) Temperature falls to halfway between the Cooling and Heating Setpoints, the RAB Damper will be at 100%. If the HVAC unit is equipped with separate actuators for the Outdoor Air and Return Air Dampers, the Return Air Damper will proportionally close more as the RAB Damper opens. The rate at which the Return Air Damper closes is user-adjustable. The purpose of closing the Return Air Damper more as the RAB Damper opens is to allow more air to bypass the evaporator coil through the RAB Damper. If you want more air to pass through the RAB Damper, enter a larger number in the Return Air Damper Factor Setpoint. If you want less air to pass through the RAB Damper, enter a smaller number in the Return Air Damper Factor Setpoint. SEQUENCE OF OPERATIONS Reheat, Coil Suction, and Return Air Bypass Damper

Heating Mode Available heating options are Staged Gas, Modulating Gas, Staged Electric, On/Off Hot Water, Modulating Hot Water, and Modulating SCR Electric. Occupied Heating is enabled when the temperature at the Mode Enable Sensor falls one deadband below the Heating Setpoint. Heating is disabled when the Mode Enable temperature raises one deadband above the Heating Setpoint. Unoccupied Heating operation is enabled when the Space Temperature falls below the Heating Mode Enable Setpoint minus the Unoccupied Heating Offset. In the Heating Mode, as the Supply Air Temperature falls below the Active Supply Air Heating Setpoint (page 80), the heating will begin to stage on or to modulate. Each stage must meet its Minimum Off Time (adj.) before it is allowed to energize, and successive stages are subject to a Heating Stage Up Delay (adj). Heating stages will continue to run until the Supply Air Temperature rises above the Active Supply Air Temperature Setpoint plus the Heating Stage Control Window at which point the heating will begin to stage off. Each stage must meet its Minimum Run Time (adj.) before it is allowed to stage off, and successive stages are subject to a Heating Stage Down Delay (adj.). Mechanical heating is disabled if the Outdoor Air Temperature (OAT) rises 1°F above the Heating Lockout Setpoint and will remain disabled until the OAT falls 1°F below the Heating Lockout Setpoint. If the OAT disables mechanical heating while it is currently operating, mechanical heating will stage off as minimum run times and stage down delays are satisfied. Modulating Heating The VCCX2 supports various forms of Modulating Heat such as SCR Electric Heat, Modulating Hot Water Heat, and Modulating Steam Heat. This references Modulating Heat that is controlled from AOUT3 on the VCCX2 Controller with a user-adjustable voltage range between 0-10 VDC. Modulating Gas, which is controlled by the MODGAS-X Module, is not included in this section. Whichever form of Modulating Heating is used, the VCCX2 will modulate the Heat Source to achieve the Active Supply Air Temperature Setpoint. The Modulating Heating Proportional Window is used to determine the signal to the Modulating Heating Source and is user-adjustable. The Modulating Heating Signal is calculated by the differential between the Supply Air Temperature and the Active Supply Air Temperature Setpoint based on the Modulating Heating Proportional Window. The maximum signal adjustment per time period is 10% and is not user-adjustable. The minimum signal adjustment per time period is based on the Modulating Heating Proportional Window. The larger the Modulating Heating Proportional Window, the smaller the signal adjustment will be per time period. The time period is the delay between another increase or decrease in the Modulating Heating Source Signal and is user-adjustable. For example, if the Modulating Heating Proportional Window is 5°F, the signal will be adjusted 2% per °F each time period above or below the Active Supply Air Temperature Setpoint. When the Supply Air Temperature is above or below the Active Supply Air Temperature Setpoint by 5°F or more, the signal will adjust 10% each time period. Hot Water Coil Protection NOTE: Unless the following sequence is utilized, the Hot Water Valve is closed (regardless if configured for direct or reverse acting control) when not being used for Heating. Fan On Mode If anytime the fan is on, the Supply Air Temperature falls below the user-adjustable Low Supply Air Temperature Cutoff Setpoint for at least one minute, the Hot Water Valve will move to a user-adjustable position configured with the Hot Water Valve Protection Position Setpoint. If the Supply Air Temperature rises above the Low Supply Air Cutoff by 5°F, the valve will return to its normal position. If the Supply Air Temperature remains below the Low Supply Air Temperature Cutoff Setpoint for ten minutes, the unit will then shut down and the Low Supply Air Temperature Cutoff Alarm will be generated. If the Supply Air Temperature rises above the Low Supply Air Cutoff by 5°F, the alarm (if generated) will clear and the unit will attempt to restart and resume normal operation. Fan Off Mode If anytime the fan is off, the Outdoor Air Temperature falls below the user-adjustable Low Ambient Setpoint, the Hot Water Valve will move to the user-adjustable Hot Water Valve Protection Position Setpoint. If the Outdoor Temperature rises above the Low Ambient Setpoint, the valve will return to its normal position. If the Hot Water Valve Protection Position setpoint is left at the default of 0%, the controller will not initiate this protection sequence. This operation works during Emergency Shutdown. SEQUENCE OF OPERATIONS Heating Mode

Primary Modulating Heat with Secondary Staged Heat The Modulating Heat source can be Modulating Gas, Modulating Hot Water, Modulating Steam, or SCR Electric Heat. In this case the Modulating Heat will be the first form of heat used and will e to attempt to achieve the Active Supply Air Heating Setpoint. If the modulating heat reaches 100%, the Heating Stage Up Delay begins. If the Primary Heat Source is still at 100% after the Heating Stage Up Delay expires, the Secondary Heat Source will activate. The Primary Heat Source can then modulate as necessary to achieve the Active Supply Air Heating Setpoint. If there are additional stages of heat, they will stage up as described, with the Primary Heat Source modulating as necessary. If the Secondary Heat Source is activated and the Primary Heat Source has modulated to 0%, the Heating Stage Down Delay will begin. If the Primary Heat Source is still at 0% after the Heating Stage Down Delay expires, the Secondary Heat Source will deactivate. If there are multiple stages of Secondary Heat, they will stage off in the same manner. Then, if the Supply Air Temperature rises above the Active Supply Air Heating Setpoint plus the Heating Stage Control Window, the Primary Heat Source will modulate to 0% to allow the Supply Air Temperature to cool off. Ventilation Mode This mode is only available in the Occupied Mode of operation on units configured for continuous Supply Fan operation and is generated anytime there is no demand for heating or cooling. The fan will operate at the configured Minimum Vent speed. Off Mode Off Mode occurs in the Unoccupied Mode when there is no heating or cooling demand. The Supply Fan is off and the outside air damper is closed. Off Mode can only occur in the Occupied Mode if the fan is configured to cycle with heating and cooling and there is no call for heating or cooling. Remote Contact Control A Remote Contact Control option can be configured on the VCCX2 Controller to initiate the HVAC Modes of operation. If this option is configured, all Heating, Cooling, and Dehumidification modes will only be initiated based on 24 VAC wet contact closures on the Forced Heating, Forced Cooling, and Forced Dehumidification inputs on the VCCX2 Controller. This is a single configuration option that applies to all three modes. If both the Forced Heating and Forced Cooling inputs are inactive or if both are simultaneously active, then the unit is in Vent Mode state. In this condition in the Occupied Mode, only the fan would be on for ventilation. In this condition in the Unoccupied Mode, the unit would just be off. If Forced Dehumidification is also being used, it will operate in conjunction with the Forced Heating and Forced Cooling inputs according to which Dehumidification option you have configured. The four configuration options are described in the Dehumidification Mode section on page 74. Space Sensor Operation Space Sensors are available as a Plain Sensor, Sensor with Override, Sensor with Slide Adjust, and Sensor with Override and Slide Adjust (this is the version that is factory supplied). An E-BUS Digital Space Sensor is also available with override and setpoint adjustment capability. Sensors with Slide Adjust can be programmed to allow Space Setpoint adjustment of up to ± 10° F. If the Space Temperature is the SAT/Reset Source, then the Slide Adjust will adjust the HVAC Mode Enable Setpoints and the SAT/Reset Source Setpoints simultaneously. During Unoccupied hours, the Override Button can be used to force the unit back into the Occupied Mode (by pressing the button for less than three seconds) for a user-defined override duration of up to 8.0 hours. Pressing the button between three to 10 seconds cancels the override. SEQUENCE OF OPERATIONS Ventilation Mode, Remote Contact Control, and Space Sensor Operation

Multiple Digital Space Sensors Multiple (up to 10) digital space sensors can be connected to the VCCX2 Controller in applications where multiple spaces (not utilizing VAV boxes) could be served by a single unit. These sensors can be either the E-BUS Digital Space Temperature Sensor or the E-BUS Digital Space Temperature/Humidity Sensor. The VCCX2 can be configured to use temperature (high and low) to determine the Cooling or Heating Mode or average the space temperature values and use that value to determine the mode of operation – in both cases relative to the VCCX2 Space Temperature Setpoints. It would use the highest humidity value relative to the Space Humidity Setpoint to initiate Dehumidification Mode. The digital sensors each need to be configured with unique addresses (#1 -10) for this operation. In this arrangement, only the sensor at address #1 can utilize the slide adjust. All push-button overrides on the sensors will function. Each sensor can have its own calibration offset, if required. SEQUENCE OF OPERATIONS Ventilation Mode, Remote Contact Control, and Space Sensor Operation

