Regin Regio Midi Manual 

warranties as regards the contents of this manual and users are requested to report errors, discrepancies or ambiguities to Regin, so that corrections may be made in future editions. The information in this document is subject to change without prior notification. The software described in this document is supplied under license by Regin and may be used or copied only in accordance with the terms of the license. No part of this document may be reproduced or transmitted in any form, in any fashion, electronically or mechanically, without the express, written permission of Regin. COPYRIGHT © AB Regin. All rights reserved. TRADEMARKS Some product names mentioned in this document are used for identification purposes only and may be the registered trademarks of their respective companies. February 2018 Document revision: 1.7 The functions described in this manual are handled using Regio tool© version 1.6

CHAPTER 1 ABOUT THE MANUAL ..................................................................................... 5 Terms ................................................................................................................................ 5 More information ............................................................................................................. 5 CHAPTER 2 INTRODUCTION TO REGIO .............................................................................. 6 REGIO ZONE CONTROLLERS............................................................................................................ 6 REGIO MIDI ............................................................................................................................... 7 Application examples ....................................................................................................... 7 CHAPTER 3 MODELS ......................................................................................................... 8 Model overview ................................................................................................................ 8 Design ............................................................................................................................... 9 CHAPTER 4 TECHNICAL DATA ......................................................................................... 10 DIMENSIONS .................................................................................................................. 10 COMMUNICATION ......................................................................................................... 10 Accessories for Regio Midi ............................................................................................. 11 CHAPTER 5 INSTALLATION PREPARATIONS ..................................................................... 12 DIFFERENT VERSIONS OF TERMINALS AND PINS ................................................................................ 12 USING LABELS ........................................................................................................................... 12 CONFIGURATION ....................................................................................................................... 13 Configuration using Regio tool© ..................................................................................... 13 Setting of DIP switches (models without display) .......................................................... 14 CALIBRATION ........................................................................................................................... 14 TROUBLESHOOTING ................................................................................................................... 14 CHAPTER 6 INSTALLATION .............................................................................................. 15 MOUNTING ............................................................................................................................. 15 WIRING .................................................................................................................................. 15 Measurement and testing during installation ................................................................ 17 Wiring for basic models with 3 universal outputs (RC-C3H, RC-C3, RC-C3O) ................ 18 Wiring for model for CO2 control (RC-C3DOC) ............................................................... 21 Wiring for model with built-in CO2 sensor (RCC-C3DOCS) .............................................. 23 Wiring for models for CO2 control and fan control (RC-C3DFOC) .................................. 25 Wiring for models for fan control (RC-CF, RC-CFO, RC-CDFO) ........................................ 27 Wiring for models for three-point control (RC-CTH, RC-CT, RC-CTO, RC-CDTO) ............ 30 CHAPTER 7 CONTROL MODES ......................................................................................... 32 DIFFERENT CONTROL MODES ....................................................................................................... 32 ADDITIONAL FEATURES ............................................................................................................... 38 CHAPTER 8 OPERATING MODES ..................................................................................... 42 DIFFERENT OPERATING MODES .................................................................................................... 42 ACTIVATION OF THE DIFFERENT OPERATING MODES .......................................................................... 44 CHAPTER 9 SETPOINT CALCULATION .............................................................................. 47 CHAPTER 10 ACTUATORS ............................................................................................... 49 CHAPTER 11 FAN CONTROL ............................................................................................ 51 CHAPTER 12 SPECIAL FUNCTIONS ................................................................................... 55 CHANGE-OVER FUNCTION ........................................................................................................... 55 FORCED VENTILATION ................................................................................................................ 55 CONDENSATION SENSOR ............................................................................................................. 56

HIGH/LOW ROOM TEMPERATURE ALARM ...................................................................................... 56 LIGHTING CONTROL................................................................................................................... 56 CHAPTER 13 INDICATIONS .............................................................................................. 57 CHAPTER 14 DISPLAY HANDLING .................................................................................... 58 DISPLAY INDICATIONS ................................................................................................................ 58 PARAMETER MENU ................................................................................................................... 59 CHAPTER 15 MEMORY FUNCTION ON POWER FAILURE ................................................... 66 CHAPTER 16 MODBUS SIGNAL TYPES .............................................................................. 67 CHAPTER 17 MODBUS SIGNALS....................................................................................... 69 DISCRETE INPUTS ...................................................................................................................... 69 COIL STATUS REGISTER ............................................................................................................... 70 INPUT REGISTER ....................................................................................................................... 71 HOLDING REGISTER ................................................................................................................... 72 CHAPTER 18 BACNET SIGNAL TYPES ................................................................................ 83 CHAPTER 19 BACNET SIGNALS ........................................................................................ 84 ANALOGUE INPUTS ................................................................................................................... 84 ANALOGUE VALUES ................................................................................................................... 84 BINARY INPUTS ........................................................................................................................ 86 BINARY VALUES ........................................................................................................................ 86 LOOP ..................................................................................................................................... 87 MULTISTATE INPUTS ................................................................................................................. 87 MULTISTATE VALUES ................................................................................................................. 87 DEVICE ................................................................................................................................... 88

Chapter 1 About the manual 5 Chapter 1 About the manual This manual describes the Regio Midi range of controllers. Terms Term used in the manual: FS Factory setting More information More information about Regio Midi can be found in: • Regio tool© Manual – Manual of how to configure the controllers The information is available for download from Regin’s website, www.regincontrols.com. The document Regio in EXO Projects, containing information on how to use Regio in the EXO system, can be downloaded from Regin’s FTP server. It is intended for our system customers who need to share files with us, e.g. at technical support. Contact one of our sales engineers to get access to the FTP server.

Regio Midi manual Chapter 2 Introduction to Regio Regio zone controllers Regio is a wide series of room controllers which handle everything from heating, cooling and ventilation to lighting, humidity, CO2 monitoring and blinds. Regio can be used for creating everything from stand-alone systems for managing the functions in one room, to large, integrated systems with a comprehensive SCADA-system. Applications The Regio controllers have a discrete design and are easy to use. They are suitable in buildings where you want optimal comfort and low energy consumption, for example offices, schools, shopping centres, airports, hotels and hospitals. Mounting The modular design with a separate bottom plate for wiring makes the whole Regio series easy to install and commission. The controllers are mounted directly on the wall or on a wall box.

Chapter 2 Introduction to Regio 7 Regio Midi Communication The controllers can be connected to a central SCADA-system via RS485 (EXOline, BACnet* or Modbus) and configured for a particular application using the configuration tool Regio tool©, which can be downloaded free of charge from Regin’s homepage www.regincontrols.com. See the manual for Regio tool© for more information. * BACnet is only available in models with display Control modes The controllers can be configured for different control modes/control sequences: • Heating • Heating or cooling via the change-over function • Heating/Heating • Heating/Cooling • Heating/ Cooling with VAV-control and forced supply air function • Heating/Cooling with VAV-control • Cooling • Cooling/Cooling • Heating/Cooling/VAV (only available in …3-models, except C3DFOC) • Heating/Heating or Cooling via change-over (only available in …F-models) • Change-over with VAV- function Application examples

Regio Midi manual Chapter 3 Models There are 12 different Midi room controllers. They can be divided according to type of control in basic models, models for fan control and models for three-point control. Model overview RC… Basic models control analogue actuators, thermal actuators or On/Off actuators with spring return. RCC… Basic models with built-in CO2 sensor. The units control analogue actuators, thermal actuators or On/Off actuators with spring return. …-C-models Models with communication. Communication via EXOline, Modbus or BACnet. Note that BACnet communication only is available for models with display. …D-models Models with display. …F-models Like basic models, models for fan control (…F-models) control analogue, thermal and spring return actuators. With the exception of RC-C3DFOC, they also have a button/fan switch and three digital outputs for control of a three-speed fan (fan coil, etc.). RC-C3DFOC has EC fan control on analogue output UO3. …H-models Models with hidden setpoint …O-models Models with occupancy button …T-models Models for three-point control (…T-models) have four digital outputs for control of two three- point actuators. …C-models C at the end. Models with input for external CO2 sensor. …3-models The …3-models have an additional output for control of either an On/Off damper, analogue forced ventilation damper, an analogue EC-fan or an analogue third damper. Models Display Occupancy button Fan control 3-point control Setpoint knob Hidden setpoint EC fan control (AO) follow cooling/heating Control of a third sequence (damper) Input for CO2 sensor CO2 sensor (built in) Basic models without fan control/three- point control (…3-models) RC-C3H ● ● ● RC-C3 ● ● ● RC-C3O ● ● ● ● RC-C3DOC ● ● ● ● ● RCC-C3DOCS ● ● ● ● ● ● Models for fan control (…F-models) RC-CF ● ● RC-CFO ● ● ● RC-CDFO ● ● ● RC-C3DFOC ● ● ● ● ● Models for three-point control (…T- models) RC-CTH ● ● RC-CT ● ● RC-CTO ● ● ● RC-CDTO ● ● ● Table 1. The Midi models and their functions

Chapter 3 Models 9 Design RC-C3H, RC-CTH RC-C3, RC-CT RC-C3O, RC-CTO RC-CDTO, RC-C3DOC, RCC-C3DOCS RC-CF RC-CFO RC-CDFO, RC-C3DFOC

Regio Midi manual Chapter 4 Technical data Supply voltage ...................................................................................... 18...30 V AC, 50...60 Hz Internal consumption ........................................................................................................ 2.5 VA Ambient temperature ...................................................................................................... 0...50°C Ambient humidity.................................................................................................. Max 90 % RH Storage temperature .................................................................................................... -20...+70°C Terminal blocks ......................................................... Lift type for cable cross-section 2.1 mm2 Protection class ..................................................................................................................... IP20 Material casing ............................................................................................... Polycarbonate, PC Colour Cover ...................................................................................................... Polar white RAL9010 Bottom plate .............................................................................................................. Light gray Weight ................................................................................................................................. 110 g Dimensions Models without setpoint knob .......................................................................... 95 x 95 x 28 mm Models with setpoint knob ............................................................................... 95 x 95 x 31 mm Communication Type ................................. RS485 (EXOline or Modbus with automatic detection or BACnet*) Communication speed ................... 9600, 19200, 38400 bps (EXOline, Modbus and BACnet*) ...................................................................................................... or 76800 bps (BACnet* only) Functions as ................................................................................................................................... Modbus ..................................................................................................................... RTU Slave BACnet ........................................................................................................................... MS/TP Modbus ........................................................ 8 bits, 1 or 2 stop bits. Odd, even (FS) or no parity Galvanically isolated port ....................................................................................................... No * BACnet is only available in models with display Memory Non-volatile (EEPROM) ...................................... All settings and configurations are preserved See also Chapter 15, Memory function on power failure. Built-in temperature sensor Type .................................................................................................. NTC, linearised, 15 kOhm Measuring range ............................................................................................................. 0...50°C Accuracy ...................................................................................................... ± 0.5°C at 15...30°C Built-in CO2 sensor Temperature dependance .... 5 ppm per °C or 5 % of the reading per °C (whichever is greater) Long term stability ..................................... < 2 % of FS over life of a sensor (15 years typical) Response time ................................................................... < 3 min. for 90 % step change typical Warm-up time .......................................... < 2 min. (operational), 10 min. (maximum accuracy) Measuring principle ............................................. NDIR (Non-Dispersive Infrared Technology) Measuring range CO2 ............................................................................................. 0…5000 ppm Accuracy .......................................................... 400…5000 ppm ± 25 ppm ± 3 % of the reading Signal update ...................................................................................................... Every 5 seconds

Chapter 4 Technical data 11 Models with display Display type ......................................................................... LCD with background illumination EMC emission and immunity standard This product conforms to the requirements of the EMC Directive 2014/35/EU through product standards EN 61000-6-1 and EN 61000-6-3. RoHS This product conforms to the Directive 2011/65/EU of the European Parliament and of the Council. Inputs AI1 ........................................................................... PT1000-sensor, 0...50°C, accuracy ± 0.1°C UI .....................................................................AI: PT1000-sensor, 0...100°C, accuracy ± 0.2°C ............................................................................................................................ or AI2: 0…10 V ....................................................................................................................... or DI: see DI below CI .................................................................................... Regin’s condensation sensor, KG-A/1 DI ..................................................... Closing potential-free contact connected to +C in one end Outputs DO ............................................................................................................... 24 V AC, max 0.5 A UO ..................................................... DO:24 V AC, max 2.0 A or AO:0...10 V DC, max 5 mA +C, power output for DI only .............................. 24 V DC, max 10mA, short circuit protected For more information about inputs and outputs, see the chapter Wiring. Accessories for Regio Midi External temperature sensors ........................ TG-R5/PT1000,TG-UH/PT1000,TG-A1/PT1000 Occupancy detector .......................................................................................................... IR24-P Relay module for -F-models .................................................................................................. RB3 Change-over .........................................................................................................TG-A1/PT1000 Condensation sensor ........................................................................................................ KG-A/1 CO2 transmitter ................................................................................................................ CO2RT Service adapter for Regio Midi ................................................................................... RC-TEST Connection plates ................................................................................................... RC-CONN:10 The accessories are available from Regin. For more information, see the product sheets and instructions for each product, search via www.regincontrols.com.

