Specified Controls SC-Z20 Installation Manual

System Features • Fully modulating zone dampers and diffusers • Up to 20 zones • Auto changeover • Works with single stage, multi-stage, or heat pump systems • No programming required • Auxiliary heat control option for each zone • Night setback option • All low voltage wiring • LEDs indicates status of equipment and zones • Fused inputs and outputs System Benefits • Low Cost • Simple to wire • Easy to set up (No Laptop Required) • Reliable design

OVERVIEW The SC-Z20 is a commercial zone control system that allows a single HVAC unit to have up to 20 individual zones. Each zone is controlled by its own space thermostat and a modulating damper. When a majority of zones are calling for cooling, the system operates in the cooling mode. The SC- Z20 controls up to two stages of cooling to maintain a cooling discharge air setpoint. If a majority of zones are calling for heating, the system changes from the cooling mode to the heating mode. The SC-Z20 then controls up to two stages of heating to maintain a heating discharge air setpoint. When the number of heating and cooling requests are equal, the system satisfies the cooling request first. SEQUENCE OF OPERATION The SC-Z20 controls the system fan, two stages of cooling and two stages of heating. In the occupied mode, the fan runs continuously. Cooling stages are cycled to maintain a discharge air temperature of approximately 54° F. Heating stages are cycled to maintain a discharge air temperature of approximately 140° F. The control panel is equipped with two slide switches designated “ Minimum Calls” used to increase the number of zones that must be calling before the equipment will come on.All stages of heating and cooling have a five minute minimum ON/OFF time. There is also a ten minute time delay between first and second stage. The system will remain in whatever mode it is in for a minimum of fifteen minutes. If equal heating and cooling calls take place, cooling will receive priority. Equipment mode of operation is based on a “Majority Wins” control algorithm. UNOCCUPIED MODE The panel has a set of clock terminals “ ” for occupied and unoccupied scheduling. When the clock T terminals are open, the system is placed in the unoccupied mode.All stages of heating or cooling are turned off and the fan shuts off after a five minute delay. See wiring and programming instruction in this manual for the SC-Z20-NS Night Stat. WARNING 1.Turn power off to HVAC unit and control panel during installation to prevent serious injury from electrical shock and/or damage to the system. 2. Use extreme care when making duct openings and handling sheet metal to avoid injury. 3.The SC-Z20 panel and all components must be installed in a conditioned space where the ambient temperature will not exceed 150° F. 4. Install all components in a manner that provides access for test, check and startup. CAUTION 1. Installation of this system must be in compliance with all applicable codes. 2. HVAC system must be properly sized and balanced to assure optimum system performance. 3.Abypass damper must be installed to maintain proper system static pressure. 4.All low voltage wire must be 18 gauge. 5.All wiring should be color coded and tagged for proper identification. 6. When landing wires to the control panel, zone thermostats and actuator boards, make sure wires are snug, but do not over-tighten screw terminals.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 18 16 ZONE 13 ZONE 12 ZONE 11 ZONE 10 ZONE 9 ZONE 8 ZONE 7 ZONE 6 ZONE 5 ZONE 4 ZONE 3 ZONE 2 ZONE 1 R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W ZONE 20 ZONE 19 ZONE 18 ZONE 17 ZONE 16 ZONE 15 ZONE 14 24VAC R C NOT USED R C T T NS NS E E DAS DAS O/B G Y1 Y2 W1 W2 RH RC HVAC SYSTEM 1 AMP 1 AMP 1 AMP SPARE SYSTEM RH SYSTEM RC RH-RC JUMPER O/B G Y1 Y2 W1 W2 COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT 4 AMP PC BOARD HP HC SYSTEM B O REV VALVE 3 ZONES OFF MINIMUM 2 ZONES OFF CALLS ON OFF ECONO SPEED UP MODE STATUS HEAT COOL DAS ACTIVE OCCUPIED HEAT AUTO COOL CLOCK POWER CLOCK CONTACTS NIGHT STAT 1. 24 VOLT SYSTEM POWER TERMINALS 2. ZONE TERMINALS 14-20 3. 24 VOLT POWER TERMINALS FOR OPTIONAL TIME CLOCK 4. TIME CLOCK CONTACT TERMINALS (REMOVE FACTORY JUMPER WHEN WIRING CLOCK CONTACTS. N.C. = OCCUPIED MODE) 5. NIGHT THERMOSTAT TERMINALS 6. ECONOMIZER TERMINALS (CONTACTS CLOSED IN OCCUPIED MODE) 7. DISCHARGE AIR SENSOR TERMINALS 8. HVAC SYSTEM TERMINALS 9. RH-RC JUMPER 10. 1 AMP HVAC CONTROL SYSTEM FUSES 11. 1 AMP SPARE FUSE 12. SYSTEM SET-UP SLIDE SWITCHES 13. TIME DELAY SPEED UP BUTTON 14. HEAT/AUTO/COOL SELECTOR SWITCH 15. MICROPROCESSOR STATUS LED 16. HEAT/COOL MODE STATUS LEDs 17. ZONE TERMINALS 1-13 18. 4 AMP PC BOARD FUSE