IAQ (CO2) Control Operation If you have configured the VCCX2 Controller to monitor and control CO2 levels, the Economizer operation will be modified as follows: 1. If the CO2 levels remain below the Low CO2 Level Setpoint, the Economizer Minimum Position (or Airflow Minimum) will remain at its configured value. 2. As the level of CO2 increases above the Minimum CO2 Level Setpoint, the Economizer Minimum Position (or Airflow Minimum) will begin to be reset higher. The Economizer Minimum Position (or Airflow Minimum) will be proportionally reset higher as the CO2 rises within the range set by the Minimum CO2 Level Setpoint and the Maximum CO2 Level Setpoint. If the CO2 level reaches the High CO2 Level Setpoint, the Economizer Minimum Position (or Airflow Minimum) will be reset to the Maximum Reset Position. 3. The Maximum Reset Position Setpoint is the highest the Economizer Minimum Position (or Airflow Minimum) can be reset to during CO2 Control Operation. This setpoint is user-adjustable and does not keep the Economizer from opening further during Economizer operation. Morning Warm-Up Mode Operation NOTE: Morning Warm-Up can be configured for any application but should not be used on 100% Outdoor Air Units, since the Outdoor Air Damper remains closed during Warm-Up. When the VCCX2 Controller is configured for Morning Warm- Up and switches to the Occupied Mode of Operation (not Override or Force Mode from an operator interface device), the unit compares the Return Air Temperature to a Morning Warm- Up Target Temperature. If the Return Air Temperature is below this setpoint, the Warm-Up Mode is initiated. Heating will then be controlled to the Warm-Up Supply Air Temperature Setpoint. This mode remains in effect until the Return Air Temperature rises above the Target Temperature or a user-adjustable time period expires. Warm-Up Mode is not initiated by Push-Button Overrides or Unoccupied Heating demands. The Outdoor Air Damper remains closed during Warm-Up Mode. Once the Warm-Up Mode has been terminated, it cannot resume until the unit has been through a subsequent Unoccupied Mode. Only one Warm-Up Mode is allowed per Occupied cycle. If you have stand-alone VAV boxes that need to be forced wide open during the Warm-Up Mode, you can configure one of the relay outputs to be used during this Mode. If the Warm-Up Mode is active, the relay is activated. This relay then becomes the Force Open Command for all VAV boxes to which it is wired. Morning Cool-Down Mode Operation When the VCCX2 Controller is configured for Morning Cool- Down and switches to the Occupied Mode of Operation (not Override or Force Mode from an operator interface device), the unit compares the Return Air Temperature to a Morning Cool- Down Target Temperature. If the Return Air Temperature is above this Setpoint, the Cool-Down Mode is initiated. Cooling will then be controlled to the Cool-Down Supply Air Temperature Setpoint. This mode remains in effect until the Return Air Temperature drops below the target temperature or a user-adjustable time period expires. Cool-Down Mode is not initiated by Push-Button Overrides or Unoccupied Cooling demands. The Outdoor Air Damper remains closed during Cool-Down Mode. Once the Cool-Down Mode has been terminated, it cannot resume until the unit has been through a subsequent Unoccupied Mode. Only one Cool-Down Mode is allowed per Occupied cycle. If you have stand-alone VAV boxes that need to be forced wide open during the Cool-Down Mode, you can configure one of the relay outputs to be used during this mode. If the Cool-Down Mode is active, the relay is activated. This relay then becomes the Force Open Command for all VAV boxes to which it is wired. Single Zone VAV Single Zone VAV is an application where the Supply Fan VFD modulates to maintain the Space Temperature Setpoint while heating or cooling is modulated to maintain the Supply Air Setpoint. This application can be configured to use VAV Cooling and either VAV Heating or CAV Heating. There is no Supply Air Temperature Setpoint reset function on a Single Zone VAV Unit. VAV Cooling and VAV Heating require modulating cooling and heating sources in order to maintain a constant Supply Air Temperature no matter what the fan speed is. CAV Heating must be configured if using a staged form of heat. The Space Temperature Sensor (cannot use Return Air Temperature) determines the heating or cooling mode of operation. Heating and cooling are enabled and disabled as described previously in the Heating (page 76) and Cooling sections (page 71). SEQUENCE OF OPERATIONS IAQ Control, Morning Warm-Up and Cool-Down, and Single Zone VAV

In the Cooling Mode, the modulating cooling source will modulate to maintain the Cooling Supply Air Setpoint. The Supply Fan VFD will begin operation at a user-adjustable Minimum VFD Cooling Speed (30% default) and modulate between this setpoint and 100% as needed to maintain the Space Temperature within the Space Cooling Reset Window created by configuring a Space Cooling High and a Space Cooling Low Reset Source Setpoint. If the unit is configured for VAV Heating, then in the Heating Mode the modulating heating source will modulate to maintain the Heating Supply Air Setpoint. The Supply Fan VFD will begin operation at a user-adjustable Minimum VFD Heating Speed (50% default) and modulate between this setpoint and the Maximum VFD Heating Speed (100% default) as needed to maintain the space temperature within the Space Heating Reset Window created by configuring a Space Heating High and a Space Heating Low Reset Source Setpoint. If the unit needs to be configured for CAV Heating, set the Minimum VFD Heating Speed to be the same as the Maximum VFD Heating Speed desired during heating (page 76). Once the unit enters the Heating Mode, the Supply Fan will run at the set Maximum VFD Heating Speed (100% default). In the Vent Mode of operation, the Supply Fan will operate at the VFD Vent Speed (user-adjustable). During Dehumidification, the fan will operate as described above, depending on if the Space Temperature is calling for Cooling Dehumidification or Heating Dehumidification. When the controller is in the Vent-Dehumidification Mode, the Supply Fan VFD will still modulate based on the Space Temperature. It looks at a temperature half way between the Cooling and Heating setpoints and modulates between the Cooling minimum and 100% as the Space Temperature goes from the midway value to 0.5°F above that value. For example, if the Cooling Enable Setpoint is 74°F, the Heating Enable Setpoint is 70°F, and the Space Temperature is 72°F or less, the Supply Fan will be running at the cooling minimum. As the Space Temperature rises to 72.5°F, the fan will go to 100%. Night Setback operation uses the same SZ VAV fan control logic; however, since the setbacks would normally be larger than the space reset range for the fan speed, the fan will typically always be at 100%. If the Hood On/Off operation is used on a SZ VAV unit, then during Hood On, the mode enable will switch to the Outdoor Air Temperature Sensor using Hood On Mode Enable Setpoints and the Outdoor Air Damper will modulate to 100%. The Supply Fan VFD will modulate to 100%. Supply Air Temperature Setpoint Reset Various sources can be configured to reset the Supply Air Temperature (SAT) Setpoint. Since the Supply Air Temperature Setpoints are not fixed during reset, we refer to them as “Active Supply Air Temperature Setpoints.” The following Reset Source options are available in this release: 1. Space Temperature 2. Outdoor Air Temperature 3. Return Air Temperature 4. Fan VFD Signal 5. Remote SAT Reset Signal For whatever option is selected, a High and a Low Reset Source Setpoint must be configured that will correspond to configured Low and High SAT Setpoints. This must be done separately for the Cooling Mode Setpoints and for the Heating Mode Setpoints. When the Reset Source is at its highest configured setpoint, the SAT Setpoint will be reset to its lowest configured setpoint. When the Reset Source is at its lowest configured setpoint, the SAT Setpoint will be reset to its highest configured setpoint. In all cases, as the Reset Source value moves within its range established by the configured High and Low Reset Setpoints, the Supply Air Setpoint will be proportionally reset within its range established by the configured Low and High SAT Setpoints. If a Remote SAT Reset Signal is configured as the Reset Source, a configurable voltage signal (between 0 and 10 VDC, direct or reverse acting) can be used to reset the Supply Air Temperature Setpoint. You can configure what voltage will correspond to the Low SAT Setpoint and what voltage will correspond to the High SAT Setpoint in both the Heating and the Cooling Modes. NOTE: This Supply Air Temperature reset cannot be used on a Single Zone VAV Unit. SEQUENCE OF OPERATIONS IAQ Control, Morning Warm-Up and Cool-Down, and Single Zone VAV