Regio Midi manual Chapter 5 Installation preparations Different versions of terminals and pins In the summer of 2008, a new terminal type was introduced in the Regio controllers. The old terminal type is dark grey and intended for 1.3 mm pins. The new terminal type is light grey and intended for 1.1 mm pins. Confusion between a new and old bottom plate may lead to deficient contact. Therefore, it is important to use an old electronics unit together with an old bottom plate and a new electronics unit together with a new bottom plate. From the end of 2017 the bottom plate will be white instead of grey. Figures 1 and 2 show an example of the difference between the old and current terminal types (the number of terminals depends on the Regio model). Figure 1. Old terminal type (1.3 mm pins) Figure 2. Current terminal type (1.1 mm pins) Using labels On the back of the electronics cassette, there is a set of labels which makes it easier to install large numbers of Midi controllers. By using the labels as carriers of information for the installation engineer, much time will be saved and you can keep wiring errors at a minimum. Figure 3. Label on the back of the controller The three-piece label can be split and the parts can be fastened to the installation drawing and the bottom plate of the controller. The label carries information on the communication address etc., and has a note area where you can enter a reference number to the connection diagram. The address on the sticker has a different meaning depending on what communication protocol is used. Model and address Field for new address or reference to connection diagram Field for room number

Chapter 5 Installation preparations 13 Example 1 If the address on the sticker is 191:183 the following addresses are valid for the different communication protocols: EXOline: PLA=191, ELA=183 Modbus: address=183 BACnet: device ID=191183 (low 4 figures=1183, high 3 figures=19), MS/TP MAC address=83* Example 2 If the address on the sticker is 10:001 the following addresses are valid for the different communication protocols: EXOline: PLA=10, ELA=1 Modbus: address=1 BACnet: device ID=10001 (low 4 figures=1, high 3 figures=1), MS/TP MAC address=1* * BACnet is only available in models with display Configuration If you want to configure the unit, it is normally better to do this before sending the electronic cassette to the installation site. The bottom plates with location and wiring information can be sent separately in advance to the installation site for electric installation. The controllers are normally configured using Regio tool©. Models with a display can be configured via the parameter menu in the display, but the easiest way to set parameters is via Regio tool©. See Configuration using Regio tool© below and the chapter Display handling. Models without a display have DIP switches for configuration. See the section DIP switches below. Configuration using Regio tool© 1. Download Regio tool© to your computer from www.regincontrols.com. 2. Connect the computer to the back of the Regio cassette with an E-cable-USB or equivalent.. The E-cable-USB is connected to terminals 42(A) and 43(B). Use a 24 V AC transformer for supply voltage of the Regio cassette on terminals 10 and 11. 3. Go to the Device manager on your computer and check which communication port that the cable has been assigned. 4. Open Regio tool© on your computer. The passwords in Regio tool© for the various access levels are 1111 (log in as administrator) and 3333 (log in as operator). For more information, see the manual for Regio tool©. 5. Go to the Tools menu in Regio tool© and choose Communication Settings and the Communication Channels window will open up. Check that the Default port is the same as assigned on the computer, otherwise change the port name in Regio tool©. 6. Each controller has a unique PLA- and ELA-address on delivery. If the PLA:ELA address is unknown, go to the Tools menu and choose Search For Controllers. This function will search through all the possible addresses until the Regio unit is detected. 7. Set the controller address under the Configuration menu. The controller address should be entered instead of the Regio tool© default address (254:30). The computer and the Regio unit should now be in contact with each other. 8. Start setting parameters and functions for the Regio. See the manual for Regio tool© for more information.

Regio Midi manual Setting of DIP switches (models without display) Models without display have eight DIP switches (SW1-8) for setting basic functions. They are found on the back of the electronics cassette. Figure 4. DIP switches SW1-2 Basic setpoint (°C) SW1 SW2 20 OFF OFF 22 (FS) OFF ON 24 ON OFF 26 ON ON Table 3. Setting of basic heating setpoint with DIP switch SW1 and SW2 See also the chapter Setpoint calculation for setting of SW1-2. SW3 Occupied is the pre-set operating mode, SW3: OFF (FS). If you want the pre-set operating mode to be Stand-by, set SW3 in mode ON. For more information, see the chapter Operating modes. SW4-8 Follow the tables in the chapter Installation for setting SW4-8. Calibration Calibration of a measured room temperature should be done under stable conditions. Troubleshooting The Manual/Auto function in Regio tool© makes it possible to test outputs. The output itself is not affected; only the software object that controls the output. This means that the built-in safety functions will not be disregarded. The controllers have different indications which can be used for troubleshooting. See the section Indications.

Chapter 6 Installation 15 Chapter 6 Installation Mounting Place the controller in a location that has a temperature representative for the room. A suitable location is approx. 1.6 m above floor level in a place with unobstructed air circulation. Remove the frame by pressing the locking tab in the lower edge of the cover with a screwdriver. See figure 5. Next, gently lift the electronics cassette out, See figure 6. Be careful not to damage the electronics. Figure 5. Figure 6. The bottom plate with terminals has several fixing hole combinations. Select suitable holes and screw the bottom plate onto the wall or connection box, so that the arrows on the bottom plate point upwards. Do not tighten the screws too hard! With surface-mounted cabling, break out suitable holes from the marks in the plastic. Wiring All units that share the same transformer and communication loop must use the same transformer-pole for G (terminal 10) and G0 (terminal 11). On the communication loop the A- terminal (terminal 42) should only be connected to another A-terminal and the B-terminal (terminal 43) to another B-terminal. Otherwise, the communication will not work.

Regio Midi manual The communication cable must be a screened twisted pair cable. The shield must be connected to G0 on one (and only one) Midi controller in each separate power supply loop with 24 V AC. If the length of the loop exceeds 300 m, a repeater is required. See figure 7. Figure 7. The figure below shows the location of the terminals. The connection diagrams and tables on the following pages show the wiring for basic models, the model for CO2 control, the model with built in CO2 sensor, models for fan control and models for three-point control. Figure 8. Examples of bottom plate with terminals For detailed information on connection of a communication cable to the Midi-controllers, see the manual Regio in EXO Projects.

Chapter 6 Installation 17 Measurement and testing during installation In order to make measurements and test the inputs/outputs of a Regio room controller during installation, Regin’s RC-TEST service adapter may be used. Simply align the pins at the bottom of the RC-TEST with the terminals contained in the controller’s socket and then plug the Regio electronics cassette into the terminals at the top of the device. Testing takes place via a standard multimeter.

Regio Midi manual Wiring for basic models with 3 universal outputs (RC-C3H, RC-C3, RC-C3O) Figure 9. Connection diagrams for basic models with 3 universal outputs Terminal Designation Operation 10 G Supply voltage 24 V AC 11 G0 Supply voltage 0 V 12-14 No function. 20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G. 21 G0 0 V common for UO. Internally connected to terminal 11, G0. 22 UO3 For VAV control alternatively For forced ventilation. 24 V AC output, max. 2.0 A. 24 V actuator is connected between terminal 22 and terminal 20, GDO. alternatively For 0…10 V DC damper control/EC-fan. The damper actuator/EC-fan 0…10 V control signal terminal is connected to terminal 22, and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively Lighting control On/Off RDAB5-24

Chapter 6 Installation 19 Terminal Designation Operation 23 UO1 Control of heating (FS) cooling or heating/cooling via change-over. For 0...10 V DC valve actuators, max 5 mA (FS). The valve actuator's 0…10 V control signal terminal is connected to terminal 23 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 23 and 20, GDO. Using DIP-switch SW8, the output can be set to suit actuator type NO or NC. N.B.: when UO1 has been set for use with thermal actuators for 24 V AC (digital output function) the controller utilizes time-proportional control to give a smooth control of the connected actuator. The output signal for UO1 can be set to NC (normally closed) or NO (normally open) by changing the position of DIP-switch SW8 for models without display and by changing parameter 73 for models with display. This setting refers to which type of actuator, NC or NO, it is intended for. For choice of output function, analogue or digital, see Table 5, SW5. On models with display, go into the parameter menu and change parameter 20 to thermal actuator. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 23 and 20. This can be configured either through the display or through Regio tool©. The output signal for UO1 can be set to NC (normally closed) or NO (normally open). 24 UO2 Control output heating or cooling (FS). For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 24 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 24 and 20, GDO. For choice of output function, analogue or digital, see Table 5, SW6. On models with display, go into the parameter menu and change parameter 21 to thermal actuator. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 24 and 20. This can be configured either through the display or through Regio tool©. 30 AI1 For an external room sensor, PT1000 or supply air temperature limitation sensor. Measuring range 0...50°C. The sensor is connected between terminals 30 and 41, AGnd. See Table 5, SW7. 31 UI1 For switching between heating and cooling on a two-pipe system (change-over). A PT1000-sensor is connected between terminals 31 and 41, AGnd. Measuring range: 0...100°C. alternatively For a potential-free contact. A potential-free contact is connected between terminals 31 and 40, +C. 32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact corresponds to occupancy. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. See also the section Occupancy detector in the chapter Operating modes.

Regio Midi manual Terminal Designation Operation 33 DI2/CI Regin’s condensation sensor, KG-A/1 (FS). The sensor is connected between terminals 33 and 41, AGnd. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Run indication from e.g. an air handling unit. A potential-free contact is connected between terminals 33 and 40, +C. See Table 5, SW4. 40 +C 24 V DC out common for DI and UI (with digital function) 41 AGnd Analogue ground, reference for AI and UI (with analogue function) 42 A RS485-communication A 43 B RS485-communication B Table 4. I/O connection terminals for basic models with 3 analogue outputs DIP switches (only models without display) The ON-position is marked on the DIP switch. ON OFF Comment SW4 DI, window contact. Closed contact indicates closed window. CI, Regin’s condensation sensor, KG-A/1 (FS). Function terminal 33, DI2/CI. SW5 Digital output for 24 V AC thermal actuator. Analogue output for 0...10 V DC valve actuator (FS). Function terminal 23, UO1. SW6 Digital output for 24 V AC thermal actuator. Analogue output for 0...10 V DC valve actuator (FS). Function terminal 24, UO2. SW7 External, PT1000-sensor. Internal NTC-sensor (FS). Temperature sensor. SW8 NO NC (FS) Function terminal 23, UO1 Choosing NC (FS) gives direct action on output UO1, i.e. increasing signal (longer pulses) on increasing control output. This setting is used when UO1 is connected to a thermal actuator of type Regin RTAM-24 (NC). In the event of a power cut the valve will close. Choosing NO gives reverse action on output UO1, i.e. decreasing signal (shorter pulses) on increasing control output. This setting is used when UO1 is connected to a thermal actuator of type Regin RTAOM-24 (NO). In the event of a power cut the valve will open. Table 5. DIP switches SW4-SW8

Chapter 6 Installation 21 Wiring for model for CO2 control (RC-C3DOC) Figure 10. Connection diagrams for model for CO2 control Terminal Designation Operation 10 G Supply voltage 24 V AC 11 G0 Supply voltage 0 V 12-14 No function. 20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G. 21 G0 0 V common for UO. Internally connected to terminal 11, G0. 22 UO3 Output for VAV or EC-fan. For forced ventilation. 24 V AC output, max. 2.0 A. 24 V actuator is connected between terminal 22 and terminal 20, GDO. alternatively For 0…10 V DC damper control/EC-fan. The damper actuator/EC-fan 0…10 V control signal terminal is connected to terminal 22 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively Lighting control On/Off. RDAB5-24

Regio Midi manual Terminal Designation Operation 23 UO1 Control output heating (FS), cooling or heating or cooling via change-over. For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 23 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 23 and 20, GDO. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 23 and 20. This can be configured either through the display or through Regio tool©. The output signal for UO1 can be set to NC (normally closed) or NO (normally open). 24 UO2 Control output heating or cooling (FS). For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 24 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 24 and 20, GDO. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 24 and 20. This can be configured either through the display or through Regio tool©. 30 AI1 For an external room sensor or supply air temperature, PT1000. Measuring range 0...50°C. The sensor is connected between terminals 30 and 41, AGnd. 31 AI2 For a 0…10 V CO2 sensor alternatively Flow input alternatively 0…10 V input 32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact corresponds to occupancy. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Change-over. 33 DI2/CI Regin’s condensation sensor, KG-A/1 (FS). The sensor is connected between terminals 33 and 41, AGnd. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Change-over. alternatively Run indication from e.g. an air handling unit. A potential-free contact is connected between terminals 33 and 40, +C. 40 +C 24 V DC out common for DI and UI (with digital function) 41 AGnd Analogue ground, reference for AI and UI (with analogue function) 42 A RS485-communication A 43 B RS485-communication B Table 6. I/O connection terminals for model for CO2 control

Chapter 6 Installation 23 Wiring for model with built-in CO2 sensor (RCC-C3DOCS) Figure 11. Connection diagrams for model with built-in CO2 sensor Terminal Designation Operation 10 G Supply voltage 24 V AC 11 G0 Supply voltage 0 V 12-14 No function. 20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G. 21 G0 0 V common for UO. Internally connected to terminal 11, G0. 22 UO3 Output for VAV or EC-fan. For forced ventilation. 24 V AC output, max. 2.0 A. 24 V actuator is connected between terminal 22 and terminal 20, GDO. alternatively For 0…10 V DC damper control/EC-fan. The damper actuator/EC-fan 0…10 V control signal terminal is connected to terminal 22 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively Lighting control On/Off. 23 UO1 Control output heating (FS), cooling or heating or cooling via change-over. For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 23 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 23 and 20, GDO. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 23 and 20. This can be configured either through the display or through Regio tool©. The output signal for UO1 can be set to NC (normally closed) or NO (normally open).