FUNCTION NORMAL MODE SPEED UP MODE MINIMUM TIME IN HEAT OR COOL MODE 15 MINUTES 60 SECONDS (Once the system is in the heat or cool mode, it will remain there for a minimum of 15 minutes. The equipment may or may not be on during this period) MINIMUM OFF TIME REQUIRED BEFORE 5 MINUTES 20 SECONDS THE EQUIPMENT CAN SWITCH FROM HEAT OR COOL MODE TIME BETWEEN STAGES (UP-STAGING) 10 MINUTES 40 SECONDS EQUIPMENT MINIMUM ON/OFF TIME 5 MINUTES 20 SECONDS FAN RUN TIME AFTER CLOCK 5 MINUTES 20 SECONDS CONTACTS OPEN SC-Z20 SYSTEM STATUS LED DEFINITIONS AND FUNCTIONS Time Delay Speed - Up RED BLINKS when time delays are in speed up mode Discharge Air Sensor GREEN ON when DAS is connected BLINKS when 1st stage heat or cool go out on limit Status GREEN BLINKS to confirm microprocessor operation Zones (1-20) RED (Heat) ON when there is a call for heating GREEN (Cool) ON when there is a call for cooling HVAC System W1 GREEN ON when first stage heat is energized W2 GREEN ON when second stage heat is energized Y1 GREEN ON when first stage cooling is energized Y2 GREEN ON when second stage cooling is energized G GREEN ON when fan is energized O/B GREEN ON when reversing valve is energized Occupied GREEN ON when system is in occupied mode. Mode RED (Heat) ON when system is in the heat mode GREEN (Cool) ON when system is in the cooling mode SYSTEM SET UP SWITCH DESIGNATIONS HC Conventional Heat/Cool System HP Heat Pump System B Energizes the reversing valve on a call for heating O Energizes the reversing valve on a call for cooling 2 ZONES Two zones must call to energize the equipment 3 ZONES Three zones must call to energize the equipment (When both switches are OFF, the default is 1) ON OFF HP HC SYSTEM B O REV VALVE 3 ZONE OFF MINIMUM 2 ZONES OFF CALLS Speed Up Mode auto-resets after 15 minutes