Airflow Monitoring Outdoor, Supply, Return and Exhaust Airflow can be monitored using the EBTRON® GTC116 or HTN104 series, Paragon MicroTransEQ series, or GreenTrol™ GA-200-N Module in conjunction with a GreenTrol™ GF series of airflow station. Contact AAON Controls for information on other airflow station options. The VCCX2 will control the Outdoor Air Damper to maintain an Outdoor Air CFM Setpoint. This operation can be overridden higher by normal Economizer control. On an MUA unit or a unit configured for Space Control of High Percentage Outdoor Air, since the damper is typically at 100%, the VCCX2 can be configured to modulate the Supply Fan VFD to maintain an Outdoor CFM Setpoint. Preheater Operation A Preheat Relay can be configured to energize anytime the Supply Fan is operating and the Outdoor Air Temperature is below the Preheat Setpoint. This option allows preheating of cold outside air before it reaches the evaporator coils and is useful in Hot Water/Chilled Water applications or during CO2 control of the economizer in low temperature conditions. This operation only occurs in the Occupied Mode. If using the PREHEAT-X, an SCR Preheater and/or stages of Preheat can be controlled. If the Entering Air Temperature (sensor connected to the PREHEAT-X) falls below the Preheat Setpoint, then Preheat will be controlled to either a Cooling, Heating or Vent Mode Preheater Leaving Air Setpoint - depending on if the VCCX2 is currently in the Cooling, Heating, or Vent Mode. These setpoints are all set in the VCCX2 Controller. If using the PREHEAT-X in conjunction with the VCCX2 Controller, the Entering Air Temperature on the PREHEAT-X (instead of the Outdoor Air Temperature Sensor connected directly to the VCCX2 Controller) will be used as the temperature that locks out compressors. See the PREHEAT-X Controller Technical Guide for more details. Low Ambient Operation A Low Ambient Relay can be configured. Whenever the Outdoor Air Temperature falls below the Low Ambient Setpoint, this Low Ambient Relay will energize. This operation occurs in both the Occupied and Unoccupied Modes of Operation. Heat Wheel One of the relay outputs can be configured as a Heat Wheel Relay. This relay will enable the Heat Wheel when the unit goes into the Occupied Mode. If the unit is a recirculating unit configured to use Economizer free cooling, the relay will disable during Economizer operation. If the unit is a 100% outdoor air unit configured to use the Outdoor Air Sensor as the controlling sensor, then the Heat Wheel Relay will disable in between the Outdoor Air Cooling and Heating Mode Enable Setpoints (Outdoor Air Vent Mode). Similarly, on a unit configured for Space Control of High Percentage Outdoor Air, and the unit is in Outdoor Air Vent Mode, the wheel is disabled. The controller can also be configured to disable the Heat Wheel Relay between High and Low Outdoor Air Enthalpy Setpoints. Heat Wheel Defrost A Defrost Mode will occur if the Heat Wheel relay is active, the Outdoor Temperature is below the Heat Wheel Defrost Setpoint, and 30 minutes have elapsed since the last Defrost Mode. The Defrost Mode will disable the Heat Wheel Relay for 2 minutes. Before the Heat Wheel Relay disables, a 2-minute delay will occur while the Economizer closes to a 10% position to allow the return air to have maximum defrost effect on the wheel. At the end of the Defrost Mode, the Heat Wheel Relay will enable, and the economizer will return to its normal position. This 10% re-positioning will not occur on units configured for MUA control (outdoor air is the controlling sensor), or for units in Hood-On operation, or for units that are configured for Space Temperature Control of a high percentage of outdoor air. Duct Static Pressure Control If the VCCX2 Controller has been configured for Duct Static Pressure Control, then anytime the Supply Fan is operating, the unit will be controlling to a Duct Static Pressure Setpoint. The Static Pressure Control Output Signal can be used to control a Supply Fan VFD (Direct Acting Operation), or a Zoning or Bypass Damper Actuator (Reverse Acting Operation). The Duct Static Pressure Setpoint, the Setpoint Deadband, the Static Pressure Control Signal, and the Static Control Rate are all user-adjustable. The Static Control Rate is the amount of time that elapses between each adjustment to the Duct Static Pressure Control Output Signal. The default period is 10 seconds and should not be changed unless close observation reveals that the Supply Fan or Bypass Damper is hunting and not maintaining a stable pressure reading. For Supply Fan VFD operation, the Output Signal increases (increases the VFD speed) if the Duct Static Pressure is below the Duct Static Pressure Setpoint by the Deadband amount, and the Output Signal decreases (decreases VFD Speed) if the Static Pressure is above the Setpoint by the Deadband amount. SEQUENCE OF OPERATIONS Airflow Monitoring, Preheater, Low Ambient and Duct Static Press

For Bypass Damper operation, the VCCX2 will reverse the logic of the Output Signal. The Output Signal decreases (closes the Zoning Bypass Damper) if the Duct Static Pressure is below the Duct Static Pressure Setpoint by the Deadband amount, and the Output Signal increases (opens the Zoning Bypass Damper) if the Duct Static Pressure is above the Duct Static Pressure Setpoint by the Deadband amount. If the Static Pressure ever rises 0.5” W.C. above the Duct Static Pressure Setpoint, the Duct Static Pressure Control Output Signal value will be cut by .15” W.C. every control period until the Static Pressure is brought under control. This is to prevent damage to the ductwork if all the VAV boxes are closed or some other blockage occurs in the ductwork. WARNING: The manufacturer does not assume responsibility for protecting the equipment from over-pressurization. You should always install mechanical high static protection cutoffs to protect your system. Any time the Supply Fan is off, the Duct Static Pressure Control Output Signal will remain at 0 V. If Duct Static Pressure Control is not configured, the Static Pressure can still be monitored if a Static Sensor is installed, however, no control will occur. Duct Static Setpoint Reset If the VCCX2 Controller is being used with AAON VAV box controllers in a VAV system, the Duct Static Pressure Setpoint can be dynamically reset based on the most-open VAV box associated with that unit. As long as the most-open box is less than 80% open, the Duct Static Setpoint will be decrease at a user-adjustable Reset Rate from the Max Static Pressure Reset Limit Setpoint down to the Minimum Static Pressure Reset Limit. Once the most-open box exceeds 80%, the setpoint will increase toward the Maximum Static Pressure Reset Limit Setpoint. A MiniLink PD 5 is required in order to poll the VAV boxes for their damper position. Duct Static Pressure Control for Filter Loading In order to maintain a constant CFM through the supply air ducts on a mixed air CAV unit, the VCCX2 can utilize a Duct Static Pressure Sensor (used to monitor the discharge pressure) in conjunction with a Supply Fan VFD. If the filters are getting dirty, the VCCX2 will ramp up the VFD to compensate for the decrease in airflow. To utilize this feature, the unit must be configured to use VFD Fan Control. This feature cannot be used if this is a VAV or Zoning application with typical Duct Static Pressure Control, or if this unit has been configured for Single Zone VAV operation. SEQUENCE OF OPERATIONS Duct Static Setpoint Reset and Duct Static Pressure Control

Building Pressure Control The VCCX2 can maintain Building Static Pressure anytime the Supply Fan is operating. A Building Pressure Transducer must be connected to the VCCX2 Controller. The following are the available control options. Direct Acting Building Pressure Control • On/Off Exhaust Fan: If an On/Off Exhaust Fan is being used, a relay output must be configured for “Exhaust Fan”. This relay will energize whenever the Building Pressure rises above the Building Pressure Setpoint by the Deadband amount. The relay will de-energize when the Building Pressure falls below the Building Pressure Setpoint by the Deadband amount. • Exhaust Fan VFD or Modulating Exhaust Damper: If configured for Modulating Exhaust, a user-adjustable voltage output (AOUT4 – Building Pressure Output) will be used to control this fan or damper. An Exhaust Relay can be configured if necessary to enable the fan or damper. Whenever the Building Pressure rises above the Building Pressure Setpoint by the Deadband amount, the Exhaust Fan Relay will energize and the Modulating Signal will activate to control to the Building Pressure Setpoint. If the Building Pressure falls below the Building Pressure Setpoint by the Deadband amount, the Modulating Signal will modulate towards 0% as it attempts to maintain the Building Pressure Setpoint. The Exhaust Fan Relay is energized whenever the Modulating Signal is above 0%. Reverse Acting Building Pressure Control • Outdoor Air Damper: If this option is configured, the VCCX2 will use the user-adjustable Economizer/ Outdoor Air Damper output signal (AOUT2 – Economizer Control Signal) to maintain the Building Pressure Setpoint. Whenever the Building Pressure falls below the Building Pressure Setpoint by the Deadband amount, the modulating Economizer Output Signal will modulate the damper open to control to the Building Pressure Setpoint. If the Building Pressure rises above the Building Pressure Setpoint by the Deadband amount, the damper will modulate towards closed as it attempts to maintain the Building Pressure Setpoint. When this option is selected, no Economizer free cooling or CO2 IAQ operation will be available. NOTE: If Reverse Acting Building Pressure Control using the Outdoor Air Damper is configured, the Hood On Input is ignored and will not drive the Outdoor Air Damper open. • Supply Fan VFD: Careful consideration should be made regarding the effects of potential reduced airflow when using this option. If this option is selected, the Supply Fan VFD Output (AOUT1 - Main Supply Fan VFD) will be used to control the Supply Fan VFD to maintain the Building Pressure Setpoint in similar fashion to the Outdoor Air Damper control described above. Return Plenum Pressure Control The VCCX2 Controller can control the Return Plenum Pressure using a motorized exhaust damper. This is used on certain RNZ units that have a return fan that will be used to control Building Static Pressure. This sequence will require the use of the VCC-X EM1 Expansion Module which has an input for a Return Plenum Pressure Transducer (the same transducer used for the Building Pressure control) and an analog output that is wired to the actuator used to control the motorized exhaust damper. When the return fan is active (based on Building Pressure) the motorized exhaust damper will modulate to control the Return Plenum Pressure Setpoint. If the pressure is above the setpoint the modulating signal will move towards 100%. If the pressure is below setpoint the modulating signal will move towards 0%. Exhaust Duct Static Pressure Control of Exhaust Fan The VCCX2 Controller can control an exhaust fan based off of exhaust duct static pressure. This sequence will require the use of the VCC-X EM1 Expansion Module which has a modular jack that the Duct Static Pressure Sensor will plug into. The building pressure output will be used to control the exhaust fan for this operation. A standard pull-through exhaust fan creates negative duct static pressure. Since a duct static pressure sensor reads positive pressure, this sequence requires the tubing for the sensor to be reversed so that the low side is in the exhaust ductwork. So, although the user is actually controlling to a negative pressure, the VCCX2 will be configured to use (and will display) an equivalent positive Exhaust Duct Static Pressure Value and Setpoint. So, if the duct static pressure is below setpoint, the control signal will ramp up. See the VCCX2 Controller Operator Interfaces SD Technical Guide for the Setpoint and Deadband ranges associated with this control. The Control Rate is the same as the Control Rate configured for the Supply Duct Static Pressure control. SEQUENCE OF OPERATIONS Building Pressure Control and Exhaust Duct Static Pressure Control