Regio Midi manual Terminal Designation Operation 24 UO2 Control output heating or cooling (FS). For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 24 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 24 and 20, GDO. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 24 and 20. This can be configured either through the display or through Regio tool©. 30 AI1 For an external room sensor or supply air temperature, PT1000. Measuring range 0...50°C. The sensor is connected between terminals 30 and 41, AGnd. 31 AI2 For a 0…10 V CO2 sensor alternatively Flow input alternatively 0…10 V input 32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact corresponds to occupancy. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. 33 DI2/CI Regin’s condensation sensor, KG-A/1 (FS). The sensor is connected between terminals 33 and 41, AGnd. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Run indication from e.g. an air handling unit. A potential-free contact is connected between terminals 33 and 40, +C. 40 +C 24 V DC out common for DI and UI (with digital function) 41 AGnd Analogue ground, reference for AI and UI (with analogue function) 42 A RS485-communication A 43 B RS485-communication B Table 7. I/O connection terminals for model with built in CO2 sensor

Chapter 6 Installation 25 Wiring for models for CO2 control and fan control (RC-C3DFOC) Figure 12. Connection diagrams for models for CO2 control and fan control Terminal Designation Operation 10 G Supply voltage 24 V AC 11 G0 Supply voltage 0 V 12-14 No function. 20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G. 21 G0 0 V common for UO. Internally connected to terminal 11, G0. 22 UO3 Control EC fan, 0…10 V DC. 23 UO1 Control output heating (FS), cooling or heating or cooling via change-over. For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 23 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 23 and 20, GDO. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 23 and 20. This can be configured either through the display or through Regio tool©. The output signal for UO1 can be set to NC (normally closed) or NO (normally open).

Regio Midi manual Terminal Designation Operation 24 UO2 Control output heating, cooling (FS) or heating or cooling via change-over. For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 24 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 24 and 20, GDO. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 24 and 20. This can be configured either through the display or through Regio tool©. 30 AI1 For an external room sensor or supply air temperature limitation sensor, PT1000. Measuring range 0...50°C. The sensor is connected between terminals 30 and 41, AGnd. 31 AI2 For a 0…10 V CO2 sensor alternatively Flow input alternatively 0…10 V input 32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact corresponds to occupancy. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Change-over. 33 DI2/CI Regin’s condensation sensor, KG-A/1 (FS). The sensor is connected between terminals 33 and 41, AGnd. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Change-over. alternatively Run indication from e.g. an air handling unit. A potential-free contact is connected between terminals 33 and 40, +C. 40 +C 24 V DC out common for DI and UI (with digital function) 41 AGnd Analogue ground, reference for AI and UI (with analogue function) 42 A RS485-communication A 43 B RS485-communication B Table 8. I/O connection terminals for CO2 control and fan control

Chapter 6 Installation 27 Wiring for models for fan control (RC-CF, RC-CFO, RC-CDFO) Figure 13. Connection diagrams for models for fan control Terminal Designation Operation 10 G Supply voltage 24 V AC 11 G0 Supply voltage 0 V 12 DO1 For fan control, low speed. 24 V AC output, max 0.5 A. A 24 V AC relay is connected between terminal 12 and terminal 20, GDO. 13 DO2 For fan control, medium speed. 24 V AC output, max 0.5 A. A 24 V AC relay is connected between terminal 13 and terminal 20, GDO. 14 DO3 For fan control, high speed. 24 V AC output, max 0.5 A. A 24 V AC relay is connected between terminal 14 and terminal 20, GDO. 20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G. 21 G0 0 V common for UO. Internally connected to terminal 11, G0. 22 DO4 For forced ventilation. 24 V AC output, max 0.5 A. A 24 V AC actuator is connected between terminal 22 and terminal 20, GDO. RDAB5-24

Regio Midi manual Terminal Designation Operation 23 UO1 Control of heating (FS), cooling or heating/cooling via change-over. For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator's 0…10 V control signal terminal is connected to terminal 23 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2.0 A. The thermal actuator is connected between terminals 23 and 20, GDO. Using DIP-switch SW8, the output can be set to NO or NC. N.B: when UO1 has been set for use with thermal actuators for 24 V AC (digital output function) the controller utilizes time-proportional control to give a smooth control of the connected actuator. The output signal for UO1 can be set to NC (normally closed) or NO (normally open) by changing the position of DIP-switch SW8 for models without display and by changing parameter 73 for models with display. This setting refers to which type of actuator, NC or NO, it is intended for. For choice of output function, analogue or digital, see Table , SW5. On models with display, go into the parameter menu and change parameter 20 to thermal actuator. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 23 and 20. This can be configured either through the display or through Regio tool©. The output signal for UO1 can be set to NC (normally closed) or NO (normally open). 24 UO2 Control of heating, cooling (FS) or heating/cooling via change-over. For a 0...10 V DC valve actuator, max 5 mA (FS). The valve actuator’s 0…10 V control signal terminal is connected to terminal 24 and its supply terminals to terminals 10 and 11. Make sure that the reference pole G0 is connected to the correct terminal on the actuator. alternatively For a 24 V AC thermal actuator, max 2,0 A. The thermal actuator is connected between terminals 24 and 20, GDO. For choice of output function, analogue or digital, see Table , SW6. On models with display, go into the parameter menu and change parameter 21 to thermal actuator. alternatively For a 24V AC actuator with spring return, max. 2.0 A. The actuator is connected between terminals 24 and 20. This can be configured either through the display or through Regio tool©. 30 AI1 For an external room sensor or supply air temperature limitation sensor, PT1000. Measuring range 0...50°C. The sensor is connected between terminals 30 and 41, AGnd. See Table , SW7. 31 UI1 For switching between heating and cooling on a two-pipe system (change- over). A PT1000-sensor is connected between terminals 31 and 41, AGnd. Measuring range: 0...100°C. alternatively For a potential-free contact. A potential-free contact is connected between terminals 31 and 40, +C. 32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact corresponds to occupancy. alternatively Window contact (DI). A potential-free contact is connected between terminals 32 and 40, +C. Closed contact indicates closed window. See also the section Occupancy detector in the chapter Operating modes.

Chapter 6 Installation 29 Terminal Designation Operation 33 DI2/CI Regin’s condensation sensor, KG-A/1 (FS). The sensor is connected between terminals 33 and 41, AGnd. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Run indication from e.g. an air handling unit. A potential-free contact is connected between terminals 33 and 40, +C. See Table , SW4. 40 +C 24 V DC out common for DI and UI (with digital function) 41 AGnd Analogue ground, reference for AI and UI (with analogue function) 42 A RS485-communication A 43 B RS485-communication B Table 9. I/O connection terminals for models for fan control DIP switches (only models without display) The ON-position is marked on the DIP switch. ON OFF Comment SW4 DI, window contact. Closed contact indicates closed window. CI, Regin’s condensation sensor, KG-A/1 (FS). Function terminal 33, DI2/CI. SW5 Digital output for 24 V AC thermal actuator. Analogue output for 0...10 V DC valve actuator (FS). Function terminal 23, UO1. SW6 Digital output for 24 V AC thermal actuator. Analogue output for 0...10 V DC valve actuator (FS). Function terminal 24, UO2. SW7 External, PT1000-sensor. Internal NTC-sensor (FS). Temperature sensor. SW8 NO NC (FS) Function terminal 23, UO1 Choosing NC (factory setting) gives direct action on output UO1, i.e. increasing signal (longer pulses) on increasing control output. This setting is used when UO1 is connected to a thermal actuator of type Regin RTAM-24 (NC). In the event of a power cut the valve will close. Choosing NO gives reverse action on output UO1, i.e. decreasing signal (shorter pulses) on increasing control output. This setting is used when UO1 is connected to a thermal actuator of type Regin RTAOM-24 (NO). In the event of a power cut the valve will open. Table 10. DIP switches SW4-SW8

Regio Midi manual Wiring for models for three-point control (RC-CTH, RC-CT, RC-CTO, RC-CDTO) Figure 14. Connection diagrams for models for three-point control Terminal Designation Operation 10 G Supply voltage 24 V AC 11 G0 Supply voltage 0 V 12 DO1 For forced ventilation. 24 V AC output, max 0.5 A. A 24 V AC actuator is connected between terminal 12 and terminal 20, GDO. 13 DO2 For a three-point actuator, heating increase. 24 V AC output, max 0.5 A. The actuator’s terminal for opening signal is connected to terminal 13. The common pole on the actuator is connected to terminal 20, GDO. 14 DO3 For a three-point actuator, heating decrease. 24 V AC output, max 0.5 A. The actuator’s terminal for closing signal is connected to terminal 14. 20 GDO 24 V AC out common for DO. Internally connected to terminal 10, G. 21 G0 0 V common for DO. Internally connected to terminal 11, G0. 22 DO4 For a three-point actuator, cooling increase. 24 V AC output, max 0.5 A. The actuator’s terminal for opening signal is connected to terminal 22. The common pole on the actuator is connected to terminal 20, GDO. 23 DO5 For a three-point actuator, cooling decrease. 24 V AC output, max 0.5 A. The actuator’s terminal for closing signal is connected to terminal 23. 24 No function. 30 AI1 For an external room sensor or supply air temperature limitation sensor, PT1000. Measuring range 0...50°C. The sensor is connected between terminals 30 and 41, AGnd. See Table 1, SW7. RDAB5-24

Chapter 6 Installation 31 Terminal Designation Operation 31 UI1 For switching between heating and cooling on a two-pipe system (change- over). A PT1000-sensor is connected between terminals 31 and 41, AGnd. Measuring range: 0...100°C. alternatively For a potential-free contact. A potential-free contact is connected between terminals 31 and 40, +C. 32 DI1 Occupancy detector. A potential-free contact is connected between terminals 32 and 40, +C. Closed contact corresponds to occupancy. alternatively Window contact (DI). A potential-free contact is connected between terminals 32 and 40, +C. Closed contact indicates closed window. See also the section Occupancy detector in the chapter Operating modes. 33 DI2/CI Regin’s condensation sensor, KG-A/1 (FS). The sensor is connected between terminals 33 and 41, AGnd. alternatively Window contact (DI). A potential-free contact is connected between terminals 33 and 40, +C. Closed contact indicates closed window. alternatively Run indication from e.g. an air handling unit. A potential-free contact is connected between terminals 33 and 40, +C. See Table 1, SW4. 40 +C 24 V DC out common for DI and UI (with digital function) 41 AGnd Analogue ground, reference for AI and UI (with analogue function) 42 A RS485-communication A 43 B RS485-communication B Table 11. I/O connection terminals for models for three-point control DIP switches (only models without display) The ON-position is marked on the DIP switch. ON OFF Comment SW4 DI, window contact. Closed contact indicates closed window. CI, Regin’s condensation sensor, KG-A/1 (FS). Function terminal 33, DI2/CI. SW5 DO5 activated (FS). Not permitted. Shall be ON. SW6 Not used. SW7 External, PT1000-sensor. Internal NTC-sensor (FS). Temperature sensor. SW8 NO NC (FS) Function terminal 23, UO1 Choosing NC (factory setting) gives direct action on output UO1, i.e. increasing signal (longer pulses) on increasing control output. This setting is used when UO1 is connected to a thermal actuator of type Regin RTAM-24 (NC). In the event of a power cut the valve will close. Choosing NO gives reverse action on output UO1, i.e. decreasing signal (shorter pulses) on increasing control output. This setting is used when UO1 is connected to a thermal actuator of type Regin RTAOM-24 (NO). In the event of a power cut the valve will open. Table 12. DIP switches SW4-SW8

Regio Midi manual Chapter 7 Control modes Different control modes The controllers can be configured for different control modes/control sequences. Depending on which control mode is active, one, both or all three of the universal outputs, UO1, UO2 and UO3, are used. See Table 13 below for a summary. Control mode UO1* UO2* UO3** Heating Heating - Forced ventilation (digital), Lighting control, Analogue, 0...10 V (VAV damper), EC fan Heating/Heating (split output signal) Heating Heating Heating or cooling via change-over Heating or cooling - Heating/Cooling Heating Cooling Heating/Cooling with VAV-control and forced supply air function Heating Cooling Heating/Cooling with VAV-control Heating Cooling Cooling Cooling Cooling Cooling/Cooling (split output signal) Cooling Cooling Heating/Cooling/VAV (only available in -C3- models, except C3DFOC) Heating Cooling Heating/Heating or Cooling via change- over (only available in fan models) Heating Cooling Change over with VAV-function Heating or cooling Cooling Table 13. Control modes * Not available in …T-models. ** Only available in …3-models. Control mode 0: Heating In control mode Heating, the unit is always a heating controller and controls according to the heating setpoint plus/minus the setpoint adjustment. The setpoint can be adjusted in the display or via the setpoint knob. Control mode 1: Heating/Heating Split output signal In control mode Heating/Heating, the controller is always a heating controller and controls according to the basic heating setpoint plus the setpoint adjustment. The control signal is divided between the two outputs with a deadband in between. The first output (UO1) works between 0...48 % of the control signal. When the control signal reaches 52 %, UO2 starts to operate and will be 10 V when the control signal is 100 %. See the figure below:

Chapter 7 Control modes 33 Output signal Heating 2 Heating 1 0 % 100 % 100 % 48 % 52 % Heating demand Control mode 2: Heating or cooling via change-over This control mode is used for installations with 2-pipe systems. It makes it possible to use the same pipe for both heating and cooling, depending on whether heating or cooling is required. Switching between heating and cooling mode can be performed either by using a digital or an analogue input. Only one output is used to control the actuator (UO1). See more in the chapter Change-over function. Control mode 3: Heating/Cooling In control mode Heating/Cooling, the controller functions as a heating controller when the room temperature is lower than the basic heating setpoint plus half the neutral zone. The neutral zone is the difference in temperature between the heating setpoint and the cooling setpoint. When the room temperature exceeds this limit, the controller becomes a cooling controller. There is a hysteresis of 0.1°C when the controller changes from heating to cooling controller and vice versa. When the controller is heating, it regulates according to the basic heating setpoint plus the setpoint adjustment, and when it is cooling according to the basic cooling setpoint plus the setpoint adjustment. Output signal Cooling Heating 0 % Temp (°C) 100 % SP heating SP cooling Neutral zone Control mode 4: Heating/Cooling with VAV-control and forced supply air function Like control mode Heating/Cooling but the cooling output is controlling a supply air damper (sub-tempered supply air). When the ventilation is forced (See Chapter 12, Special functions), the cooling output is set to full cooling (full supply air volume), regardless of what the controller output signal is. For VAV control, several basic flows exist for supply air depending on the current running mode.