PANEL LAYOUT ZONE 13 ZONE 12 ZONE 11 ZONE 10 ZONE 9 ZONE 8 ZONE 7 ZONE 6 ZONE 5 ZONE 4 ZONE 3 ZONE 2 ZONE 1 R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W ZONE 20 ZONE 19 ZONE 18 ZONE 17 ZONE 16 ZONE 15 R C NOT USED R C T T NS NS E E DAS DAS O/B G Y1 Y2 W1 W2 RH RC 1 AMP 1 AMP 1 AMP SPARE SYSTEM RH SYSTEM RC RH-RC JUMPER O/B G Y1 Y2 W1 W2 COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT 4 AMP PC BOARD HP HC SYSTEM B O REV VALVE 3 ZONES OFF MINIMUM 2 ZONES OFF CALLS ON OFF ECONO SPEED UP MODE TIME DELAYS DIVIDED BY 15 STATUS HEAT COOL DAS ACTIVE OCCUPIED HEAT AUTO COOL SC-Z20 ‘E’ AND ‘E’ CONTACTS CLOSE IN OCCUPIED MODE DISCHARGE AIR SENSOR HEAT SETPOINT 140° F COOL SETPOINT 54° F 24V 120V R W2 W1 Y2 Y1 G 0/B HVAC UNIT WIRE TO ZONE DAMPER ACTUATOR BOARD TERMINALS (R, C, Y, W) TYPICAL OF ALL ZONES 24 VOLT 75VA TRANSFORMER WIRE TO ZONE DAMPER ACTUATOR BOARD TERMINALS (R, C, Y, W) TYPICAL OF ALL ZONES Optional SC-Z20-S1 Remote Sensor Terminals PLACE JUMPER ACROSS ‘R’ AND ‘T’ TERMINALS SC-Z20-NS NIGHT STAT S2 SC S1 AUX AUX O/B Y1 Y2 W1 G R C Jackson Systems, LLC www.jacksonsystems.com WIRE ACCESS HOLE BATTERY COMPARTMENT MOUNTING HOLES MOUNTING HOLES W2 MOUNTING HOLE

ZONE THERMOSTAT WITH AUTO CHANGEOVER C 24 VAC (Common) R 24 VAC (Hot) PO Power Open PC Power Close DS Duct Sensor Y Cooling Relay W Heating Relay A / B Modbus Communications TERMINAL DESIGNATIONS KEY FUNCTIONS ON/OFF KEY - When the SC-Z20-T is not locked, this key allows the thermostat to be turned ON or OFF. When in the OFF position, the damper is also driven closed STATUS KEY - Pressing the STATUS key displays the UNIT number, ZONE number, DUCT temperature and DAMPER position. UP/DOWN KEYS - These keys are used to increase or decrease the setpoint as well as change thermostat setup values. ENTER KEY - This key is used to enter changes as well as exit the setup menu. (Refer to Installation/Operation Manual for complete setup instruction) OPERATION The duct sensor wired to the SC-Z20-T is designed to select the mode of operation of the damper. If the discharge air temperature is above 72° F, the damper will open on a call for heating. If the discharge air temperature is below 72° F, the damper will open on a call for cooling DISASSEMBLING THERMOSTAT Insert a small, flat-bladed screw driver in the release slot located on the bottom of the thermostat and pry straight up and away from the subbase. Avoid twisting the case as this may stress the LCD and cause it to crack or bend the wiring terminal connection pins. SWITCH FUNCTIONS There are eight dip switches located on the thermostat PC board. Only dip switches 1, 2 and 3 are active. SWITCH 1 - When Switch 1 is set to the ON position, the thermostat is locked as indicated by a padlock icon shown on the LCD. When locked, only setpoint changes and status functions can be accessed by the user. Do not set Switch 1 in the ON position until all SETUP functions are completed. SWITCH 2 - Switch 2 is used to display the space temperature and setpoint in Celsius (ON position) or Fahrenheit (OFF position). Select Celsius or Fahrenheit before proceeding to the thermostat SETUP menu. SWITCH 3 - Switch 3 is used to select two- position (ON) or fully modulating (OFF) damper control to best suit the specific application requirement. FACTORY DEFAULT SETTINGS Minimum Heating Damper Position 10% Minimum Cooling Damper Position 10% Maximum Damper Position 100% Unit Number 00 Zone Number 00 Heating Limit 76° F Cooling Limit 68° F Actuator Speed 90 Modbus Address 01 Temperature Calibration Offset 0