MUA Operation Occupied Mode: The VCCX2 will use the normal Cooling and Heating Mode Enable Setpoints (not the Hood On Setpoints) in conjunction with the Outdoor Air Temperature Sensor to determine the mode of operation. The Outdoor Air Dewpoint Setpoint will initiate the Dehumidification Mode. The Outdoor Air Damper will be modulated to the Economizer Minimum Damper Position (normally set at 100% for a MUA unit). Unoccupied Mode: Normally, an MUA unit is off during the Unoccupied Mode. However, if the unit has Return Air, it can be configured to operate as a recirculating Night Setback controlled unit during unoccupied hours. This is accomplished by simply configuring Night Setback Temperature Setpoints (anything other than the default 30ºF) on a unit that is also configured for outdoor temperature control (MUA). With this configuration, when the unit goes Unoccupied, it will close the Outdoor Air Damper and begin to use a Space Temperature Sensor in conjunction with the existing Heating and Cooling Setpoints, offset by the Night Setbacks, to make Night Setback calls. If a Space Humidity Sensor is installed, and the unit is configured for Night Humidity control, the VCCX2 Controller will use the Space Humidity Setpoint for Unoccupied Dehumidification calls. CAV/MUA Dual Mode (Hood On/Off Operation) The VCCX2 Controller can be configured as a CAV controller but switch to MUA operation when an exhaust hood is energized. This MUA Force Mode occurs when a 24 VAC wet contact closure is received on the Hood On binary input on the VCCX2 Controller. Under normal operation (CAV), the unit will operate as a recirculating Space Temperature (and Space Humidity) controlled unit. This sequence should not be used on a VAV unit. When the Hood On contact is made, the unit will open the Outdoor Air Damper to its full open position. The Heating and Cooling Modes will then be determined by the Outdoor Air Temperature Sensor using the Hood On Outdoor Air Heating and Cooling Setpoints which are used only in Hood On operation. Dehumidification would then be initiated by an Outdoor Dewpoint Setpoint. If using Reverse Building Pressure Control using the Outdoor Air Damper, the Hood On Input will not affect the damper position. When the Hood On Force Mode is removed, the unit will revert to CAV operation with the Outdoor Damper returning to its minimum position (unless economizer operation is enabled) and with mode control initiated by the Space Temperature and Humidity Sensors. Space Temperature Control of High Percentage Outdoor Air Units This option allows for Space Temperature control of 100% outdoor air units or units with a high percentage of outdoor air (normally 50% or greater). For this application you would configure “Space Temperature w/High Percentage OA” for the Controlling Sensor option. The intent of this sequence is to allow Space Temperature and Humidity control of the unit while preventing the dumping of hot or cold outside air into the space during the Space Vent Mode of operation. If a Return Air Humidity Sensor is available, it can be configured to initiate Dehumidification. As long as there is a Space Temperature call for Cooling or Heating or if there is a Space Dehumidification call, the unit will remain under Space Control. During this Space Control operation, if the configured minimum Outdoor Air Damper (Economizer) position is less than 100%, the Economizer can open farther for free cooling during Space Cooling Mode. Additionally, the Economizer minimum position can be overridden by IAQ CO2 conditions. If both the Space Temperature and the Space Humidity are satisfied, before switching to the Space Vent Mode, the controller compares the Outdoor Air Temperature to the Hood On HVAC Setpoints (Hood On MUA Setpoints) to determine if a continued demand for heating or cooling is required to prevent dumping. If there is no demand, the VCCX2 Controller switches to Vent Mode. If the Outdoor Air Temperature is greater than the Hood On HVAC Cooling Setpoint or less than the Hood On HVAC Heating Setpoint, plus the Occupied Deadband, the VCCX2 Controller will continue mechanical cooling or heating operation and stage or modulate it as necessary to maintain the Vent Mode Supply Air Setpoint (Calculated to be halfway between the Space Heating and Cooling Mode Enable Setpoints). During this outdoor control, if the configured minimum Outdoor Air Damper (Economizer) position is less than 100%, the minimum position can be overridden by IAQ CO2 conditions. While the unit is under Outdoor Air Temperature control, Dehumidification Mode is then initiated based on an Outdoor Air Dewpoint Setpoint with reheat controlling to the Vent Mode Supply Air Setpoint. Any call for space Cooling, Heating, or Dehumidification will cancel the outdoor operation and return the unit to Space Control. NOTE: All Minimum Run times must be satisfied before mechanical cooling or heating is de-energized. SEQUENCE OF OPERATIONS MUA, CAV/MUA, and Space Temperature Control

VAV Operation with Supply Air Tempering (VAV Operation with Outdoor Air Temperature Control) On a VAV unit that may need daytime heating in order to maintain the Cooling Supply Air Setpoint, previous controllers used a Supply Air Tempering sequence with the Supply Air Temperature Sensor configured as the controlling sensor. The VCCX2 Controller accomplishes the same result using the Hood- On Outdoor Air (OA) Setpoints to initiate Cooling and Heating. To utilize this sequence, the HVAC Mode Enable Source must be configured as Supply Air Tempering. Then, configure the Hood On HVAC Setpoints for the OA temperature values that will enable Cooling and Heating. The Hood On Heating Setpoint should be set at or above the OA Temperature, that when mixed with the Return Air (with the Economizer at its minimum position), will require Heating in order to achieve the Heating Supply Air Setpoint. The Hood On Cooling Setpoint would be set above that, which will allow a Vent Mode in between. Then, configure the Cooling and Heating Supply Air Setpoints. While not set at the same value, those would normally both be set at or near 55°F to allow the box heat to keep spaces comfortable. With this configuration, as the OA Temperature rises above the Hood On Cooling Setpoint, the unit will be in Cooling Mode, controlling to the Cooling Supply Air Setpoint. The Economizer can operate as normal for free cooling to maintain the Cooling Supply Air Setpoint. During the Vent Mode, when the OA Temperature is between the Hood On Cooling and Heating Setpoints, the economizer can modulate if necessary to maintain the Cooling Supply Air Setpoint. Whenever the OA Temperature falls below the Hood On Heating Setpoint, the unit will be in Heating Mode controlling to the Heating Supply Air Setpoint. The Economizer can still modulate during Heating Mode if the Supply Air Temperature is too warm, and it will control to a setpoint calculated to be 2°F above the Heating Supply Air Setpoint. In this way, the Economizer will have time to close to its minimum position before the Supply Air Temperature falls below the Heating Supply Air Setpoint and Heating is initiated. During Morning Warm-Up, heating will be controlled to the Morning Warm-Up Supply Air Setpoint. In this operation, if Night Setback operation will be initiated by a space sensor connected to the VCCX2 Controller, then the Night Setback Cooling and Heating Offsets will be applied to the normal Occupied HVAC Mode Enable Setpoints (not the Hood On Setpoints). During Night Setback operation, Heating will be controlled to the Morning Warm-Up Supply Air Setpoint. Finally, configure the VCCX2 for Duct Static Pressure Control (see the Duct Static Pressure Control section for complete details). Air to Air Heat Pump Operation Cooling Mode will operate in the same manner as described in the Cooling section. A reversing valve relay output can be configured to activate with the first compressor stage in the Heating Mode or the Cooling Mode of operation. In the Heating Mode, Compressor Heat, Auxiliary Heat, and Emergency Heat can be used to achieve the Active Supply Air Heating Setpoint. Auxiliary Heat can be either a modulating or staged form of heat, or it can be a modulating form of heat followed by staged heat. When Auxiliary Heat comes on in conjunction with a digital compressor heat stage, the digital compressor will be locked at 100% until the Supply Air Temperature (SAT) rises above the SAT Heating Setpoint plus the Heat Staging Window. At that point, the Auxiliary Heat will stage off (after a stage-down delay) and the digital compressor heat will be allowed to modulate. When the Outdoor Air Temperature (OAT) is below the Heating Lockout but above the OAT Compressor Heating Lockout, Compressor Heat will be used and can be supplemented by Auxiliary Heat. When the OAT is below the OAT Compressor Heating Lockout, Compressor Heat is locked out. Auxiliary Heat will then be the primary heat and can be supplemented with stage(s) of Emergency Heat (if available). Emergency heat is only available when the OAT is below the OAT Compressor Lockout. Heat Pump Standard Defrost Operation If using the VCCX2 Controller with an installed Defrost Coil Temperature Switch, a Defrost Cycle is available. If the compressor(s) are operating in the Heating Mode and the Defrost Coil Temperature Switch closes, the unit will enter the Defrost Mode, provided the user-adjustable Defrost Interval Timer has elapsed since the last Defrost Cycle. SEQUENCE OF OPERATIONS VAV w/SA Tempering, Air to Air Heat Pump and Standard Defrost