Regio Midi manual Factory settings: • Presence (Occupied): 20 % • Standby and no presence (Unoccupied): 10 % • Off: 0 % A max limitation for cooling is available for Heating/Cooling with VAV-control and forced supply air function. The max limitation is configured 0...100 %, where 0 means the damper is entirely closed and 100 that the damper is entirely open. The function is activated by configuring the appropriate parameter to a value less than 100. The cooling limitation is present in control modes 4, 5 and 8. Control mode 5: Heating/Cooling with VAV-control Heating and cooling are controlled in the same way as in the VAV-control above. The damper cannot be forced like above. There is also a function that opens the supply air damper on heating demand. This is normally always required if the heater is placed in the supply air duct, to carry the heat to the room. A maximum limit is set for the opening of the damper on heating demand. The factory setting is zero, which means that the function to open the damper on heating demand is not active. The basic flow can also be set separately. For VAV control, several basic flows exist for supply air depending on the current running mode. Factory settings: • Presence (Occupied): 20 % • Standby and no presence (Unoccupied): 10 % • Off: 0 % A max limitation for both cooling and heating is available for Heating/Cooling with VAV- control. The max limitation is configured 0...100 %, where 0 means the damper is entirely closed and 100 that the damper is entirely open. The function is activated by configuring the appropriate parameter to a value less than 100. The cooling limitation is present in control modes 4, 5 and 8. The heating limitation is present in control modes 5 and 8. Max airflow on heating demand (settable) Output signal Cooling Heating 0 % Temp (°C) 100 % Basic airflow (settable) Heating output Cooling output Increasing airflow on heating demand SP heating SP cooling Control mode 6: Cooling In control mode Cooling, the unit is always a cooling controller and controls according to the basic cooling setpoint plus the setpoint adjustment.

Chapter 7 Control modes 35 Control mode 7: Cooling/Cooling Split output signal In control mode Cooling/Cooling, the controller always functions as a cooling controller and controls according to the basic cooling setpoint plus the setpoint adjustment. The control signal is divided between the two outputs with a deadband in between. The first output (UO1) works between 0...48 % of the control signal. When the control signal reaches 52 %, UO2 starts to operate and will be 10 V when the control signal is 100 %. See the figure below: Output signal Cooling 2 Cooling 1 0 % 100 % 100 % 48 % 52 % Cooling demand Control mode 8: Heating/Cooling/VAV This control mode offers the possibility to control three analogue outputs: heating, cooling and VAV. When the controller is in cooling mode, the control signal is split between cooling and VAV (this control mode is only available in …C3 models, except RC-C3DFOC), see figure below: To avoid Y2 and Y3 opening and closing frequently during switch-over, a saddle point is implemented. Y2 will output 0…10 V (linear) when the controller output is 0…48 % and Y3 will output 0…10 V (linear) when the controller output is 52…100 %. In the saddle point, the outputs will always be 100 % for Y2 and 0 % for Y3. As an addition to the function described above, it is possible to connect a CO2 sensor to RC- C3DOC or use the built-in CO2 sensor in RCC-C3DOCS. The output on Y3 will then be affected by either cooling demand or by the CO2 level rising too high. The output from the CO2 function is linear between two user-defined setpoints (see figure below). A max limitation for both cooling and heating is available for Heating/Cooling/VAV-control. The max limitation is configured 0...100 %, where 0 means the damper is entirely closed and 100 that the damper is entirely open. The function is activated by configuring the appropriate parameter to a value less than 100. The cooling limitation is present in control modes 4, 5 and 8. The heating limitation is present in control modes 5 and 8.

Regio Midi manual The variable for the min. limit of the VAV-damper is the same as for the VAV-damper in the VAV control applications on Y2. Default is 20 % min. limit. Reversed sequence In some applications, e.g. free cooling, it may be desirable to reverse the sequence of Y2 and Y3 (i.e., to open Y3 before Y2). This function is a configuration of the control mode Heating/Cooling/VAV. When the function is active, the sequence of Y2 and Y3 will be reversed, i.e. Y3 will open 0…100 % when controller output is in the range of 0…48 % and Y2 will open 0…100 % when the controller output is 52…100 %. See the figure below: At forced ventilation, Y3 will open fully as before, and Y2 will control depending on temperature. However, Y2 will not give any output unless the controller output is above 52 %.

Chapter 7 Control modes 37 This function is only valid for models with Y3 output. For VAV control, several basic flows exist for supply air depending on the current running mode. Factory settings: • Presence (Occupied): 20 % • Standby and no presence (Unoccupied): 10 % • Off: 0 % Control mode 9: Heating/Heating or cooling via change- over For models offering fan functionality (excluding RC-C3DFOC), a function for control of a heating battery on UO1 in sequence with change-over on UO2 is available. When this has been performed, the start sequence of UO1/UO2 is changed along with the limits for fan start. The change-over function will be used to switch between summer and winter mode. UO2 will be used as a cooling actuator in summer mode and as a heating actuator in winter mode. In summer mode, Regio will function as a regular heating/cooling controller. In winter mode, Regio will function as a heating/heating controller. UO2 will initiate first and UO1 second. The electrical heating battery connected to UO1 will start only if the ordinary heat battery on UO2 cannot meet the heating demand. When a heating demand exists, the output of UO2 is 0…100 % linear to the heating demand 0…48 % and UO1 0…100 % to the heating demand 52…100 %. When the heating demand is 48…52 % UO2 will always output 100 % and UO1 0 %.

Regio Midi manual As the electrical heater is connected to UO1, and since an electrical heater may become very hot, a fan stop delay has been implemented into the system. The fan stop delay will only be activated in heating mode, and then only if the fan has been running prior to the stop. When the heat output has been set to 0 %, the fan will continue to run for an additional 120 s, at the same speed it had prior to stopping. It is very important to note that Regio does not have any built-in function for monitoring when the fan is running or if the heat battery is overheating. This function must instead be provided by a supervisory system. Control mode 10: Change-over with VAV function This control mode is used when room temperature is controlled via VAV and the same duct is used for both warm and under-tempered air. Change-over takes place on UO1. Min/max limitations are active. CO2 control is also active and operates according to a linear function. For the system to function properly, the change-over sensor must be used to measure duct air temperature. For more information see chapter 12: Change-over. Min and max supply air limitation Analogue input 1 (AI1) can be configured for use with a supply air temperature limitation sensor. The controller will then automatically switch to cascade control. There are four values for min and max limitation. The settable range is 10...50°C. The default setting is: Control mode Min limitation Max limitation Heating 24°C 35°C Cooling 12°C 24°C A room controller will then work together with a supply air temperature controller using cascade control, resulting in a calculated supply air temperature maintaining the room temperature setpoint. The cascade factor consists of the supply air controller being faster than the room controller. The cascade factor in Regio Midi acts as a divisor which affects both the P-band and I-time. Example: If the cascade factor is 3 and the room controller has a P-band of 10°C and an I- time of 300 s, the supply air controller will receive a P-band of 3°C and an I-time of 100 s. The supply air controller will therefore be 3 times as fast as the room controller. Additional features CO2 sensor and VAV control (RC-C3DOC, RCC- C3DOCS, RC-C3DFOC) RC-C3DOC, RCC-C3DOCS and RC-C3DFOC can be set to all of the above control modes. When RC-C3DOC, RCC-C3DOCS or RC-C3DFOC are set to VAV control, the control mode is combined with a CO2 control function. In control mode Heating/Cooling with VAV-control, the CO2 concentration in the room will make the VAV damper, cooling output UO2, open. The function is linear and the damper works between the configured min. flow (FS=20 %) and 100 %, depending on the CO2 concentration in the room. If the CO2 concentration drops below the configured min. limit, the damper will stay on the minimum allowed air flow. When the CO2 concentration rises, the damper will open linearly until reaching the configured CO2 max. value, at which point it will be 100 % open.

Chapter 7 Control modes 39 Minimum limit on analogue 0…10 V actuators The minimum limitation on the analogue output is only active in Bypass, Occupied and Standby. If the operating mode is Unoccupied or Off, the damper will be closed (0 V on the analogue output). See table below: Operating mode Min. limit VAV output (Y2) Bypass 20 % 2 V Occupied 20 % 2 V Standby 20 % 2 V Unoccupied 20 % 0 V Off 20 % 0 V Many damper actuators have a working range of 2...10 V. This means that to set a minimum limitation of 20 %, the min. limitation in the Regio will have to be set to 36 % . Forced ventilation depending on the heating/cooling output At 100 % heating or cooling output, forced ventilation can be activated. The function is intended to be used when the heater or cooler is located in the ventilation duct and the system is struggling to reach the setpoint. When the cooling or heating output reaches 100 %, the controller will switch to control mode Bypass. The controller will remain in forced ventilation throughout the set Bypass time (FS=2h). Three different alternatives can be selected for setting the function forced ventilation: • Not active (FS) • Forced ventilation at 100% heating or cooling output • Forced ventilation at 100% cooling output

Regio Midi manual Presence detection depending on the CO2 concentration This function is not active when the controller is configured for Heating/Cooling with VAV- control. When the CO2 concentration exceeds the set value for activation of presence, UO3 will switch to forced ventilation if the presence operating mode is set to Bypass. It will stay there until the concentration drops below the set value (FS=800ppm) minus the hysteresis (FS=160ppm). When the concentration drops below this value, the controller will remain in presence mode for the duration of the configured occupancy off-delay (FS=10min). Minimum limit for the heating output In some applications, it is desirable to set a minimum limit for the heating output in order to prevent, for instance, downdraughts under windows. In general, this function works in a way similar to the minimum limit for the cooling output. However, there is a difference between the minimum limit for the heating and cooling output as the minimum limit for the latter still remains active after the controller enters heating mode. In addition, the minimum limitation for the heating output functions in all control modes.

Chapter 7 Control modes 41 Features for RC-C3DOC, RCC-C3DOCS, C3DFOC 0…10 V input The 0…10 V input used as a CO2 input for RC-C3DOC, RCC-C3DOCS and RC-C3DFOC supports a general 0…10 V signal. This input is not connected to any function but only acts as a read-out for the signal. To configure this option, parameter 81 is set to option 7, “0…10 V”. Flow input AI2 may be configured as a flow calculation input. A flow corresponding to 0 V and one corresponding to 10 V is set, and the flow is then calculated linearly between these two end points. To configure the flow calculation, Parameter 81 has the additional option 8, “Flow calculation”. The calculated flow value may be shown in the display by setting parameter 42 to option 9.

Regio Midi manual Chapter 8 Operating modes Different operating modes The Regio controllers have the following operating modes: • 0 = Off • 1 = Unoccupied • 2 = Stand-by • 3 = Occupied (FS) • 4 = Bypass Off Operating mode Off means that the controller is not heating or cooling, and the fans are stopped. However, the temperature must not drop below the set minimum temperature (FS=8°C). If it does, the controller will start heating, and (if a fan is used) start the fan whether it has been manually stopped or not. For controllers with display the background lighting is not lit, and only OFF is shown in the display. Unoccupied Operating mode Unoccupied means that the room where the controller is placed is not used for an extended period of time, for example during holidays or long weekends. Both heating and cooling are disconnected and the fans are stopped within a temperature interval with configurable min/max temperatures (FS min=15°C, max=30°C). For controllers with display the background lighting is not lit, but the current room temperature (or setpoint depending on the configuration) is shown in the display. OFF is also shown in the display. Stand-by Operating mode Stand-by means that the room is in an energy save mode and is not used at the moment. This can be during nights, weekends, evenings etc. The controller is prepared to change operating mode to Occupied (comfort) if someone enters the room (presence). The room temperature is controlled around the applicable heating and cooling setpoints, with an extended temperature interval (FS= ± 3°C). For example, if the heating setpoint=22°C and the cooling setpoint=24°C, the controller will allow the temperature in the room to be between 19°C and 27°C. The setpoints can also be adjusted ± 3°C via the setpoint knob or the display. For controllers with display the background lighting is lit (dimmed). STANDBY and the current room temperature (or setpoint depending on the configuration) are shown in the display.