actuator board and signal the SC-Z20 panel that there is a heating call. When the room temperature is 1.5 degrees above the setpoint the thermostat will close the R to Y contacts on the actuator board and signal the SC-Z20 panel that there is a cooling call. DAMPER NOTES: To balance the HVAC system, unlock the thermostat by setting slide switch 1 to the OFF position. Press and hold the SETUP key until the word DAMPER appears on the LCD. Press the UP or DOWN key until the word OPEN appears on the LCD and then press the ENTER key. The damper will drive open. After balancing, the thermostat must be set for normal damper operation. Using the above steps, press the UP or DOWN key until only the word DAMPER appears on the LCD and then press the ENTER key. The actuator board is located on the side of the damper actuator and is wired at the factory. Each zone damper requires 2VA. The space thermostat will control up to 12 damper actuators wired in parallel. If the discharge air temperature at the damper is warmer than 72 degrees, the damper will open on a call for heating.. If the discharge air temperature at the damper is below 72 degrees, the zone damper will open on a call for cooling. SC-Z20 PANEL NOTES: Use standard 18 gauge thermostat wire. Run four wire cable from the panel terminals (R, C, Y, W) to each individual zone damper actuator board. Panel requires a separate 24VAC transformer with proper VA rating. Locate discharge air sensor 3 feet down stream in trunk line. Time Delay Speed Up Button shortens all the time delays on the control panel (use for testing only). Minimum Call Selector Switches determine the number of zones that must be calling in order for the system to bring on the heating or cooling equipment. Time clock contacts are closed during occupied cycle. SC-Z20-T MODULATING OR TWO-POSITION ZONE THERMOSTAT PO PC W R C DS DS Y 1 2 3 4 5 6 7 8 C R R Y W 1 2 3 4 5 ACTUATOR BOARD DAMPER OR DIFFUSER ACTUATOR 90 SECOND TIMING 90° STROKE 44 lb.-in. 2VA DAMPER OPEN (24VAC) DAMPER CLOSED (24VAC) CALL FOR HEAT (24VAC) 24VAC POWER (HOT) 24VAC POWER (COM.) DUCT SENSOR DUCT SENSOR CALL FOR COOL (24VAC) (10K OHMS @77°) OPEN CLOSED COM. DS DS HEAT COOL WIRE TO OPTIONAL SLAVE DAMPER (UP TO 12 MAY BE WIRED IN PARALLEL) SC-Z20-T AUTO CHANGEOVER SPACE THERMOSTAT R TO W CONTACTS CLOSE ON A CALL FOR HEAT. R TO Y CONTACTS CLOSE ON A CALL FOR COOL C R Y W WIRE TO SC-Z20 ZONE PANEL TERMINALS FACTORY JUMPER RED LED INDICATES A CALL FOR HEATING GREEN LED INDICATES A CALL FOR COOLING DUCT SENSOR COM OPEN CLOSE

Actuator requires a 24VAC 40VA transformer. Option 2: Sensor can be relocated after the electric duct heater. RY1 relay coil can be wired to terminals Option 1: RY1 can be used to bring on electric heat and drive damper open without relocating sensor. A 15K Ohm PO PC W R C DS DS Y 1 2 3 4 5 6 7 8 C R R Y W 1 2 3 4 5 ACTUATOR BOARD DAMPER OR DIFFUSER ACTUATOR 90 SECOND TIMING 90° STROKE 44 lb.-in. 2VA DAMPER OPEN (24VAC) DAMPER CLOSED (24VAC) CALL FOR HEAT (24VAC) 24VAC POWER (HOT) 24VAC POWER (COM.) DUCT SENSOR DUCT SENSOR CALL FOR COOL (24VAC) DUCT SENSOR (10K OHMS @77°) OPEN CLOSED COM. DS DS HEAT COOL WIRE TO OPTIONAL SLAVE DAMPER (UP TO 20 MAY BE WIRED IN PARALLEL) SC-Z20-T AUTO CHANGEOVER SPACE THERMOSTAT FACTORY JUMPER RED LED INDICATES A CALL FOR HEATING GREEN LED INDICATES A CALL FOR COOLING OPTION 1 resistor must be wired to the relay contacts so that when the relay is energized, the resistor will be in parallel with the duct sensor. This will change the ohms value translating to a higher duct temperature which will drive the damper open. NC C NO RY1 RELAY 24 V COIL 15K Ohm Resistor SC-Z20-T MODULATING OR TWO-POSITION ZONE THERMOSTAT WIRE TO SC-Z20 ZONE PANEL TERMINALS 3 and 5 on the actuator board. Relay contacts are wired in series with the duct heater coil. OPTION 2 NC C NO RY1 RELAY 24 V COIL WIRE TO DUCT HEATER COIL 5 3 WIRING DIAGRAM FOR ZONE HAVING AN ELECTRIC DUCT HEATER COM OPEN CLOSE