In the Defrost Cycle, the Reversing Valve Signal is switched to the opposite operation, and the compressors are brought to maximum capacity. Auxiliary Heat will be used to attempt to maintain the Heating SAT Setpoint. Emergency Heat cannot be used because it is locked out because the compressors are on. The unit will leave the Defrost Mode after 10 minutes have elapsed or the Defrost Coil Temperature Switch opens. If the unit leaves the Compressor Heating Mode, the Defrost Interval will restart once the unit re-enters the Compressor Heating Mode. Heat Pump Adaptive Defrost Operation The Adaptive Defrost operation adjusts the time interval (Adaptive Defrost Timer) in between Defrost Mode cycles. As stated above, the unit will leave the Defrost Mode after 10 minutes have elapsed or the Defrost Coil Temperature Switch opens. If the Defrost Cycle is terminated because the 10 minute timer runs out, this could be an indicator that the unit may need more defrost time. To address this issue, the Adaptive Defrost Timer value will be subtracted from the original Defrost Interval. If the Defrost Cycle is terminated between the 8th and 9th minute, the Defrost Interval will not be changed. If the Defrost Cycle is terminated before the 8th minute, this could be an indicator that the unit may need less defrost time. To address this issue, the Adaptive Defrost Timer value will be inversely proportionally added to the original Defrost Interval as the termination time moves from 8 minutes to 0 minutes. Adaptive Defrost can be disabled by setting the Adaptive Defrost Timer Setpoint to 0. Water Source Heat Pump Operation A reversing valve relay output can be configured to activate with the first compressor stage in the Heating Mode or the Cooling Mode of operation. In Heating Mode, Auxiliary Heat can be used with Compressor Heat to achieve the Active Supply Air Heating Setpoint. Auxiliary Heat can be: • Modulating Heat • Staged forms of Heat, • A modulating form of heat followed by staged heat. When Auxiliary Heat comes on in conjunction with a digital compressor heat stage, the digital compressor will be locked at 100% until the Supply Air Temperature (SAT) rises above the SAT Heating Setpoint plus the Heat Staging Window. At that point, the Auxiliary Heat will stage off (after a stage- down delay) and the Digital Compressor Heat will be allowed to modulate. There is no Defrost Mode on a Water Source Heat Pump Unit. The unit can be configured for a percentage of glycol. The options are 0%-40% in 5% increments. Electronic Expansion Valve (EXV) Operation If using EXVs with Bitzer VFD Compressors and the RSMV Module, then a Coil (Suction Line) Temperature Sensor will measure the Coil (Suction Line) Temperature after each Evaporator Coil line for each compressor, and this sensor will be connected to an RSMV Module. This temperature will be used in conjunction with the calculated saturated refrigerant temperature to calculate the Superheat of each evaporator coil. The EXV for each coil will then be controlled to maintain the Superheat Setpoint. Head Pressure Control The Refrigerant System Module (RSM) can monitor a Head Pressure Transducer and control a Condenser Fan to maintain a Head Pressure Setpoint. In Cooling Mode, the Condenser Signal will modulate to maintain the Cooling Head Pressure Setpoint. In Dehumidification Mode, the Condenser Output Signal controls to the Reheat Head Pressure Setpoint. High Head Pressure conditions produce the same effects as in the Cooling Mode. See the appropriate RSM Technical Guide for a more detailed sequence of operation. SEQUENCE OF OPERATIONS Heat Pump Adaptive Defrost, WSHP, EXV and Head Pressure

Evaporative Condenser Operation If the unit has been configured for Evaporative Condenser Control and the Outdoor Air Temperature is above the Evaporative/ Modulating Condenser Low Ambient Setpoint, the Evaporative Condenser Pump relay will energize to be used as the first stage of head pressure control when the compressors are active. Modulating condenser fan control will be the second stage. If the Outdoor Air Temperature is below the Evaporative/ Modulating Condenser Low Ambient Setpoint, the modulating condenser fan will be used as the first stage of head pressure control, and the Evaporative Condenser Pump relay will energize as the second stage. If the head pressure is above the Cooling Head Pressure Setpoint by the Evaporative Head Pressure Deadband Setpoint, the second stage of head pressure control will be enabled. At this level below the Cooling Head Pressure Setpoint, the second stage of head pressure control will be disabled. Sump Heater Operation The Sump Heater relay activates if the sump temperature is below the Sump Heater Enable Temperature Setpoint. The Sump Heater relay deactivates once the Sump Temperature rises 10ºF above the Sump Heater Enable Temperature Setpoint or if the Sump Drain relay is active. Sump Drain Enable Operation If the Sump Temperature is below the Sump Drain Enable Setpoint for one minute, the Sump Pump Drain relay will enable. The Sump Drain Enable relay can be disabled in one of two ways: 1. Cycle power to the VCCX2 when the Sump Temp is above the Sump Drain Enable Setpoint or 2. Use BACnet® point AV: 94 Sump Drain Override. The BMS needs to set AV: 94’s value to 1 and back to 0 when the Sump Temp is above the Sump Drain Enable Setpoint. Waterside Economizer (WSE) Operation If the unit is equipped with a Waterside Economizer (WSE), the following describes the operation of the WSE Valve, the WSE Bypass Valve, and the Condenser Valve operation during the different modes. Unit Off Mode and Unit Vent Mode The WSE, Bypass, and Condenser Valves will be closed. Unit Cooling Mode If in Cooling Mode, the Entering Water Temperature is below the Entering Air Temperature (measured by the sensor connected to the Outdoor Temperature Sensor input), by the Entering Water Control Deadband amount, the WSE Valve will modulate to maintain the Cooling Supply Air Setpoint. The Bypass and Condenser Valves will remain closed. If the WSE Valve opens to 100% and cannot maintain the Cooling Supply Air Setpoint, then the unit will enable and stage/modulate compressors to maintain the Cooling Supply Air Setpoint, while the WSE Valve is locked at 100%. The Bypass Valve will remain closed, while the Condenser Valve will modulate to maintain the Head Pressure Setpoint. If the Outdoor Air Temperature is cooler than the Entering Water Temperature, the WSE Valve will remain closed, and compressor cooling will stage/modulate to maintain the Cooling Supply Air Setpoint. The Bypass Valve will modulate to maintain the Head Pressure Setpoint, and the Condenser Valve will be open. Unit Heating Mode The WSE Valve is closed, while the Bypass Valve and Condenser Valves are open. NOTE: For WSE Bypass Wiring, please see the Refrigerant System Module for Digital Compressors (RSMD) Technical Guide. Waterside Economizer Flush Cycle If the Economizer has been closed for 72 hours, a Flush Cycle will be initiated the next time the compressor is activated or at the next 6:00 AM time slot, whichever happens first. During the Flush Cycle, the Economizer Valve will open for five minutes and then close again. The 72-hour timer will restart once the Flush Cycle is completed or the Economizer has been activated and has closed again. Temperature Protection Temperature Protection is activated when the Supply Air Temperature (SAT) rises above the High Cutoff Temperature (immediate) or drops below the Low Cutoff Temperature (for 10 minutes). Both cutoff setpoints are user-adjustable. This mode shuts off the unit. This mode is canceled when the SAT drops 5ºF below the High Cutoff Temperature Setpoint or rises 5ºF above the Low Temp Cutoff Temperature Setpoint or when the unit changes back into Occupied Mode. SEQUENCE OF OPERATIONS Evaporative Condenser, WSE, OA Lockouts and Temp Protection

Outdoor Air Lockouts The compressors are disabled during Cooling Mode when the Outdoor Air Temperature is below the Compressor Cooling Lockout Setpoint. Mechanical heating is disabled when the Outdoor Air Temperature is above the Heating Lockout Setpoint. For Air to Air Heat Pumps, the compressors are disabled during Heating Mode when the Outdoor Air Temperature is below the Compressor Heating Lockout Setpoint. System Broadcasts You can configure the VCCX2 Controller to broadcast Building Pressure, Outdoor Air Temperature, Outdoor Air Humidity, Space Temperature, Space Humidity, and CO2 to any VCCX2 Controller that does not have one or more of these sensor(s). A CommLink 5 or MiniLink PD 5 is required to broadcast these values. SEQUENCE OF OPERATIONS Evaporative Condenser, WSE, OA Lockouts and Temp Protection

Alarm Detection and Reporting The VCCX2 Controller continuously performs self diagnostics during normal operation to determine if any operating failures have occurred. These failures (alarms) can be reported to a Touch Screen System Manager, a Hand Held Modular Service Tool, or to a computer running Prism 2 software. The following are the available alarm designations for the VCCX2 Controller: Bad SAT Sensor Bad RAT Sensor Bad OAT Sensor Bad Space Sensor Bad CO2 Sensor Missing Outdoor CFM Sensor Missing Exhaust CFM Sensor Missing Supply CFM Sensor Missing Return CFM Sensor Mechanical Cooling Failure Mechanical Heating Failure Fan Proving Alarm Dirty Filter Alarm Emergency Shutdown Relay Runtime No Economizer Feedback Title 24 Economizer Air Temperature Sensor Failure Title 24 Economizer Damper Failure Title 24 Economizer Excess Outdoor Air Title 24 Economizer Not Economizing When It Should Title 24 Economizer Economizing, But Shouldn’t High Supply Air Temperature Cutoff Low Supply Air Temperature Cutoff High Control Temperature Low Control Temperature Preheat Low Temperature Missing RSM #1 Missing RSM #2 Missing RSM #3 Missing RSM #4 Missing PREHEAT-X Missing MHGRV-X Missing MODGAS-X Missing EM1 Missing 12RLY RSM 1 Operating Alarm RSM 2 Operating Alarm RSM 3 Operating Alarm RSM 4 Operating Alarm Sensor Failure Alarms Supply Air Temperature Sensor Failure Alarm The Supply Air Temperature Sensor Failure Alarm is generated when the controller detects an open or short circuit on the Supply Air Temperature Sensor input. Once the alarm is generated, the unit will be completely shut down. If a sensor is properly detected after the unit has alarmed, the alarm will be cleared and the unit will restart operations. Space Temperature Sensor Failure Alarm If the Space Sensor is configured as the controlling sensor (Mode Enable Sensor) or as the Reset Sensor, and if the controller detects an open or short circuit on the Space Sensor Input, or if the controller detects a missing E-BUS digital space sensor, then a Space Temperature Sensor Failure Alarm is generated. If the Space Sensor is configured as the controlling sensor and the Failure Alarm is generated, the unit will shut down. If the Space Sensor is only configured as a Reset Sensor and the Failure Alarm is generated, the Space Temperature will default to a value half way between the Heating and Cooling Mode Enable Setpoints, and the unit will continue to run. Outdoor Air Temperature Sensor Failure Alarm The Outdoor Air Temperature Sensor Failure Alarm is generated when the controller detects an open or short circuit on the Outdoor Air Temperature Sensor input. When this occurs, the outdoor air reading will be artificially set to the half point between the Cooling and Heating Lockout Setpoints. This will allow cooling and heating to continue operating. If the Outdoor Air Temperature Sensor is the controlling sensor (Mode Enable Sensor), this alarm will also shut down the unit. Return Air Sensor Failure Alarm This alarm is generated if the controller is configured to have a Return Air Sensor, but does not detect it. CO2 Sensor Failure Alarm This alarm is generated if the controller is configured to have a CO2 sensor, but does not detect it. IAQ Mode is disabled when this occurs. If a sensor is properly detected after the unit has alarmed, the alarm will be cleared and the unit will return to CO2 control. Airflow Alarms Outdoor Airflow Sensor Alarm Supply Airflow Sensor Alarm Return Airflow Sensor Alarm Exhaust Airflow Sensor Alarm SEQUENCE OF OPERATIONS Alarm Detection and Sensor Failure Alarms