Chapter 8 Operating modes 43 Occupied Operating mode Occupied means that the room is in use and is therefore in a comfort mode. The controller regulates the room temperature around a heating setpoint and a cooling setpoint (FS heating setpoint=22°C, cooling setpoint=24°C). The setpoints can also be adjusted ± 3°C locally via the setpoint knob or in the display, or via a central command. For controllers with display the background lighting is lit (dimmed), and the occupancy indication is shown (see the chapter Display handling). The current room temperature (or setpoint depending on the configuration) is also shown in the display. Bypass Operating mode Bypass means that the controller controls the room temperature in the same way as in operating mode Occupied. The output for forced ventilation is also active. After a configurable time (FS=2 hours) in Bypass, the controller automatically returns to the pre-set operating mode. Bypass is normally activated when the Occupancy button is pressed, via an occupancy detector, a central command or the CO2 level. The operating mode is useful for example in conference rooms, where many people are present at the same time for a certain period of time. For controllers with display the background lighting is lit (dimmed). The occupancy indication and the symbol for forced ventilation are shown (see the chapter Display handling). The current room temperature (or setpoint depending on the configuration) is shown in the display. The bypass timer can be set to work as a switch-off delay, determining the time that “Bypass” should be active (FS=120 min). Alternatively, a settable timer can be configured via the display. In this case, each press of the occupancy button will change the timer as follows: Off  1h  2h  3h  4h  5h  Off. Control modes Depending on various settings and values, the controller will be set to different control modes using different setpoints:

Regio Midi manual Activation of the different operating modes Pre-set operating mode The pre-set operating mode is configured to Occupied by default. On models without display the pre-set mode can be changed to Stand-by using DIP switch SW3. OFF (FS): Occupied, ON: Stand-by. On models with display, this is configured in the parameter menu in the display, parameter 45. The operating mode is changed at the following events: • When the Occupancy button is pressed (if the controller has an Occupancy button). • Activation/deactivation of an occupancy detector on the digital input. • Activation/deactivation of presence by CO2 level (for model with CO2 detection) • Via central control, for example central time control, central booking system etc. Occupancy button For models without fan control, the occupancy button push time for Shutdown is 5 s as a default. It is configurable via Regio tool©. When pressing the occupancy button, the controller is set to forced ventilation. If the button is pressed again when forced ventilation is active, the controller will switch to the default running mode which can be configured either to Off, Unoccupied, Standby or Occupied. When the Occupancy button is held depressed for more than 5 seconds, the controller will change its operating mode to Shutdown (Off/Unoccupied), regardless of the present operating mode. Via the display or Regio tool©, it is possible to configure which operating mode (Off or Unoccupied) should be activated upon Shutdown (FS=Unoccupied). Shutdown If the Occupancy button is pressed for less than 5 seconds when the controller is in its pre-set operating mode or in Shutdown, the controller will change to Bypass. If the button is then depressed for less than 5 seconds, the controller will return to the pre-set operating mode. After a configurable period of time in Bypass (FS=2 hours), the controller will return to the pre-set operating mode. For models with fan control (RC-CF/CFO/CDFO/C3DFOC), the Occupancy button Shutdown push time is 0 s as a default. This value is configurable via Regio tool©. Because of the default 0 s setting, switching operating modes by depressing the Occupancy button functions differently: If the Occupancy button is pressed when the controller is in the pre-set operating mode or in Bypass mode, the controller will change to Shutdown. If the Occupancy button is pressed in Shutdown mode, the controller will switch to Bypass. After a configurable period of time in Bypass (FS=2 hours), the controller will return to the pre-set operating mode.

Chapter 8 Operating modes 45 For handling of the Occupancy button in combination with central control, please see the section entitled Central control, below. Occupancy detector For local control of the operating mode between the pre-set operating mode and Bypass or Occupied, an occupancy detector is connected. When occupancy is indicated, the controller changes operating mode to Bypass or Occupied. If you want to be able to enter the room temporarily without activating Presence (to, for example, pick something up) it is possible to configure a power-up delay. This means that Presence is not activated until the power-up delay has expired. The Presence delay can be set to a value between 0 and 60 minutes (FS=0 min). In Bypass on presence, there is a switch-off timer, which means that if there is no occupancy indication during this time (FS=10 min), the controller will return to the pre-set operating mode.

Regio Midi manual Central control Central control of the operating mode is also possible. By changing the variable RegioRemoteState, you can control the operating mode centrally according to the following table (there is a variable list for central control in Part IV of this manual): RegioRemoteState Description 0 Central operating mode Off 1 Central operating mode Unoccupied 2 Central operating mode Standby 3 Central operating mode Occupied 4 (Not used) 5 (FS) No central control Table 14. The variable RegioRemoteState The occupancy button When using central control (i. e. RegioRemoteState <> 5) and you press the Occupancy button, the controller will change to Bypass and stay in this mode for as long time as you have configured. If you press the Occupancy button again when the controller is in Bypass, the controller will change to Stand-by, regardless of what has been set in the central control (RegioRemoteState). When the controller is in Bypass and the Bypass time has run out, the controller will change to the operating mode given by RegioRemoteState. If RegioRemoteState equals 5 it will change to the pre-set operating mode. If the controller is in Stand-by and the central control is changed, the controller will change to this new operating mode. Occupancy detector When central control is used and the occupancy detector is activated, the controller will go to Bypass for a configurable time, and thereafter return to the central operating mode. Central command Via central commands from a comprehensive system, for example EXO4, you can handle the controller in the same way as you handle it locally via the Occupancy button, i. e. you can change its operating mode to Off/Unoccupied (Shutdown) or Bypass. Central commands should be regarded as events and can be changed locally via the Occupancy button. Off/Unoccupied Bypass Command Bypass Command ”Shutdown”

Chapter 9 Setpoint calculation 47 Chapter 9 Setpoint calculation Basic setpoint There are two basic setpoints, one basic heating setpoint (FS=22°C) and one basic cooling setpoint (FS=24°C). Units without display have DIP switches to change the setpoints (see Table 3). The basic cooling setpoint is automatically changed at the same time. Therefore, the difference between the basic heating setpoint and the basic cooling setpoint is always the same. On models with display, the basic setpoint is set in the display. On all models, you can also configure the setpoints via a central system or Regio tool©. When the model has DIP switches, the latest setpoint change will be valid. Setpoint offset On all models, except RC-C3H and RC-CTH, the setpoint value can be adjusted up and down from the basic setpoint value, via the setpoint knob or the display. How much the value can be adjusted can be configured in Regio tool© or in the parameter menu in the display (FS= ± 3°C). In models with display, you use the INCREASE button to increase the current setpoint in steps of 0.5°C to the max. limit, and the DECREASE button to decrease the current setpoint in steps of 0.5°C to the min. limit. RC-C3H and RC-CTH have neither display nor setpoint knob. On these models, the setpoint is adjusted from the back of the electronics cassette with a small screwdriver. Calculation of the active setpoint What setpoint value the controller should control according to depends on the operating mode, the control mode and the current setpoint offset. Off In operating mode Off or on open window the controller is a heating controller, and controls according to the frost protection setpoint (FS=8°C), regardless of the setpoint adjustment. Unoccupied In operating mode Unoccupied, it controls according to the heating setpoint (FS=15°C) if a control mode with heating has been set and the room temperature is lower than this setpoint. If the room temperature is higher than the cooling setpoint (FS=30°C) and a control mode with cooling has been set, the unit is a cooling controller and controls according to the cooling setpoint. The active setpoint changes in the middle of the neutral zone with a hysteresis of 0.1°C. A setpoint adjustment is not active in this operating mode. Stand-by In operating mode Stand-by the controller controls according to the basic heating setpoint or the basic cooling setpoint plus/minus a settable neutral zone (FS=3°C). The setpoint can also be adjusted via the setpoint knob or display. This means that the factory setting for the heating setpoint is 19°C ± 3°C (local adjustment) and the cooling setpoint is 27°C ± 3°C (local adjustment). On heating demand the unit will control according to the heating setpoint, and on cooling demand it will control according to the cooling setpoint. The setpoint change takes place halfway between the setpoints with a hysteresis of 0.1°C. Occupied/Bypass In operating modes Occupied and Bypass the unit controls according to the basic heating setpoint or the basic cooling setpoint. The setpoint can also be adjusted via the setpoint knob or display. The setpoint change takes place halfway between the setpoints with a hysteresis of 0.1°C.

Regio Midi manual Setpoint display at setpoint adjustment Parameter 74 is used to set what is shown in the display when the setpoint is adjusted. 0 = The added adjustment is shown in the display. Example: +1.5°C. The adjustment is added to both the heating and cooling setpoints. 1 = The sum of the control setpoint and the adjustment is shown in the display. Example: The control setpoint is 22°C and the added adjustment is +1.5°C. This means that the value 23.5°C will be shown in the display. ”HEAT” or ”COOL” will flash depending on which of the setpoint values is the control setpoint when you enter the setpoint menu, i.e. depending on which setpoint you are changing. The adjustment is added to both the heating and cooling setpoints. 2 = The sum of the heating setpoint and the adjustment is shown in the display. The adjustment is added to both the heating and cooling setpoints. 3 = The sum of the cooling setpoint and the adjustment is shown in the display. The adjustment is added to both the heating and cooling setpoints.

Chapter 10 Actuators 49 Chapter 10 Actuators Regio can be used with four types of actuators: • Analogue 0…10 V actuators • Thermal actuators • 3-point actuators (Increase/Decrease actuators) • On/Off spring return actuators On units without display, it is possible to select if thermal or analogue actuators will be used via the DIP switches. For other actuators and Regio models, the actuator type is set via Regio tool© or, for controllers with a display, in the parameter menu. Analogue actuators The following output signals can be set for analogue actuators: • 0…10 V (FS) • 2…10 V • 10…2 V • 10…0 V Thermal actuators When thermal actuator control has been selected, it is controlled digitally with time proportional pulses via output UO1 and UO2. By pulsing, the opening degree of the actuator (and its valve) is varied. The period time (in seconds) is the sum of the on and off output times on the output. The period time is FS=60s. The controller varies the on and off output times proportionally depending on the output signal demand to the actuator. 3-point actuators For 3-point actuators (increase/decrease actuators, -T-models), two digital outputs are used for controlling one actuator, one output to open the actuator and one to close it. You can configure the run time (in seconds) for the different actuators (FS=120 s). The program calculates the position of the actuator (0…100 %) and sends an increase or decrease signal when the controller output signal deviates more than the set neutral zone (FS=2 %) from the calculated position. In order not to subject the actuator motor to unnecessary wear, it is possible to configure the outputs for 3-point actuators so that they will close after a control period of one minute plus run time, at either 0 % or 100 %. This takes place via Modbus (Coil status register 23) or using Regio tool©. On/Off actuators On/Off actuators can be used in control modes 0-8. Control mode: 0 = Heating 1 = Heating/Heating

Regio Midi manual 2= Heating or Cooling via change-over function 3 = Heating/Cooling 6 = Cooling 7 = Cooling / Cooling The actuators operate using a hysteresis (FS=2K), as depicted below. In control mode 1 and 7, the actuators are controlled in sequence. When in heating mode, the temperature is permitted to fall below the setpoint minus the hysteresis before opening the actuator. The actuator will then remain open until the temperature has reached the setpoint. In cooling mode, the opposite will occur. Actuator exercise All actuators are exercised. The exercise takes place at set intervals in hours (FS=23 hours interval). An opening signal is sent to the actuator for as long as the configured run time. Then a closing signal corresponding to the length of the run time is sent and the exercise is finished. On units with a display, the exercise can be inactivated by setting parameters 36 and 37 to zero (0).

Chapter 11 Fan control 51 Chapter 11 Fan control In controllers for fan control (…F-models) it is possible to control a fan at the following speeds: Off, Low speed, Medium speed, High speed, Auto. The fan speed in the Auto position depends on the controller output signal and the settings for each speed. Fan speed control Manual control The fan can be manually controlled to work at any speed. On models with display, you press the fan button once and a fan symbol is lit for 5 seconds in the display. As long as the symbol is lit, you can change the fan speed by repeatedly pressing the fan button. Models without display have a fan switch. Figure 15. Fan button on models with display Figure 16. Fan switch on models without display The controller has the following positions: Auto = Automatic control of the fan speed to maintain desired room temperature 0 = Manual off I = Manual position with low speed II = Manual position with medium speed III = Manual position with high speed Manual setting of speed I-III means that the speed of the fan in operating modes Stand-by, Occupied and Bypass is always the set speed. In the other operating modes, the fan is demand controlled. Auto control In auto mode, you can configure if the fan should be controlled by the heating output, the cooling output, or both the heating and cooling outputs. When the selected output exceeds the start value that has been set for each speed (FS speed 1=20 %, speed 2=60 %, speed 3=100 %), the fan is activated. It stops when the controller output signal drops below the set value minus the set hysteresis (FS=5 %). When the fan speed changes, there is always a minimum delay (2-3 s) between the inactivation of the output for the current speed and the activation of the output for the new speed. Only one fan speed output is defined at a time. Fan stopped In operating modes Off and Unoccupied, the fan is stopped, regardless of the position of the fan switch or the setting in the display, on condition that the temperature is within the set temperature limits. If the temperature is not within the set temperature limits, the fan will be started in the corresponding Auto position, regardless of the settings.

Regio Midi manual No fan stop Models RC-CF/CFO and CDFO contain an option in which the fan will never stop in operating modes Bypass, Occupied and Standby but instead continue to run at fan speed 1. This function uses parameter number 41. The factory setting for this option is 0, meaning that the function is disabled. This function will only work if the fan is in Auto mode; if the fan is set to manual mode, the manual setting will instead be applied. EC fan control Models RC-C3/C3H/C3O/C3DOC and C3DFOC offer an added function for the control of EC fans. When this function is active, Y3 will follow Y1 and Y2, respectively. As for …F models with fan control, it is possible to select whether the fan will run in Heating or Cooling, or in both Heating and Cooling. This setting is made using the same parameter (P50) as for other fan models. The function is activated by setting UO3 to Control of EC fan (P22). It may be activated in control modes Heating, Heating/Heating, Heating or Cooling via change-over, Heating/Heating or Cooling via change-over, Heating/Cooling, Cooling/Cooling and Cooling. The function will add a minimum limit to UO3, so that the fan will have sufficient supply voltage.