WIRING DIAGRAM ZONE 13 ZONE 12 ZONE 11 ZONE 10 ZONE 9 ZONE 8 ZONE 7 ZONE 6 ZONE 5 ZONE 4 ZONE 3 ZONE 2 ZONE 1 R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W R C Y W ZONE 20 ZONE 19 ZONE 18 ZONE 17 ZONE 16 ZONE 15 R C NOT USED E E DAS DAS O/B G Y1 Y2 W1 W2 RH RC 1 AMP 1 AMP 1 AMP SPARE SYSTEM RH SYSTEM RC RH-RC JUMPER O/B G Y1 Y2 W1 W2 COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT COOL HEAT 4 AMP PC BOARD HP HC SYSTEM B O REV VALVE 3 ZONES OFF MINIMUM 2 ZONES OFF CALLS ON OFF ECONO SPEED UP MODE TIME DELAYS DIVIDED BY 15 STATUS HEAT COOL DAS ACTIVE OCCUPIED HEAT AUTO COOL OVERVIEW: The SC-Z20-NS programmable touchscreen thermostat can be used for occupied and unoccupied scheduling of the SC-Z20. When wired and configured properly, the thermostat takes the place of a separate 7-day clock, night stat and override timer. The SC-Z20-NS Programmable Fan option is used to trigger the ‘G’ fan relay to open or close the Clock Contact ‘T’ terminals on the SC-Z20 panel that places the system in the occupied or unoccupied mode of operation. The thermostat can also be used with a SC-T32-S1 Indoor Remote Sensor. 24 volt power to the thermostat is supplied by the SC-Z20 panel through dedicated Clock Power terminals ‘R’ and ‘C’. The thermostat also has battery backup to maintain the real-time clock in the event of a power failure. The thermostat can be configured to provide 7-day scheduling with 2 or 4 events per day. For commercial schedules, 2 events per day is typical. WIRING: Wiring the SC-Z20-NS to the SC-Z20 panel only requires 18 gauge thermostat wire. (See diagram) Wire the thermostat ‘C’ terminal to the Clock Power ‘C’ terminal on the SC-Z20 panel. Wire the thermostat ‘R’ terminal to the Clock Power ‘R’ terminal on the SC- Z20 panel. Jumper the ‘R’ terminal on the panel to one of the Clock Contacts ‘T’ terminals. Wire the thermostat ‘G’ terminal to the other Clock Contacts ‘T’ terminal. If an optional SC-T32-S1 remote sensor is used, use separate 18-2 wire and wire the sensor to the ‘SC’ and ‘S1” terminals on the thermostat. (Polarity does not matter) Maximum wire distance between thermostat and sensor is 200 feet. Optional SC-T32-S1 Remote Sensor Terminals PLACE JUMPER ACROSS ‘R’ AND ‘T’ TERMINALS SC-Z20-NS NIGHT STAT S2 SC S1 AUX AUX O/B Y1 Y2 W1 G R C Jackson Systems, LLC www.jacksonsystems.com WIRE ACCESS HOLE BATTERY COMPARTMENT MOUNTING HOLES MOUNTING HOLES W2 MOUNTING HOLE