If the controller is configured to have any of the above airflow sensors, but the controller does not detect that the sensor is connected, then the applicable alarm will occur. If the sensor is properly detected after the unit has alarmed, the alarm will be cleared. Missing Expansion Module Alarm Preheat-X Board Missing EM1 Expansion Missing RSM Modules #1 - #4 Missing Reheat Board Missing ModGas Board Missing 12 Relay Board Missing If the controller is configured to have any of the above Expansion Boards (Modules), but the controller does not detect that board, then the applicable alarm will occur. If the board is properly detected after the unit has alarmed, the alarm will be cleared. SEQUENCE OF OPERATIONS Alarm Detection and Sensor Failure Alarms

Mechanical Failure Alarms Mechanical Cooling Failure Fixed Stage Cooling: The Mechanical Cooling Failure Alarm is generated if the Supply Air Temperature fails to drop 5ºF (within a user-adjustable time period) from the temperature the supply air was at when the cooling was activated and the Supply Air Temperature is not within 5ºF of the setpoint. The alarm will be cleared when the Supply Air Temperature drops the 5ºF and sets the failure timer back to zero. Variable Capacity Compressors (Utilizing RSMs): This alarm is not generated; instead, the user has to monitor the Compressor Module Alarms for Mechanical Cooling issues. This alarm is also not generated if using a modulating chilled water valve. Mechanical Heating Failure For units with Fixed Stage Heating, the Mechanical Heating Failure Alarm is generated if the Supply Air Temperature fails to rise 5ºF (within a user-adjustable time period) from the temperature the supply air was at when the heating was activated and the Supply Air Temperature is not within 5 degrees of Setpoint. The alarm will be cleared when the Supply Air Temperature rises the 5ºF and sets the failure timer back to zero. If using the PREHEAT-X, any alarm on the PREHEAT-X will generate this alarm, also. This alarm is not generated if using a modulating hot water valve. Supply Fan Proof of Flow Interlock Alarm A Proof of Flow Switch provides a 24 VAC wet contact closure when the Supply Fan is operating. If this contact opens while the fan is being called to run, all heating and cooling is disabled, the Outdoor Air Damper closes (if it is not configured for Outdoor Temperature Control or Space Control with high percentage outdoor air), and a Fan Proving Alarm is generated. Fan Proving needs to be configured for this alarm to occur. There is a 30 second delay for this alarm. Return/Exhaust Fan Proving Alarm There are configuration options for Return Fan Proving and Exhaust Fan Proving Alarms. If the unit is configured for Return Fan Proving, it is assumed that the Return Fan is wired in parallel with the Supply Fan Relay. In this case, if the Supply Fan Relay is energized, but the Return/Exhaust Fan Proving Binary Input on the VCC-X EM1 Module does not see 24 VAC, a Return/ Exhaust Fan Proving Alarm will occur. If the unit is configured for Building Pressure Control of the Exhaust Fan, if the Exhaust relay is energized, but the Return/Exhaust Fan Proving binary input on the VCC-X EM1 Module does not see 24 VAC, a Return/ Exhaust Fan Proving Alarm will occur. Dirty Filter Alarm A differential pressure switch is used to provide a 24 VAC wet contact closure to indicate a Dirty Filter status. A Dirty Filter Alarm is then generated. Dirty Filter needs to be configured for this alarm to occur. Emergency Shutdown Alarm A 24 VAC wet contact input is available to be used when a Normally Closed Smoke Detector, Firestat, or other shutdown condition occurs. If this contact opens, it will initiate shutdown of the VCCX2 and will generate an alarm condition. If an Occupied relay is configured, it will remain energized. BACnet® override commands are canceled if the Emergency Shutdown Alarm is activated. Failure Mode Alarms High and Low Supply Air Temperature Alarms If the Supply Air Temperature rises above the user-adjustable High Supply Air Temperature Cutoff Setpoint, heating will be immediately deactivated, and a High Supply Air Temperature Cutoff Alarm will be generated. The fan will continue to run. This mode and alarm will be canceled if the Supply Air Temperature falls below the High Supply Air Temperature Cutoff Setpoint by 5ºF. If the Supply Air Temperature falls below the user-adjustable Low Supply Air Temperature Cutoff Setpoint, all Mechanical Cooling will be immediately deactivated. If, after 10 minutes, the Supply Air Temperature is still below this setpoint, the fan will be deactivated, the Outdoor Air Damper will close, and a Low Supply Air Temperature Cutoff Alarm will be generated. This mode and alarm will be canceled if the Supply Air Temperature rises above the Low Supply Air Temperature Cutoff Setpoint by 5ºF. High and Low Space Temp Failure When the Space Temperature rises above the Cooling Mode Enable Setpoint plus the Control Mode High Alarm Offset Setpoint for 30 seconds, the controller will generate a High Control Temp Failure Alarm. When the Space Temperature drops below the Heating Mode Enable Setpoint minus the Control Mode Low Alarm Offset Setpoint for 30 seconds, the controller will generate a Low Control Temp Failure Alarm. Both offset setpoints are user-adjustable. Preheat Low Temperature This alarm indicates a Leaving Air Temperature Cutoff Alarm condition which is activated if the Controlling Leaving Air Temperature has dropped below 35ºF for more than two minutes. The alarm will be disabled if after a fixed delay period the Leaving Air Temperature has risen above 35ºF. SEQUENCE OF OPERATIONS Mechanical Failure and Failure Mode Alarms

RSM Module (1-4) Operating Alarm This alarm indicates numerous alarm conditions. Please refer to the individual RSM Technical Guides for details. Title 24 (FDD) Economizer Alarms Economizer Temperature Sensor Failure Outside Air or Supply Air Temperature Sensor is shorted or missing. Economizer Not Economizing When it Should Economizer is enabled but not following the desired Economizer position commanded. Economizer Is Economizing When It Should Not Economizer is not enabled but the feedback signal indicates a position more open than the minimum. Economizer Damper Not Modulating Economizer is enabled but not within 10% of desired position within 150 seconds. Economizer Excess Outdoor Air Filter Economizer feedback is lost or Economizer is not following commanded position. SEQUENCE OF OPERATIONS Title 24 Economizer Alarms

VCCX2 CONTROLLER TREND LOGS Item Description Log Abbreviation (Unit) Date Date (Day Month) Time Time (24 Hr.) Mode of Operation Mode (Enumerated)* HVAC Mode HVAC (Enumerated)* Space Temperature Space (ºF) Indoor Humidity InRH (%) Mode Cooling Setpoint CSP (ºF) Mode Heating Setpoint HSP (ºF) Supply Air Temperature SAT (ºF) Supply Air Setpoint SATSP (ºF) Coil (Saturation) Temp Setpoint CoilSP (ºF) Return Air Temperature RAT (ºF) Return Air Humidity RA RH (%) Outdoor Air Temperature OAT (ºF) Outdoor Air Humidity OA RH (%) Outdoor Air Wetbulb OA WB (ºF) Outdoor Air Dewpoint OA DP (ºF) Carbon Dioxide CO2 (PPM) Outdoor Airflow CFM OACFM (kCFM) Supply Airflow CFM SACFM (kCFM) Return Airflow CFM RACFM (kCFM) Exhaust Airflow CFM EXCFM (kCFM) Building Pressure BldPr (WG”) Duct Static Pressure Static (WG”) MHGRV Valve Position ReHeat MODGAS Valve Position ModGas Main Fan Speed VFD Signal FanVFD (%) Economizer Position Econo (%) Modulating Heat Signal ModHeat (%) Building Pres. Relief VFD Signal Relief (%) Modulating Cooling Signal ModCool (%) Sensor Alarms AlrmGrp1 (Bit String)* Mechanical Alarms AlrmGrp2 (Bit String)* Temp Limit and Sump Drain Alarms AlrmGrp3 (Bit String)* Missing Module Alarms AlrmGrp4 (Bit String)* Refrigeration Module Alarms AlrmGrp5 (Bit String)* Binary Inputs Status Bin IN (Bit String)* Relays Status of VCCX2 and EM1 Main Rly (Bit String)* Relays Status of 12 Relay Expansion Module Exp Rly (Bit String)* * Bit String and Enumeration Value information and interpretation is explained in the paragraphs and tables at the end of this section. Table 5: VCCX2 Controller Trend Logs SEQUENCE OF OPERATIONS VCCX2 Controller Trend Logs