Chapter 11 Fan control 53 For model RC-C3DFOC, the fan button will control the EC fan output to pre-set speeds and then offer feedback to the user through the fan segment displayed. This takes place in the same way as for other …F models. When the fan button is pressed, it will step through the configured fan levels: NOTE: Regio tool© contains the text "Controller output for fan speed”. For an EC fan, this signifies the output level for fan speed 1, 2 and 3. When in auto mode, the output is fully step less. Prevent manual fan control This function prevents manual control of the fan when it is not desirable for it to be affected by the Cooling/Heating output signal. If the fan is not activated and set to follow the Cooling/Heating signal, it should not be possible to alter the fan speed manually. Please note that if the fan configuration is set to not follow the cooling or heating signal and this function is simultaneously active, the fan will not be controllable using the fan button. This function works as described below: Parameter 91 setting Is manual fan control available? If heating signal If cooling signal 0 = The fan is controlled neither by heating nor cooling demand No No 1 = The fan is controlled by heating demand Yes No 2 = The fan is controlled by cooling demand No Yes 3 = The fan is controlled by both cooling and heating demand Yes Yes If the controller has a fan button (only applies to models with a display), fan control will return to auto mode when the controller changes control mode from cooling to heating or vice versa. If the controller has a fan switch (only applies to models without a display), fan control will instead return to the current fan speed mode.

Regio Midi manual Fan boost function If there is a great difference between the room setpoint and current room temperature, or if one simply wishes to hear the fan start, a boost function can be activated to make the fan run at top speed for a set duration. An extra controller is then running in the background, using a P-band for fan control separate from that of the ordinary controller. The controller with the highest value will be outputted to the fan. The P-band is fixed and cannot be changed. When this function is active, the fan will initially run at full speed for 10 s and then decrease to the speed set by the extra controller for the remainder of the time set for the boost function. The boost function has a higher priority than the manually set fan speed. Fan kickstart When using today’s energy-saving EC fans, there is always a risk the fan will not start due to the low control voltage preventing the fan from exceeding its starting torque. The fan will then remain at a standstill while power still flows through it, which may give rise to damage. The kickstart function ensures fan output is set to 100 % for a set time (1...10 s) thereby making sure the starting torque is exceeded. Kickstart is activated when the lowest fan speed is selected. The function is also active during manual fan control. After the set time (1-10 s) has elapsed, the fan will return to its original speed.

Chapter 12 Special functions 55 Chapter 12 Special functions Change-over function Change-over is a function for installations with 2-pipe systems. It makes it possible to use the same pipe for both heating and cooling, depending on requirements during for example the summer (cooling output) and the winter (heating output). Control modes To activate the change-over function, control modes "Heating or Cooling via change-over" or "Heating/Heating or Cooling via change over" needs to be configured. All controllers in the Regio series have an input for change-over. To be able to configure the control mode "Heating/Heating or Cooling via change-over", it is necessary to have a Regio Midi controller with fan function. The input can be either of the type analogue PT1000-sensor or a closing contact connected to a digital input (FS=PT1000-input). Change-over digital When using a digital signal input (potential-free contact), closing the contact will activate the change-over function and set the heating output, UO1 alt. DO2/DO3 (-T-models), to cooling. On open contact, the change-over function will set the heating output to heating. Change-over analogue There are two different analogue change-over modes, simple and advanced. In both cases, a temperature sensor must be connected to an analogue input to measure the media temperature. Change-over simple In simple mode, the change-over state is set to cooling when the change-over temperature goes below the low limit. It is set to heating when the change-over temperature exceeds the high limit. Change-over advanced In advanced mode, the change-over function will measure the difference between the room and media temperature. As long as the heat valve is more than 20 % open, or every time a valve exercise is performed, the difference between the media and room temperature will be calculated. If the temperature difference is greater than the configured value (differs for Heating and Cooling mode), the control mode will change. The factory settings for the difference between Heating and Cooling change-over are: • Change from Heating to Cooling = 4K • Change from Cooling to Heating = 3K This setting may be changed using parameters number 9 and 10. Forced ventilation All Regio midi controllers have functionality for forced ventilation. All controllers except RC- C3DFOC have a digital output for controlling a forcing damper to increase the airflow to the room. This output is always activated in operating mode Bypass. When control mode “Heating/Cooling with VAV-control and forced supply air function” is active, the cooling output is used to control the forcing damper. When forced ventilation is active, the cooling output is set to full cooling, regardless of what the controller output signal is. Models RC-C3/RC-C3H/RC-C3O/RC-C3DOC/RCC-C3DOCS can select whether the forced ventilation output should be a 0…10 V analogue output or a 24 V digital output (parameter 22).

Regio Midi manual Condensation sensor Special input CI There is a special input (CI) on all Regio controllers. This input is intended for Regin’s condensation sensor, KG-A/1, and functions internally as a digital input, i. e. condensation or no condensation. When the condensation sensor is activated, the cooling control is blocked and the controller is set in neutral position. When condensation ceases, the controller will start controlling from the neutral position. Window contact When window contact has been configured, the controller is set to normal mode on closed window. On open window, the controller is set to off mode, the heating and cooling outputs are set to 0 V and the frost protection function is activated. Run indication, DI2 Digital input 2 (DI2) can be configured for run indication of e.g. an air handling unit. This indication can then be read in EXOline and Modbus. The change is made in parameter 18. Frost protection Regio has built-in frost protection, which is activated when the controller is not in use. The frost protection prevents the temperature from dropping below 8°C. Return to normal fan speed and control occurs automatically when the room temperature exceeds 8°C. High/low room temperature alarm High/low temperature alarm is a function to indicate if the room temperature is too high or too low. The high room temperature alarm will trigger when the room temperature exceeds the configured high temp limit (FS=40°C). The low room temperature alarm will trigger when the room temperature falls below the configured low temp limit (FS=15°C). The alarms are implemented as points that trigger when the temperature either exceeds or falls below the limits, and return as soon as the temperature returns. There is no advanced alarm handling, incorporating blocking or acknowledging or so forth. There is only an indication for faulty temperatures. All other alarm and alarm handling functions must be handled by a supervisory system. Lighting control UO3/DO4/DO1 can be used for lighting control. When UO3/UO4/DO1 is configured for lighting control, the following applies: Digital input 1 UO3/UO4/DO1 is activated when presence is detected via DI1. The output then remains active for as long as presence is detected. The Standby/Occupied/Bypass operating modes are active as usual. Off mode If the controller is in Off-mode (Off/Unoccupied), the occupancy input (DI1) will be active if UO3/DO4/DO1 is configured for lighting control. Occupancy button This button still controls On/Off and forced ventilation. If UO3/DO4/DO1 is configured for lighting control, the output will not be activated if a button is pressed.

Chapter 13 Indications 57 Chapter 13 Indications LED All controllers without a display, except RC-CH and RC-CTH, have a LED shaped like a thermometer on the front. A red indication is shown when heating control is functional and a blue indication is shown when cooling control is active. When there is something wrong with the controller or if a setting is incorrect, the LED will flash red and blue. Figure 17. The LED The occupancy button In models without a display, the occupancy button has the following indications: • Occupied: Fixed green indication • Standby: Flashing green indication • Bypass: Fixed green indication with a short flash • Off and Unoccupied: No indication For each of the above running modes, indications can be configured to behave in the following ways using Regio tool©: • Off = 0 • Flashing = 1 • Fixed light = 2 • Fixed with short flash = 3 Figure 18. The occupancy button On Regio models with a display, these indications are shown in the display. See the chapter Display handling. Communication LED When the frame has been removed, a LED is visible in the right edge of the controller. It lights up green when the controller is sending information.

Regio Midi manual Chapter 14 Display handling The Midi models RC-C3DO/RC-C3DFOC/RC-CDFO, RC-CDTO and RCC-C3DOCS have a display instead of a setpoint knob. These models also have an Occupancy button, as well as an INCREASE button and a DECREASE button to increase and decrease the setpoint. Figure 19. Buttons for display handling Display indications The display has the following indications (indications marked with an asterisk (*) are only available on -F-models): Figure 20. Indications in the display INCREASE button Occupancy button DECREASE button AUTO/MAN*: Auto/Man indication on the fan Occupancy indication Open window Fan* Setpoint Changeable value Forced ventilation COOL/HEAT: Shows if the unit controls according to the heating or cooling setpoint SERVICE: Is shown when parameters are set, flashes when there is something wrong with the controller Fan speed*: Current fan speed (0, 1, 2, 3) Current room temperature in °C to one decimal point OFF: Unoccupied (the temperature is shown) or Off- indication (only OFF is shown) STANDBY: Standby indication Indoor / outdoor temp.

Chapter 14 Display handling 59 Parameter menu It is possible to set different parameter values in a parameter menu. The parameter menu is accessed by simultaneously holding the INCREASE and DECREASE buttons pressed for about 5 seconds and then pressing the INCREASE button twice. The Service indication will be displayed. The display will initially show the parameter number “1”. Use the INCREASE and DECREASE buttons to scroll between parameters. Press the Occupancy button to select the desired parameter. The parameter number will be replaced by the parameter value. The value can be changed using the INCREASE and DECREASE buttons. If a button is held depressed the value will start scrolling, first slowly and then with increasing speed in 3 – 4 steps with 2 – 3 seconds between steps. Acknowledge/Regret To acknowledge and store a set parameter value, press the Occupancy button again, the display then returns to showing the parameter number. To retrieve the original value, i.e. the value before change, press the INCREASE and DECREASE buttons at the same time. The original value is shown on the display. Return After a certain time, about 1 minute, or when the INCREASE and DECREASE buttons are pressed at the same time while in the menu, the display returns to the normal view. Exit is shown on the display after the last parameter. The parameter menu is exited by pressing the Occupancy button while in Exit. Pressing on INCREASE goes to the first parameter and pressing on DECREASE goes to the last parameter. Blocking of buttons To prevent unauthorised users from accessing important functions, Regio controllers have a built-in function for blocking button access. As seen in the below tables, blocking may take place in different ways. The INCREASE/DECREASE buttons are always blocked/unblocked simultaneously. If the INCREASE/DECREASE buttons are blocked, the parameter menu can still be reached normally. Parameter 108 is used for configuration. For models without a fan button and configuration options 4-6, the function remains the same as for options 0-3. Configuration options Button function 0 No button is active 1 Only Occupancy button active 2 Only INCREASE/DECREASE buttons active 3 Occupancy and INCREASE/DECREASE buttons active 4 Only fan button active 5 Occupancy and fan buttons active 6 INCREASE/DECREASE and fan buttons active 7 All buttons active Configuration options Occupancy button active INCREASE/DECREASE buttons active Fan button active 0 1 X 2 X 3 X X 4 X 5 X X 6 X X 7 X X X

Regio Midi manual Configuration menu blocking This function prevents unauthorised access to the configuration menu using the buttons on the front of the device. When the function is active, all buttons will function normally except for the configuration menu no longer being accessible when INCREASE and DECREASE are pressed simultaneously. The function can be activated via the display, Regio tool© and Modbus. Please note that if the function is activated via the display, re-entering the parameter list via the display will be prevented. The function must then be deactivated using Regio tool©. Parameter list The following parameters can be changed in the parameter menu (FS = Factory setting): Parameter number Description FS 1 Basic heating setpoint 22°C 2 Basic cooling setpoint 24°C 3 Neutral zone at standby, Heating setpoint = Basic sp. heating-3 by default Cooling setpoint = Basic sp.cooling+3 by default 3°C 4 Heating setpoint at Unoccupied 15°C 5 Cooling setpoint at Unoccupied 30°C 6 Frost protection setpoint 8°C 7 P-band for room controller 10°C 8 I-time for room controller 300 s 9 The difference between the temperature in the room and the media temperature for change-over to cooling 3K 10 The difference between the temperature in the room and the media temperature for change-over to heating 4K 11 Control mode: 0=Heating 1= Heating / Heating 2= Heating or Cooling via change-over 3= Heating / Cooling 4= Heating / Cooling with VAV-control and forced ventilation 5= Heating / Cooling with VAV-control 6= Cooling 7= Cooling / Cooling 8= Heating / Cooling/VAV (C3-models, except RC-C3DFOC) 9=Heating / Heating or Cooling via change-over (only available on models with fan control) 10 = Change-over with VAV function 3 12 Time in Bypass mode 120 min 13 Disconnect timer with Occupancy/Unoccupancy 10 min 14 Switch-on delay for Occupancy 0 min 15 State connected sensor on AI1: 0=Internal sensor 1=External room sensor 2=Change-over sensor (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 3-10 = No function 11 = Supply air temperature limitation sensor 0 16 State connected sensor on UI1: (All models except RC-C3DOC, RCC-C3DOCS, RC-C3DFOC ) 0=None 1=Change-over digital 2=Change-over analogue 2 17 State connected sensor on DI1: 0=Not active 1=Window contact 2= No function 3= Presence detector 4=Change-over sensor (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC ) 5-6=No function 1

Chapter 14 Display handling 61 Parameter number Description FS 18 State connected sensor on DI2: 1=Window contact 2=Condensation sensor 3=No function 4=Change-over sensor (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC ) 5 = No function 6 = No function 7 = Run indication 2 20 State connected function on UO1: 0=None 1=Thermal actuator heat 2= None 3=Heating actuator 0...10 V 4= None 5=On/off actuator heat 6= None 3 21 State connected function on UO2: 0= None 1= None 2=Thermal actuator cool 3= None 4=Cooling actuator 0…10 V 5= None 6=On/off actuator cool 4 22 State connected function on UO3: 0= None 1=Forced vent. digital 2=Analogue output (OEM) 3 = Lighting control 4 = Analogue output 5=Control of EC fan (RC-C3-models) 1 24 Y3 output in manual mode (only if Y3 is configured as an analogue output; not available for RC-C3DFOC) 0 % 28 State output signal range for Y3-actuators: 0=0…10 V 1=2…10 V 2=10…2 V 3=10…0 V 0 29 State output signal range for heating actuators: 0=0…10 V 1=2…10 V 2=10…2 V 3=10…0 V 0 30 State output signal range for cooling actuators: 0=0…10 V 1=2…10 V 2=10…2 V 3=10…0 V 0 31 Period time for heating actuators with thermal actuator 60 s 32 Period time for cooling actuators with thermal actuator 60 s 33 Run time for heating actuators with increase/decrease actuators 120 s 34 Run time for cooling actuators with increase/decrease actuators 120 s 35 Neutral zone for increase/decrease actuators 2% 36 Time in hours between exercise of heating actuators 23h 37 Time in hours between exercise of cooling actuators 23h 38 Hysteresis for on/off actuators and heating 2K 39 Hysteresis for on/off actuators and cooling 2K 40 Minimum limit for the heat output 20 % 41 The fan will never stop 0=OFF 1=ON 0