HOW IT WORKS: The SC-Z20-NS does not control the HVAC equipment and only uses the ‘G’ fan relay to put the SC-Z20 panel in either the occupied or unoccupied mode. This is accomplished by using the Programmable Fan option so that the fan relay is energized during occupied mode (Always On) and de-energized during unoccupied mode (Automatic). When in Automatic mode, the fan relay will only energize when the temperature rises above or falls below the programmed unoccupied heating and cooling setpoints. RECOMMENDED SETUP: Refer to the Installation Instructions to configure the thermostat. Leave all other setup menu items not shown below in factory default. SYSTEM SWITCH SETTINGS: The SC-Z20-NS contains a set of four system switches located on the thermostat printed circuit board. Make sure the system switches are set as follows: Sw 1 = OFF Sw 2 = ON Sw 3 = OFF Sw 4 = OFF INSTALLER SETUP MENU CHANGES: After the thermostat is powered up, touch and hold both the and section for 5 second to enter the Installer Menu. Clock Mode Touch to advance forward through the menu or touch to backup. Mode Fan MENU CHANGES: (LEAVE ALL OTHER OPTIONS AT FACTORY DEFAULTS) 02 = 2 (2 schedules per day) 04 = 1 (Programmable Fan) After the above changes have been made, touch and hold until the thermostat exits the Installer Setup menu. Mode SETTING THE CLOCK AND DAY OF WEEK: It is important that the time of day and day of the week is set properly so that occupied and unoccupied programs start on time. 1. Touch the until the day of the week flashes. Tap the or arrow to select the day of the week. Clock UP DOWN 2. Touch again and the hour will flash. Tap the or arrow to select the correct hour. Note: PM hours are indicated Clock UP DOWN by on the LCD. PM 3. Touch again and the minutes will flash. Tap the or arrow to select the correct minutes. Clock UP Down 4. To exit the menu, touch again. Clock DAYLIGHT SAVING TIME: Refer to the User Manual and DST Chart for Daylight Saving Time option. PROGRAMMING EVENTS: When the thermostat is configured to provide 2 schedules per day (Occupied/Unoccupied), 7 day per week, each event is displayed on the LCD as (Occupied) and (Unoccupied). DAY NIGHT 1. Touch until (Monday) flashes. Program Mon 2. Tap again until the hour flashes and is displayed on the LCD. Use the or arrow to set the hour start Program Day UP DOWN time. Note: PM hours are indicated by on the LCD. PM 3. Tap again until the minutes flash. Use the or arrow to set the minutes. Program UP DOWN 4. Tap again and the heating setpoint will flash. Leave the setpoint at the factory default of 70 degrees. Program 5. Tap again and the cooling setpoint will flash. Leave the setpoint at the factory default of 75 degrees. Program 6. Tap again and the fan option will flash. This is the correct setting for the Day mode. If not, use the or Program Always On UP DOWN arrow to set the fan option from Automatic to Always On.

is displayed on the LCD. Use the or arrow to set the hour start Program Night UP DOWN time. Note: PM hours are indicated by on the LCD. PM 8. Tap again until the minutes flash. Use the or arrow to set the minutes. Program UP DOWN 9. Tap again and the heating setpoint will flash. You can use the or arrow to change the heating setpoint or Program UP DOWN use the factory default of 62 degrees. 10. Tap again and the cooling setpoint will flash. You can use the or arrow to change the cooling setpoint or Program UP DOWN use the factory default of 83 degrees. 11. Tap again and the fan option will flash. This is the correct setting for the Night mode. If not, use the or Program Automatic UP arrow to set the fan option from Always On to Automatic. DOWN 12. Tap again and (Copy) will appear on the LCD. If you wish to copy the Monday program to additional days of the Program CPY week, use the or arrow to add additional days. Example: UP DOWN Mon Tue Wed Thu Fri 13. Once you have selected the days to be copied, touch . Program CPY will begin to flash and then the next programming day will flash. Example: If you copy the Monday schedule through Friday, Sat (Saturday) will flash. Simply repeat the programming steps for any day where the building will be unoccupied. The only required change is that both the and fan option Day Night should be set to and the heating and cooling setpoints for should reflect the unoccupied setpoints for . Automatic Day Night 14. Once programming is completed, make sure the thermostat is set in the mode of operation. Auto TYPICAL 7-DAY SCHEDULE HAVING 2 EVENTS PER DAY WITH SATURDAY/SUNDAY UNOCCUPIED PROGRAM DAY START TIME HEAT COOL FAN SETPOINT SETPOINT DAY MON 7:00 AM 70 75 Always On NIGHT 5:00 PM 62 83 Automatic COPY MONDAY PROGRAM TO TUESDAY, WEDNESDAY, THURSDAY AND FRIDAY DAY SAT 7:00 PM 62 83 Automatic NIGHT 5:00 PM 62 83 Automatic COPY SATURDAY PROGRAM TO SUNDAY