RSMZ MODULE TREND LOGS (TYPICAL OF 4 RSM MODULES) Item Description Log Abbreviation (Unit) System Status SYSState (Bit String)* System Command SYSCmd ((Bit String)* A1 Compressor Modulating Position 1Comp1Perc (%) A1 Condenser Fan Position 1CondFan (%) A1 Discharge Pressure 1DisPrs (PSI) A1 Discharge Line Temperature 1DisLnTmp (ºF) A1 Suction Pressure 1SucPr (PSI) A1 Suction Line Temperature 1SucLnTmp (ºF) A1 Saturation Temperature 1SatTmp (ºF) A1 Superheat 1Superheat (ºF) A1 Expansion Valve Position 1EEV1Pos (%) A1 Compressor Current 1CompCur (Amps) A1 Compressor Status 1Comp1Stat (Bit String)* A1 Compressor VFD Status 1VFDStat (Bit String)* A1 RSM Alarms 1RSMAlrms (Bit String)* A1 VFD Alarms 1 1VFDAlrm1 (Bit String)* A1 VFD Alarms 2 1VFDAlrm2 (Bit String)* A1 Subcooling Temperature 1Subcool 1Subcool (ºF) * Bit String and Enumerated Value information and interpretation is explained in the paragraphs and tables at the end of this section. Table 6: RSMZ Module Trend Logs SEQUENCE OF OPERATIONS RSMV/RSMD/RSMZ Trend Logs and Trend Log Enumerated Values RSM Trend Logs There can be as many as four RSMVs, four RSMDs, or six RSMZs on a unit, with each RSM controlling up to two compressors and condensers. These can be referred to as modules 1, 2, 3, and 4 or as modules A, B, C, and D. Various items in the trend logs can refer to different modules and different compressor/condensers on each module. For instance: • 1A1: Stat refers to the status of Module 1/Compressor 1 • 4D1 would be Module 4/Compressor 1. Likewise, 1SuctTmp1 refers to the suction (saturation) temperature of Module 1/Compressor 1, while 3SucTmp2 refers to the suction (saturation) temperature of Module 3/Compressor 2. Several trend log items will use this pattern to identify the status of values related to certain modules and the compressors or condensers on those modules. See Table 7, this page for RSMV / RSMD trend logs and Table 6, this page for RSMZ trend logs. RSMV / RSMD MODULE TREND LOGS (TYPICAL OF 4 RSM MODULES) Item Description Log Abbreviation (Unit) Compressor A1 Status 1A1Stat (Bit String)* Compressor A2 Status 1A2Stat (Bit String)* Compressor A1 Modulating Position 1Comp1 (%) Compressor A2 Modulating Position 1Comp2 (%) Condenser A1 Modulating Position 1Cond1 (%) Condenser A2 Modulating Position 1Cond2 (%) A1 Expansion Valve 1EXV1 (%) A2 Expansion Valve 1EXV2 (%) Condenser A1 Expansion Valve 1EXV3 (%) Condenser A2 Expansion Valve 1EXV4 (%) A1 Head Pressure 1HeadPr1 (PSI) A2 Head Pressure 1HeadPr2 (PSI) A1 Suction Pressure 1SuctPr1 (PSI) A2 Suction Pressure 1SuctPr2 (PSI) A1 Saturation Temperature 1SuctTmp1 (ºF) A2 Saturation Temperature 1SuctTmp2 (ºF) A1 Suction Line Temperature 1CoilTmp1 (ºF) A2 Suction Line Temperature 1CoilTmp2 (ºF) A1 Condenser Suction Temp 1CoilTmp3 (ºF) A2 Condenser Suction Temp 1CoilTmp4 (ºF) A1 Superheat 1SprHeat1 (ºF) A2 Superheat 1SprHeat2 (ºF) Condenser A1 Superheat 1SprHeat3 (ºF) Condenser A2 Superheat 1SprHeat4 (ºF) Superheat Setpoint 1SprHtSP (ºF) Saturation (Suction) Setpoint 1CoilSP (ºF) Leaving Water Temperature 1LvgWater (ºF) A1 Discharge Temperature 1DisChg1 (ºF) A2 Discharge Temperature 1DisChg2 (ºF) Relay 1 Status 1Relay1 (Bit String)* * Bit String and Enumerated Value information and interpretation is explained in the paragraphs and tables at the end of this section. Table 7: RSMV/RSMD Module Trend Logs

TREND LOG ENUMERATED VALUES Item Description Value Description Mode 0 Unoccupied 1 Occupied 2 Push Button Override Active HVAC 0 Off 1 Vent Mode 2 Cooling Mode 3 Heating Mode 4 Vent Dehumidify Mode 5 Cool Dehumidify Mode 6 Heat Dehumidify Mode 7 Warm-up Mode 8 Fan Purge Mode 9 Defrost Mode 10 Pushbutton Override Active RSMZ TREND LOG BIT STRINGS - COMPSTAT Item Bit Value Description 1Comp1Stat 2Comp1Stat 3Comp1Stat 3Comp2Stat 4Comp1Stat 5Comp1Stat 6Comp1STat 6Comp2Stat 0 1 Configured 1 2 Enabled 2 4 Running 3 8 Failed 4 16 Lockout 5 32 MinRunFlag 6 64 MinRunPending 7 128 MinOffFlag 8 256 MinOffPending 9 512 StageUpConditionsMet 10 1024 StageDwnConditionsMet 11 2048 StageUpFlag 12 4096 StageDwnFlag 13 8192 CoilTempSatisfied RSMZ TREND LOG BIT STRINGS - RSM ALARMS Item Bit Value Description 1RSMAlrms 2RSMAlrms 3RSMAlrms 4RSMAlrms 5RSMAlrms 6RSMAlrms 0 1 LowSuction 1 2 UnsafeSuction 2 4 TripHighDiscPSI_Comp1 3 8 Compressor1_NotRunning 4 16 Compressor2_NotRunning 5 32 LowSuperheat 6 64 HighDischargeTemperature 7 128 DMQ_NoDetect 8 256 ModBusSlaveCommTO 9 512 LowSuctionComp2Off 10 1024 TripHighDiscPSI_Comp2 11 2048 HighSuperheat 12 4096 HighEvapTemp SEQUENCE OF OPERATIONS RSMZ Trend Logs and Trend Log Enumerated Values Table 8: Trend Log Enumerated Values Table 9: RSMZ Module Comp Status Trend Log Table 10: RSMZ Module RSM Alarm Trend Log

RSMZ TREND LOG BIT STRINGS - VFD STATUS Item Bit Value VFD Status (Bit = 0) VFD Status (Bit = 1) 1VFDStat 2VFDStat 3VFDStat 4VFDStat 5VFDStat 6VFDStat 0 1 0 = Control Not Ready 1 = Control Ready 1 2 0 = Drive Not Ready 1= Drive Ready 2 4 0 = Coasting 1 = Enable 3 8 0 = No Error 1 = Trip 4 16 0 = No Error 1 = Error (no trip) 5 32 Reserved 6 64 0 = No Error 1 = TripLock (must cycle power) 7 128 0 = No Warning 1 = Warning 8 256 0 = Speed Not Equal Reference 1 = Speed Equal Reference 9 512 0 = Local Operation 1 = Bus Control 10 1024 0 = Out of Frequency Limit 1 = Frequency Limit Okay 11 2048 0 = No Operation 1 = In Operation 12 4096 0 = Drive Okay 1 = Stopped, Auto Start 13 8192 0 = Voltage Okay 1 = Voltage Exceeded 14 16384 0 = Torque Okay 1 = Torque Exceeded 15 32768 0 = Timer Okay 1 = Timer Exceeded Table 11: RSMZ Module VFD Status Trend Log RSMZ TREND LOG BIT STRINGS VFD ALARMS 1 Item Bit Value VFD Status (Bit = 0) 1VFDAlrm1 2VFDAlrm1 4VFDAlrm1 5VFDAlrm1 0 1 Brake Check 1 2 Pwr. Card Temp 2 4 Earth Fault 3 8 Ctrl. Card Temp 4 16 Ctrl. Word TO 5 32 Over Current 6 64 Torque Limit 7 128 Motor Th Over 8 256 Motor ETR Over 9 512 Inverter Overld. 10 1024 DC under Volt 11 2048 DC over Volt 12 4096 Short Circuit 13 8192 Inrush Fault 14 16384 Mains ph. Loss 15 32768 AMA Not OK Table 12: RSMZ Module VFD Alarm 1 Trend Log RSMZ TREND LOG BIT STRINGS VFD ALARMS 2 Item Bit Value VFD Status (Bit = 0) 1VFDAlrm2 2VFDAlrm2 4VFDAlrm2 5VFDAlrm2 0 1 Live Zero Error 1 2 Internal Fault 2 4 Brake Overload 3 8 U phase Loss 4 16 V phase Loss 5 32 W phaseLoss 6 64 Fieldbus Fault 7 128 24 V Supply Low 8 256 Mains Failure 9 512 1.8V Supply Low 10 1024 Brake Resistor 11 2048 Brake IGBT 12 4096 Option Change 13 8192 Drive Initialized 14 16384 Safe Stop 15 32768 Mech brake low Table 13: RSMZ Module VFD Alarm 2 Trend Log SEQUENCE OF OPERATIONS RSMZ Trend Logs and Trend Log Enumerated Values