Regio Midi manual Parameter number Description FS 42 Select if setpoint or actual value is to be shown in the display. 0=Actual value 1=Heat setpoint 2=Cool setpoint 3=Average value of heating and cooling setpoint 4=Only setpoint offset 5= CO2 concentration in the room in ppm (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 6=Heating setpoint +setpoint offset 7=cooling setpoint+setpoint offset 8=Average of heating and cooling setpoint+setpoint offset 9=The calculated flow in the duct in l/s (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 0 43 Highest permitted setpoint adjustment upwards 3°C 44 Highest permitted setpoint adjustment downwards 3°C 45 Pre-set operating mode: 0=Off 1=Unoccupied 2=Stand-by 3=Occupied. Forced ventilation is not set in Occupied mode. 3 46 State operating mode by pressing the occupancy button for 5 s: 0=Off 1=Unoccupied. 1 47 Select operating mode for central control: 0=Off 1=Unoccupied 2=Stand-by 3=Occupied 5=No central control 5 48 Min flow at cool output when control mode Heating/Cooling with VAV- control is selected Min flow at Y3 output when control mode Heating/Cooling/VAV is selected 20 % 49 Max flow on Y3 output when control mode Heating/Cooling/VAV is selected and in heating mode 0 % 50 Configuration of fan control: 0=No control 1=Fan is controlled by heating demand 2=Fan is controlled by cooling demand 3=Fan is controlled by both heating and cooling demand 3 51 Start signal in % for fan speed 1 on heating or cooling control 5% 52 Start signal in % for fan speed 2 60% 53 Start signal in % for fan spped 3 100% 54 Hysteresis for start/stop of fans 5% 55 State number of speeds for the fan (1, 2 or 3) 3 56 Temperature compensation on AI1 0°C 57 Temperature compensation on UI1 0°C 58 Temperature compensation on internal room sensor 0°C 59 Filter factor for analogue temperature inputs 0,2 60 State NO/NC digital input 1: 0=NO (Normally open) 1=NC (Normally closed) 0 61 State NO/NC digital input 2: 0=NO (Normally open) 1=NC (Normally closed) 1 62 State NO/NC universal input 1: 0=NO (Normally open) 1=NC (Normally closed) 0 63 Manual/Auto Heating output: 0=Off 1=Manual 2=Auto 2 64 Manual/Auto cooling output: 0=Off 1=Manual 2=Auto 2

Chapter 14 Display handling 63 Parameter number Description FS 65 Manual/Auto Y3 forced ventilation output: 0=Off 1=Manual 2=Auto For C3 models (except C3DFOC), manual mode means that Y3 puts out what is stated in parameter 24 if Y3 is configured as an analogue output. When Y3 is configured as a Digital output (including for C3 models) or does not exist, this parameter constitutes the Manual/Auto mode for the forced ventilation. 2 66 Manual/Auto control of change over mode: 0=Heat control 1=Cool control 2=Automatic change over depending on analogue sensor input or digital input 2 67 Heating output in manual mode 0 % 68 Cooling output in manual mode 0 % 69 Controller Modbus address Factory set 70 Parity bit Modbus communication: 0=No parity 1=Odd parity 2=Even parity 3 = No parity, 1 stop bit 2 71 Modbus time out for character (t1.5), in ms. Should be 1,5 times a character, i.e. at least 2 ms. 3 ms 72 Answer delay in Modbus (t3.5), in ms. Should be 3,5 times a character, i.e. at least 5 ms. 5 ms 73 Selection of heating output function (NO/NC): 0=NC (Normally closed) 1=NO (Normally opened) 0 74 Setpoint display at setpoint adjustment.: 0=The offset is shown in the display 1=The active setpoint + offset is shown in the display. Heat or Cool is shown depending on whether heat or cool is active when entering the menu 2=Heat setpoint + offset is shown in the display 3=Cooling setpoint + offset is shown in the display 0 75 Sequence order for Y2 and Y3: 0=Y2 activates before Y3 1=Y3 activates before Y2 0 76 Forced ventilation, control function: 0=Not active 1=Forced ventialtion at 100% output of heat or cool 2=Forced ventilation at 100% Cool output 0 77 Operating mode at presence detection: 3=Occupied 4=Bypass 4 78 EXOline PLA-address Factory set 79 EXOline ELA-address Factory set 80 Selection of cooling output functions (NO/NC): 0=NC 1=NO 0 81 State the connected sensor at AI2: (Only RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 0=None 1– 4=No function 5= CO2-sensor 6=No function 7=0…100% (OEM-function) 8=Flow calculation 9=0…10 V 5 82 Flow at 0 V input in AI2 0 l/s 83 Flow at 10 V input in AI2 100 l/s 84 Minimum runtime when calculating for change over 600s 86 Alarm limit for high room temperature 40°C 87 Alarm limit for low room temperature 15°C

Regio Midi manual Parameter number Description FS 91 Function to prevent user from setting manual fan speed if fan should not run due to cooling/heating output according to parameter 50. 0 = Not active 1 = Active 0 92 Fan boost function. Activation time: 0 = Not active 1-10 = The function is active for 10 s. 10-600 = Total activation time 0 93 Boost function, configuration: 0 = Heating mode only 1 = Cooling mode only 2 = Both heating and cooling mode 1 94 Fan kickstart. The fan will run 100 % when starting up for the set time. 0 = Not active 1-10 = Active for set time (seconds) 0 seconds 97 Activate presence if CO2 level is higher (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 800ppm 98 Deactivate presence if the CO2 level is lower than the limit minus this hysteresis (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 160ppm 100 Filter factor for CO2-input (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 0.2 101 Offset for internal CO2 sensor reading 0ppm 104 CO2-level at 0 V (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 0ppm 105 CO2-level at 10 V (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 2000ppm 108 Button function configuration: 0 = No button is active 1 = Only Occupancy button active 2 = Only INCREASE/DECREASE buttons active 3 = Occupancy and INCREASE/DECREASE buttons active 4 = Only fan button active 5 = Occupancy and fan buttons active 6 = INCREASE/DECREASE and fan buttons active 7 = All buttons active 7 109 Activate parameter menu access via display: 0 = Not active 1 = Active NOTE: Activating this function via the display will prevent re-entry! If so, parameter menu access may be activated again using Regio tool©. 0 110 Activate manual bypass timer setting. When the function is active, the user may step through bypass time in 1 hour increments. 0 = Not active 1 = Active 0 112 Min limit for VAV-damper at CO2-control (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 600ppm 113 Max limit for VAV-damper at CO2-control (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 800ppm 114 This parameter defines the protocol to be used: 0=EXOline/Modbus 1=BACnet MS/TP 0 115 BACnet MS/TP MAC address: 0-127=master address 128-254=slave address Factory set (00- 99) 116 Low 4 figures of the BACnet device ID. 0-9999 Factory set 117 High 3 figures of the device ID. Factory set 118 BACnet MS/TP Max master. 127 119 COMbus speed: 0=9600 1=19200 2=38400 3=76800 (only BACnet) 0 120 COMbus reset. When activated (1) it resets the communication to default settings 0 (deactivated) 121 Min limit for EC fan (%) 10 %

Chapter 14 Display handling 65 Parameter number Description FS 122 EC fan max limitation (V) 10 123 VAV-damper max limitation (%), control modes 5, 6 and 9 100 % 122 Max limit for EC fan (%) 100 % 125 Model Factory set (read only) 126 Version Major Factory set (read only) 127 Version Minor Factory set (read only) 128 Version Branch Factory set (read only) 129 Revision Factory set (read only) 132 Basic flow, Standby 10 % 133 Basic flow when no presence (Unoccupied) 10 % 134 Basic flow, Off 0 % 144 Period time for VAV-actuators with thermal actuators 60 s. 145 Select VAV-actuator function (NO/NC) 0 = NC (normally closed) 1 = NO (normally open) 0 146 Supply air max limitation for cascade control and heating control 35°C 147 Supply air min limitation for cascade control and heating control 24°C 148 Supply air max limitation for cascade control and cooling control 24°C 149 Supply air min limitation for cascade control and cooling control 12°C 150 Cascade factor between room controller and supply air controller 3°C 151 Frost protection temperature for supply air when supply air temperature limitation is active 8°C 152 Activate supply air temperature limitation for: 0 = Heating control 1 = Cooling control 2 = Both heating and cooling control 1 153 Select simple or advanced analog change-over function 0 = Simple 1 = Advanced 1 154 Use valve exercise 0 = Never 1 = Regularly 2 = Regularly and at power-up 3 = Regularly, at power-up and when changing state to Occupied 1 Table 15. Parameter list

Regio Midi manual Chapter 15 Memory function on power failure On power failure, settings and configurations are preserved in the controller in a so-called non- volatile memory (EEPROM). All changes made to the settings and configuration is saved in the memory, which means that the latest values are always stored. Measured values, as well as other variables that change often, are not stored. Values can be saved up to approximately 100 000 times in the non-volatile memory. Therefore, changed values should not systematically and very often be sent to the controller via network communication. Normal changes may still be sent via the network; for example if the operating mode is changed a few times per day. Disable autosave There is a function to disable the automatic saving to EEPROM. We recommend to use this function when huge amount of changes are sent to the unit via network communication. Save now to EEPROM This function saves all settings right now to the EEPROM. If autosave is disabled, it is highly recommended to save all settings to the EEPROM after configuring the unit for all settings to be kept after any type of power failure or restart of the unit. Example Activation of Bypass is not stored in the memory. Instead, the controller will return to the pre- set operating mode after power failure. However, the set operating mode will be saved if central control is being used (parameter 47).

Chapter 16 Modbus signal types 67 Chapter 16 Modbus signal types EXOL Types The EXOL types of the signals: R = Real (-3.3E38 - 3.3E38) I = Integer (-32768 - 32767) X = Index (0 - 255) L = Logic (0/1) Modbus Type The Modbus types of the signals (types in the list below): 1 = Coil Status Register (Modbus function = 1, 5 and 15) 2 = Discrete Input (Modbus function = 2) 3 = Holding Register (Modbus function = 3, 6 and 16) 4 = Input Register (Modbus function = 4) Supported Modbus functions: 1 = Read Coils 2 = Read Discrete Input 3 = Read Holding Register 4 = Read Input Register 5 = Write Single Coil 6 = Write Single Register 15 = Write Multiple Coils 16 = Write Multiple Registers Scale factor Modbus ”Discrete Inputs” and ”Coil status register” always have scale factor 1. For ”Input register” and ”Holding register”, see variable list in chapter ”Modbus signals”. EXOline/Modbus The Midi controller automatically switches between EXOline and Modbus depending on the present communication type, without any communication error. Modbus wiring etc. A protocol such as Modbus consists of several layers (OSI-model). The bottom layer is always the physical layer, number of wires and signal levels. The next layer describes the communication digits (number of data bits, stop-bits, parity etc). Then come the layers describing the Modbus specific functions (number of digits per message, the meaning of different messages etc). For Modbus, the bottom layer can be RS485, RS422 or RS232. RS485 contra RS422 RS485 and RS422 are the electric part of the protocol, i. e. the physical layer. RS485 has two connections, A and B. Often there is also a protective earth (N on EXO controllers). RS485 units are connected A  A and B  B. You may have to shift A and B in order for Modbus to work. RS485 is so called half duplex communication: Communication can only go in one direction at a time; i. e. the master will first send an enquiry and will thereafter listen for the reply. A and B are used for both transmission and reception.

Regio Midi manual RS422 is a full duplex communication which means you need 4 wires, 2 for transmit (Tx+ and Tx-) and 2 for receive (Rx+ and Rx-). Tx is used to transmit and Rx to receive, which means that Tx in one unit must be connected to Rx in the other and vice versa. As for signal levels, etc., RS422 and RS485 are identical. To interconnect RS485 and RS422: On the RS422 unit connect Tx+ with Rx+ and Tx- with Rx-. We have now changed a 4-wire system to a 2-wire system and can connect them to A and B on the RS485 unit. Which goes where is something you most often need to find out by trial and error. Incorrect polarity will just give nonfunction but cannot harm either unit. Tx+ -----|---------------------------------------- A (or B) | Rx+ -----| Tx- -----|---------------------------------------- B (or A) | Rx- -----| Bitrate, two stop bits, parity is the next layer These settings must correspond to the settings in the master unit. Find out how the master is set and then give the Controller the same settings. Parity can be set to odd, even (FS) or none. If none is chosen, two stop bits will automatically be used. It is also possible to configure no parity using one stop bit. In this case, automatic switching between EXOline and Modbus will not function. If odd or even is chosen, only one stop-bit is used, or there will be too many bits altogether: 1 start-bit, 8 data-bits, 1 parity-bit and 1 stop-bit give a total of 11 bits which is the maximum amount.