• Extra consideration should be given when applying any zone control system to a building that requires large amounts of cooling in the core zones during cold weather. Consider adding auxiliary heat to external zones or using one system for the core zones and one system for the external zones. • It is recommended that the system installation be limited to 50 tons of capacity. Rooftop units with economizers and relief dampers are strongly recommended for buildings with core cooling loads. • Over-sizing of the HVAC equipment is not recommended. In most cases, it is better to slightly undersize the equipment. • It is recommended that the HVAC equipment have two stages of heating and two stages of cooling. • The pressure drop through the zone dampers is negligible and should not be a factor when sizing branch duct runs. • Zone dampers are rated up to 2” w.c. of static pressure and up to 2,000 fpm. • Zone dampers should be installed as far back from discharge air grille as possible. Flex duct should be used for the last 5 feet of each branch run. • Bypass dampers should be sized for 90% of the total system air flow at 2,500 fpm. • The SC-Z20 panel should be located near the center of the building to keep wire runs as short as possible. • DO NOTmount the SC-Z20 panel on or inside the rooftop unit. • Use a separate 24 VAC, rated at the proper VAtransformer for the SC-Z20 panel. • All wiring should be 18 gauge standard or plenum rated thermostat wire. • Wiring should comply with all local and national codes.

location approximately 60 inches from the floor. Do not install the control panel on or inside a rooftop unit. 24 VOLT POWER The control panel requires a 24 Volt transformer with a proper VA rating. Do not power the control panel from the transformer in the HVAC equipment. Connect 24 Volts to the terminals labeled 24 VAC INPUT POWER on the interface board. 18-2 thermostat wire is recommended. DISCHARGEAIR TEMPERATURE SENSOR The control panel requires a discharge air temperature sensor. Mount the sensor 26 inches from the HVAC equipment in the supply duct. Connect the sensor to the terminals labeled DAS on the interface board. 18-2 thermostat wire is recommended. HVAC UNIT The control panel is wired to the HVAC equipment in the same way as a standard 2-stage heat / 2-stage cool thermostat. Connect the HVAC equipment to the terminals labeled HVAC SYSTEM on the interface board. 18-8 thermostat wire is recommended. R, C,Y,AND W ZONE DAMPER TERMINALS The control panel requires a heating and cooling contact closure from each zone damper. Connect terminals , , R C Y, and W R C, Y W from each zone damper to the terminals labeled , , and on the interface board. 18-4 thermostat wire is recommended. SC-Z20-NS PROGRAMMABLE NIGHT STAT (OPTIONAL) The control panel has an optional input for a SC-Z20-NS programmable night stat. To install the thermostat, remove the factory installed jumper between the two terminals labeled and and wire the jumper across terminals and . Refer to T T R T the SC-Z20-NS wiring and programming instructions in this manual. MINIMUM CALLS SELECTION SWITCHES The control panel is equipped with two Minimum Calls selector switches located on the interface board. When both switches are in the OFF position, any zone calling can bring on the equipment. When the 2 ZONES switch is in the ON position, at least two zones have to call to bring on the equipment. When the 3 ZONES switch is in the ON position, at least three zones have to call to bring on the equipment. If both and switches are in the ON position, the 2 ZONES 3 ZONES default is three. TIME DELAYSPEED UPBUTTON The control panel is equipped with a time delay speed up button. When the speed up button is engaged the time delays between stages and between modes of operation are divided by 15. The time delay speed up mode will reset after fifteen minutes.Time delay speed up should only be used for start up and service.

CONTROL PANEL SPECIFICATIONS APPLICATION: The model SC-Z20 is a commercial zone control system that allows a single heating and cooling unit to have up to 20 individual zones. Each zone is controlled by its own space thermostat and motorized damper. If a majority of zones are calling for heat, the system will operate in the heating mode. The two stages of heat will be cycled to maintain the heating discharge air setpoint. If a majority of zones are calling for cooling, the system will operate in the cooling mode and the two stages of cooling will be cycled to maintain the cooling discharge air setpoint. If the number of zones calling for heating and cooling are equal, the system will operate in the cooling mode first. This is known as Cooling Priority. Each zone damper or diffuser will modulate, based on zone and discharge air temperature, to maintain the individual zone temperature setpoint. Abarometric or electronic bypass damper will modulate to maintain the duct static pressure. DIMENSIONS: Height: 13.5” Width: 11.0” Depth: 2.0” PANELCONSTRUCTION: Rating: NEMA1 Material #18 aluminum with 4 knock-outs on top (open bottom) Door: Fully removable, self-centering Finish: Blue anodized POWER REQUIREMENTS: Voltage: 24 VAC VA: 2 VAper individual zone damper actuator Dampers / Diffusers - 2 VAEach OPERATINGAMBIENT: Temperature: 32°F to 120°F SHIPPING WEIGHT: Panel Weight: 10.0 lbs. WARRANTY: Panel: 5Years