Trend Log Bit String Decoding Bit String values allow the manipulation of binary data in useful ways. For instance, a single trend log item may need to represent multiple simultaneous true conditions. An example would be a trend log item indicating what binary inputs are currently active, what relays are currently active, or what alarms are currently active. A single bit string value can be decoded to determine which multiple conditions might be simultaneously true. This section is not intended to be a full explanation of how bit strings work, but just to explain how to decode the VCCX2 trend log items that are indicated as being bit string values. Example Binary Inputs Bit String Values 0 = No Binary Inputs Active 1 = Fan Proving 2 = Dirty Filter 4 = Hood On/Off 8 = Remote Occupied 16 = Remote Cooling 32 = Remote Heating 64 = Remote Dehumidification 128 = Emergency Shutdown If the trend log bit string value was 22 for Binary Inputs, you first identify the highest value shown above that can be subtracted from 22. That would be 16 (Remote Cooling). So, the Remote Cooling binary input is currently active. From the remainder of 6 (22 - 16 = 6) you then subtract out the next highest possible number. That would be 4 = Hood On/Off. So, the Hood On/Off binary input is also currently active. From the remainder of 2 (6 – 4 = 2) you subtract out the next highest possible number which is 2 = Dirty Filter. So, the Dirty Filter binary input is also currently active. There is no remainder (2 – 2 = 0), so there are no more inputs that are active. From the one value of 22 you are able to determine that three binary inputs were active when that trend item was recorded. With a value of 86, you would have started with 64 = Remote Dehumidification. This would have left a remainder of 22 (86 – 64 = 22) and you would then continue on to get the same three additional binary inputs in the previous paragraph. With any trend log value that is designated to be a bit string value you simply identify from the trend log section in this technical guide what the bit string values are for each status condition and perform the same calculation. The table that follows provides the Bits, values and descriptions for the various points on the VCCX2 Controller and associated modules. RSMZ VFD Status Decoding For the RSMZ VFD status, instead of just one set of bit string values, there are two. The trend log bit string value represents the values in the BIT=1 column. All other values not represented in the trend log bit string are then active in the BIT=0 column. Example If the trend log bit string was 5, then the following status would be true 0 = Timer Okay 0 = Torque Okay 0 = Voltage Okay 0 = Drive Okay 0 = No Operation 0 = Out of Frequency Limit 0 = Local Operation 0 = Speed Not Equal Reference 0 = No Warning 0 = No Error 0 = No Error 1 = Enable (Bit Value = 4) 0 = Drive Not Ready 1 = Control Ready (Bit Value = 1) SEQUENCE OF OPERATIONS Trend Log Bit String Decoding

VCCX2 TREND LOG BIT STRINGS Item Bit Value Description Alarm Group 1 0 1 Bad Supply Sensor 1 2 Bad Return Sensor 2 4 Bad Outdoor Air Sensor 3 8 Bad Space Sensor 4 16 Bad CO2 Sensor 5 32 Bad Building Pressure Sensor 6 64 Bad Outdoor Airflow Sensor 7 128 Bad Exhaust Airflow Sensor 8 256 Bad Supply Airflow Sensor 9 512 Bad Return Airflow Sensor 10 1024 Missing Space Humidity Sensor Reading Alarm Group 2 0 1 Mechanical Cooling Alarm 1 2 Mechanical Heating Alarm 2 4 Fan Proving Alarm 3 8 Dirty Filter Alarm 4 16 Emergency Shutdown Alarm 5 32 Relay Run Time Notification 6 64 Bad Economizer Feedback 7 128 Title 24 Failure Mode A 8 256 Title 24 Failure Mode B 9 512 Title 24 Failure Mode C 10 1024 Title 24 Failure Mode D 11 2048 Title 24 Failure Mode E Alarm Group 3 0 1 High Supply Air Temperature Cutoff 1 2 Low Supply Air Temperature Cutoff 2 4 High Control Temperature Alarm 3 8 Low Control Temperature Alarm 4 16 Preheater Alarm 5 32 Sump Drain Alarm Table 14: VCCX2 Trend Log Bit Strings VCCX2 TREND LOG BIT STRINGS Item Bit Value Description Alarm Group 4 0 1 Missing Refrigeration Module 1 1 2 Missing Refrigeration Module 2 2 4 Missing Refrigeration Module 3 3 8 Missing Refrigeration Module 4 4 16 Missing Preheater Module 5 32 Missing MHGR-(V or X) Module 6 64 Missing MODGAS Module 7 128 Missing EM1 Expansion Module 8 256 Missing 12 Relay Expansion Module Alarm Group 5 0 1 Refrigeration Module #1 Alarm 1 2 Refrigeration Module #2 Alarm 2 4 Refrigeration Module #3 Alarm 3 8 Refrigeration Module #4 Alarm Bin IN 0 1 Fan Proving 1 2 Dirty Filter 2 4 Hood On/Off 3 8 Remote Occupied 4 16 Remote Cooling 5 32 Remote Heating 6 64 Remote Dehum 7 128 Emergency Shutdown MainRly 0 1 Supply Fan Relay #1 1 2 VCCX2 Relay #2 Configurable 2 4 VCCX2 Relay #3 Configurable 3 8 VCCX2 Relay #4 Configurable 4 16 VCCX2 Relay #5 Configurable 5 32 VCCX2 Relay #6 Configurable 6 64 VCCX2 Relay #7 Configurable 7 128 VCCX2 Relay #8 Configurable 8 256 EM1 Relay #1 Configurable 9 512 EM1 Relay #2 Configurable 10 1024 EM1 Relay #3 Configurable 11 2048 EM1 Relay #4 Configurable 12 4096 EM1 Relay #5 Configurable Table 14: VCCX2 Trend Log Bit Strings (continued) SEQUENCE OF OPERATIONS Trend Log Bit String Decoding

VCCX2 TREND LOG BIT STRINGS Item Bit Value Description ExpRly 0 1 12 Relay Exp Relay #1 Configurable 1 2 12 Relay Exp Relay #2 Configurable 2 4 12 Relay Exp Relay #3 Configurable 3 8 12 Relay Exp Relay #4 Configurable 4 16 12 Relay Exp Relay #5 Configurable 5 32 12 Relay Exp Relay #6 Configurable 6 64 12 Relay Exp Relay #7 Configurable 7 128 12 Relay Exp Relay #8 Configurable 8 256 12 Relay Exp Relay #9 Configurable 9 512 12 Relay Exp Relay #10 Configurable 10 1024 12 Relay Exp Relay #11 Configurable 11 2048 12 Relay Exp Relay #12 Configurable 1A1Stat 1A2Stat 2A1Stat 2A2Stat 3A1Stat 3A2Stat 4A1Stat 4A2Stat 0 1 System On 1 2 Active Alarm 2 4 Disabled 3 8 Forced On 4 16 Forced Off 5 32 Outdoor Air Lockout 6 64 System Not Used 7 128 Min Run Pending 8 256 Min Off Pending 9 512 Defrost Mode Table 14: VCCX2 Trend Log Bit Strings (continued) SEQUENCE OF OPERATIONS Trend Log Bit String Decoding

VCCX2 Controller LEDs The VCCX2 Controller is equipped with LEDs that can be used to verify operation and perform troubleshooting. There are LEDs for communication, operation modes, and diagnostic codes. The VCCX2 Controller has 26 LEDs—10 used for operation and status, eight are used for relays, and eight are used for binary inputs. See Figure 46, page 101 for the LED locations. The LEDs associated with these inputs and outputs allow you to see what is active without using a voltmeter. The LEDs and their uses are as follows: Operation LEDs - Factory Troubleshooting POWER - This green LED will light up to indicate that 24 VAC power has been applied to the controller. APP HB - This green LED will light up and blink continuously to indicate the application software is working properly. OS HB - This green LED will light up and blink continuously to indicate the operating system is working properly. WDOG - This green LED will light up and stay lit to indicate the operating system is working properly. Diagnostic LEDs ALARM - This red LED is a diagnostic blink code LED. It will light up and stay lit when there is an alarm present. The type of alarm will display on the LCD display. STATUS 1 - This red LED is a diagnostic blink code LED. Under normal operation, it should not be blinking. If the LED is blinking non-stop along with Status 2 LED, the controller is resetting factory defaults. STATUS 2 - This red LED is a diagnostic blink code LED. If the software is running, this LED should blink at a rate of one blink every 10 seconds. If there is an override, the LED will blink two times every 10 seconds. And finally, if one of the outputs is in Force Mode, the LED will blink three times every 10 seconds. Communication LEDs EBUS - This yellow LED will blink to signal E-BUS communications. LOOP COMM - This yellow LED will light up and blink continuously to indicate the VCCX2 Controller is communicating. BACnet®- This yellow LED will light up and blink continuously to indicate BACnet® communications. Relay LEDs RLY1 - This green LED will light up when the Supply Fan is enabled and will stay lit as long as the Supply Fan is active. RLY2 - RLY8 - These green LEDs will light up when the relays are enabled and will stay lit as long as they are active. Binary Input LEDs BIN1 - This green LED will light up when the Proof of Flow Contact is closed. BIN2 - This green LED will light up when the Dirty Filter Switch is closed. BIN3 - This green LED will light up when the Hood On/Off Switch is closed. BIN4 - This green LED will light up when the Remote Occupied Switch is closed. BIN5 - This green LED will light up when the Remote Cooling Contact is closed. BIN6 - This green LED will light up when the Remote Heating Switch is closed. BIN7 - This green LED will light up when the Remote Dehumidification Switch is closed. BIN8 - This green LED will light up when the Emergency Shutdown Contact is closed. VCC-X EM1 Expansion Module LEDs The VCC-X EM1 Expansion Module is equipped with 4 LEDs that can be used as very powerful troubleshooting tools. See Figure 47, page 101 for LED locations. The LEDs and their uses are as follows: PWR - This LED will light up to indicate that 24 VAC power has been applied to the controller. ALARM - If the module does not receive communications for more than 1 minute, this LED will light up, the relays will turn off, and the Analog Outputs will go to 0 VDC. STAT - If the software is running, this LED should blink at a rate of 1 blink per second. COMM - Every time the module receives a valid E-BUS request from the VCCX2 Controller, this LED will blink on and then off, signifying that it received a valid request and responded. Binary Input LEDs BIN1 - This green LED will light up when the Return/Exhaust Proof of Flow contact is closed. RSM LEDs The RSM LEDs are described in the RSM Technical Guides. TROUBLESHOOTING VCCX2 Controller and EM1 LED Diagnostics