A. General. Provide a SC-Z20 zone control system manufactured by Specified Controls to meet the performance as specified in this section. Each zone control system shall meet the following requirements. 1. The zone control system shall be composed of one logic panel, up to 20 zone dampers with actuators, zone thermostats, and bypass damper(s). 2. The zone control system shall be capable of controlling up to 20 zones and must use proprietary fully modulating thermostats. 3. The system shall have auto changeover and be capable of controlling two stages of heat and two stages of cooling. The system shall also be compatible with heat pump systems. 4. The zone control system shall not require any field programming. A laptop computer or service tool shall not be required for setup and troubleshooting. B. Environment. The zone control panel shall be suitable for the indoor ambient conditions and shall be rated for operation between 32°F and 120° F. C. Serviceability. Provide diagnostic LEDs for heating stages, cooling stages, fan, and the heating or cooling request of each zone. D. . The zone control system shall require a battery back-up. No battery back-up not E. Power and Immunity to noise. The zone control system shall be able to operate between 90% and 110% of nominal voltage rating and shall not be affected by radio frequency interference (RFI). 1.02 ZONE DAMPERS A. Zone dampers shall be round, rectangular or VAV diffuser type. Round dampers shall have a diameter of 6 inch to 36 inch. Rectangular dampers shall have a minimum size of 8 inch by 8 inch. VAV diffusers shall have an inlet size of 6 inch to 14 inch. 1. . 18 gauge (minimum) galvanized steel. Frames 2. . 18 gauge (minimum) galvanized steel. Blades 3. Bearings. Oil impregnated sintered iron bushings.

shell. Leakage shall be less than 2% at 3 inches of static pressure. 5. Dampers shall be Specified Controls ZD-XX, ZD-XXXX or approved equal. 6. VAV Diffusers shall be Specified Controls VD-XX or approved equal. 7. All zone dampers to have minimum position adjustments. 1.03 ELECTRIC DAMPER ACTUATORS AND ACTUATOR CONTROL BOARDS A. Modulating and two position damper actuators. All zone damper actuators shall have sufficient reserve power to provide smooth action as specified. 1. Damper actuators shall be capable of turning clockwise or counterclockwise and be powered by a reversible motor which is connected to the output shaft. 2. All actuators shall be factory wired to the damper control board. 3. All damper actuators shall be mounted outside of the air stream. B. The damper actuator control board shall provide wiring terminals for all field and factory wiring. The damper actuator board will also provide an output for auxiliary zone heat. 1. . Damper actuator and duct sensor. Factory Wiring 2. Field Wiring. Zone thermostat, wiring to system panel, and optional auxiliary heat. 1.04 BYPASS DAMPERS A. Bypass damper(s) shall be provided to maintain the proper duct static pressure. 1. The bypass damper(s) shall be round or rectangular. 2. Systems under 0.75” w.c. of static pressure shall use a barometric bypass damper. 3. Systems 0.75” w.c. and over of static pressure shall use an electronic bypass damper with static pressure controller. 4. The bypass damper(s) shall be sized for 90% of the total air flow at 2500 FPM.

2. All control wiring shall be standard or plenum-rated thermostat wire. 18 gauge minimum. No shielded cable shall be required. 3. Control wire and cable shall be installed in accordance with NEC. 1.06 SERVICE AND GUARANTEE A. General. The entire zone control system shall be warranted for a period of five (5) years from date of installation. This includes the components only and does not include labor of any kind. SC-06-1267-051717