Chapter 17 Modbus signals 69 Chapter 17 Modbus signals Discrete inputs Signal name Type Modbus address Description RC_Actual_L.RegioDigIn(0) L,2 1 Not used RC_Actual_L.RegioDigIn1 L,2 2 Value of digital input 1 RC_Actual_L.RegioDigIn2 L,2 3 Value of digital input 2 RC_Actual_L.RegioUDigIn1 L,2 4 Value of universal digital input 1 RC_Actual_L.RegioDigOut(0) L,2 5 Not used RC_Actual_L.RegioDigOut1 L,2 6 Value of digital output 1 RC_Actual_L.RegioDigOut2 L,2 7 Value of digital output 2 RC_Actual_L.RegioDigOut3 L,2 8 Value of digital output 3 RC_Actual_L.RegioDigOut4 L,2 9 Value of digital output 4 RC_Actual_L.RegioDigOut5 L,2 10 Value of digital output 5 RC_Actual_L.RegioUDigOut1 L,2 11 Value of universal digital output 1 RC_Actual_L.RegioUDigOut2 L,2 12 Value of universal digital output 2 RC_Actual_L.RegioDIOpenWindow L,2 13 Indicate open window RC_Actual_L.RegioDICondenseAlarm L,2 14 Indicate condense alarm from digital input RC_Actual_L.RegioDIPresences L,2 15 Indicate presence from digital input RC_Actual_L.RegioDIChangeOver L,2 16 Indicate change over from digital input RC_Actual_L.RegioFanSpeed1 L,2 17 Indicate fan speed 1 RC_Actual_L.RegioFanSpeed2 L,2 18 Indicate fan speed 2 RC_Actual_L.RegioFanSpeed3 L,2 19 Indicate fan speed 3 RC_Actual_L.RegioForcedventilation L,2 20 Indicate forced ventilation RC_Actual_L.RegioCVHeatPulsProp L,2 21 Indicate pulse prop heating RC_Actual_L.RegioCVCoolPulsProp L,2 22 Indicate pulse prop cooling RC_Actual_L.RegioCVHeatInc L,2 23 Indicate increase heating RC_Actual_L.RegioCVHeatDec L,2 24 Indicate decrease heating RC_Actual_L.RegioCVCoolInc L,2 25 Indicate increase cooling RC_Actual_L.RegioCVCoolDec L,2 26 Indicate decrease cooling RC_Actual_L.RegioAIChangeOverState L,2 27 Indicate change-over state from analogue input RC_Actual_L.RegioChangeOverState L,2 28 Indicate change-over state from both digital and analogue input Not used in this model L,2 29 RC_Actual_L.RegioDigOut3 L,2 30 Value of universal digital output 3 RC_Actual_L.RegioPresence L,2 31 Indicate presence RC_Actual_L.RegioRoomTempHighTempAlarm L,2 32 Indicate high room temperature alarm RC_Actual_L.RegioRoomTempLowTempAlarm L,2 33 Indicate low room temperature alarm RC_Actual_L.RegioDICO2 L,2 34 Indicate high CO2 level

Regio Midi manual Signal name Type Modbus address Description RC_Actual_L.RegioLighting L,2 38 Lighting control, indication RC_Actual_L.RegioDIindacation L,2 39 Run indication, when DI2 is configured as such RC_Actual_L.RegioPresenceByCo2 L,2 40 Indicates presence from CO2 sensor Coil status register Signal name Type Modbus address Default value Description RC_Setp_L.RegioBypass L,1 1 0 Force the unit in Bypass mode. Is automatically returned after Bypass time. 0=No bypass 1=Bypass RC_Setp_L.RegioShutDown L,1 2 0 Force the unit in Shutdown state. 0=No Shutdown 1=Shutdown RC_Setp_L.RegioNotUsed L,1 3 Not used RC_Setp_L.RegioDiNC(0) L,1 4 Not used RC_Setp_L.RegioDi1NC L,1 5 0 State NO/NC digital input 1: 0=NO (Normally open) 1=NC (Normally closed) RC_Setp_L.RegioDi2NC L,1 6 1 State NO/NC digital input 2: 0=NO (Normally open) 1=NC (Normally closed) RC_Setp_L.RegioUDi1NC L,1 7 0 State NO/NC universal input 1: 0=NO (Normally open) 1=NC (Normally closed) RC_Setp_L.RegioCVHeatPulsPropNC L,1 8 0 Selection of heating output function (NO/NC): 0=NO (Normally open) 1=NC (Normally closed) Not used in this model L,1 9-13 0 RC_Setp_L.RegioMinFanSpeed L,1 14 0 The fan will never stop: 0=Off 1=On RC_Setp_L.RegioCVCoolPulsPropNC L,1 15 0 Selection of cooling output functions (NO/NC): 0=NO (Normally open) 1=NC (Normally closed) RC_Setp_L.RegioComFactoryDefault L,1 16 0 Resets communication to default values: 1=Reset (returns to 0) RC_Setp_L.RegioBlockConfig L,1 21 0 Prevents parameter menu access via display

Chapter 17 Modbus signals 71 Signal name Type Modbus address Default value Description RC_Setp_L.RegioPreventManualFanS peed L,1 22 0 Function to prevent user from setting manual fan speed if fan should not run due to cooling/heating output according to parameter 50. 0 = Not active 1 = Active RC_Setp_L.Regio3PEndlimProtect L,1 23 0 Shuts down the three-position actuator output after 1 minute at 0 % or 100 % output RC_Setp_L.RegioSteppableBPTimer L,1 24 0 Activate manual bypass timer setting. When the function is active, the user may step through bypass time in 1 hour increments. 0 = Not active 1 = Active RC_Setp_L.RegioChangeOverAdvanc ed L,1 25 1 Select simple or advanced analog change-over RC_Setp_L.RegioDisableAutoSave L,1 26 0 Disables automatic saving to EEPROM RC_Setp_L.RegioSaveNow L,1 27 0 Save current settings to EEPROM now Input register Signal name Type Modbus address Scale factor Description RC_Actual_X.RegioSoftware X, 4 1 - Model RC_Actual_X.RegioVerMajor X, 4 2 - Version Major RC_Actual_X.RegioVerMinor X, 4 3 - Version Minor RC_Actual_X.RegioVerBranch X, 4 4 - Version Branch RC_Actual_X.RegioRevision X, 4 5 - Revision RC_Actual_X.RegioFanSwitch X, 4 6 - Indicates the position of the fan switch: 0=Fan switched off 1=Fan speed 1 2=Fan speed 2 3=Fan speed 3 4=Auto RC_Actual_X.RegioUnitState X, 4 7 - Indicate current unit state: 0=Off 1=Unoccupied 2=Stand-by 3=Occupied 4=Bypass RC_Actual_X.RegioControllerState X, 4 8 - Indicate current controller state: 0=Off 1=Heating 2=Cooling

Regio Midi manual Signal name Type Modbus address Scale factor Description RC_Actual_X.RegioFanSpeed X, 4 9 - Indicate current fan speed: 0=Off 1=Fan speed 1 is on 2=Fan speed 2 is on 3=Fan speed 3 is on RC_Actual_R.RegioNotUsedX X, 4 10 - Not used RC_Actual_R.RegioRoomTemp R, 4 11 10 Room temperature RC_Actual_R.RegioRoomTempExt R, 4 12 10 Room temperature from external sensor RC_Actual_R.RegioRoomTempInt R, 4 13 10 Room temperature from internal sensor RC_Actual_R.RegioAIChangeOver R, 4 14 10 Change-over temperature RC_Actual_R.RegioAnaIn1 R, 4 15 10 Value of analogue input 1 RC_Actual_R.RegioUAnaIn1 R, 4 16 1 Value of universal analogue input 1 RC_Actual_R.RegioUAnaOut1 R, 4 17 - Value of universal analogue output 1 RC_Actual_R.RegioUAnaOut2 R, 4 18 - Value of universal analogue output 2 RC_Actual_R.RegioSetPAdjustment R, 4 19 10 Setpoint adjustment from internal device RC_Actual_R.RegioPIDSetP R, 4 20 10 The controller setpoint RC_Actual_R.RegioPIDOutput R, 4 21 - The controller output (0…100 %) RC_Actual_R.RegioHeatOutput R, 4 22 - Heat output (0…100 %) RC_Actual_R.RegioCoolOutput R, 4 23 - Cool output (0…100 %) RC_Actual_R.RegioAI1Raw R, 4 24 10 The raw value on analogue input 1 RC_Actual_R.RegioUI1Raw R, 4 25 1 The raw value on universal input 1 RC_Actual_R.RegioUO3Output R, 4 26 10 Value of universal output 3 RC_Actual_R.RegioUAnaOut3 R, 4 27 10 Value of universal analogue output 3 RC_Actual_R.RegioRoomCO2 R, 4 32 - CO2 input value (ppm) Not used in this model R, 4 44 - RC_Actual_R.RegioVoltInput R, 4 45 10 Value of 0…10 V DC input at AI2 RC_Actual_R.RegioRoomFlow R, 4 46 10 Value of Room Air Flow at AI2 RC_Actual_R.RegioSupplyAirTemp R, 4 47 10 Supply air temperature from sensor connected to A1 RC_Actual_R.RegioSupplyAirPIDo ut R, 4 48 - Supply air controller output RC_Actual_R.RegioPID2Setp R, 4 49 10 Room controller output (scaled) and supply air controller setpoint Holding register Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.AlaModStat X, 3 1 - - Not used RC_SetP_X.RegioFreeCoolAvailable X, 3 2 0 - Sequence order for Y2 and Y3: 0=Y2 activates before Y3 1=Y3 activates before Y2

Chapter 17 Modbus signals 73 Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.RegioHeatOutputSelect X, 3 3 2 - Manual/Auto Heating output: 0=Off 1=Manual 2=Auto RC_Setp_X.RegioCoolOutputSelect X, 3 4 2 - Manual/Auto Cooling output: 0=Off 1=Manual 2=Auto RC_Setp_X.RegioFanSelect X, 3 5 4 - Select fan mode: 0 = Off 1 = Manual speed 1 2 = Manual speed 2 3 = Manual speed 3 4 = Auto RC_Setp_X. RegioFanControlMode X, 3 6 3 - Configuration of fan control: 0=No control 1=Fan is controlled by heating demand 2=Fan is controlled by cooling demand 3=Fan is controlled by both heating and cooling demand RC_Setp_X.RegioFanSpeed1Start X, 3 7 5 % - Start signal in % for fan speed 1 on heating or cooling control RC_Setp_X.RegioFanSpeed2Start X, 3 8 60 % - Start signal in % for fan speed 2 RC_Setp_X.RegioFanSpeed3Start X, 3 9 100 % - Start signal in % for fan speed 3 RC_Setp_X.RegioFanSpeedHyst X, 3 10 5 % - Hysteresis for start/stop of fans RC_Setp_X.RegioFanSpeedMax X, 3 11 3 - State number of speeds for the fan RC_Setp_X.RegioForcedVentSelec X, 3 12 2 - Manual/Auto Y3 forced ventilation output: 0=Off 1=Manual 2=Auto RC_Setp_X.RegioChangeOverSelect X, 3 13 2 - Manual/Auto control of change-over mode: 0=Heat control 1=Cool control 2=Automatic change over depending on analogue sensor input or digital input RC_Setp_X.RegioRemoteState X, 3 14 5 - Select operating mode for central control: 0=Off 1=Unoccupied 2=Stand-by 3=Occupied 5=No central control

Regio Midi manual Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.RegioUnitReturnState X, 3 15 3 - Pre-set operating mode: 0=Off 1=Unoccupied 2=Stand-by 3=Occupied. Forced ventilation is not set in Occupied mode. RC_Setp_X.RegioUnitShutDownState X, 3 16 1 - State operating mode by pressing the occupancy button for 5 s: 0=Off 1=Unoccupied. RC_Setp_X.RegioBtnOnOffTime X, 3 17 5 s (0 s for F- models) - Time to keep the occupancy button depressed before switching to Shutdown state. RC_Setp_X.RegioControllerMode X, 3 18 3 - Control mode: 0=Heating 1= Heating / Heating 2= Heating or Cooling via change over 3= Heating /Cooling 4= Heating /Cooling with VAV-control and forced supply air function 5= Heating /Cooling with VAV-control 6= Cooling 7= Cooling/Cooling 8= Heating /Cooling/VAV (C3-models, except RC- C3DFOC) 9=Heating/Heating or Cooling via change-over (only available in models with fan control) 10= Change-over with VAV- function RC_Setp_X.RegioCVHeatType X, 3 19 0 - State output signal range for Heating-actuators: 0=0…10 V 1=2…10 V 2=10…2 V 3=10…0 V RC_Setp_X.RegioCVCoolType X, 3 20 0 - State output signal range for Cooling actuators: 0=0…10 V 1=2…10 V 2=10…2 V 3=10…0 V RC_Setp_X.RegioCVHeatExerciseInter val X, 3 21 23h - Time in hours between exercise of heating actuators RC_Setp_X.RegioCVCoolExerciseInter val X, 3 22 23h - Time in hours between exercise of cooling actuators Not used in this model X, 3 23 - -

Chapter 17 Modbus signals 75 Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.RegioAi1 X, 3 24 0 - State connected sensor on AI1: 0=Internal sensor 1=External room sensor 2=Change over sensor (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 3-10= No function 11= Supply air temperature limitation sensor RC_Setp_X.RegioAi2 X, 3 25 5 - State the connected sensor at AI2: (Only RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 0=None 1– 4=No function 5=CO2-sensor 6=No function 7=0…100 % (OEM-function) 8=Flow calculation 9=0…10 V Not used in this model X, 3 26 - - RC_Setp_X.RegioDi1 X, 3 27 3 - State connected sensor on DI1: 0=Not active 1=Window contact 2= No function 3=Presence detector 4=Change over sensor (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_Setp_X.RegioDi2 X, 3 28 2 - State connected sensor on DI2: 1=Window contact 2=Condensation sensor 3=No function 4=Change over sensor (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 3-10= No function 11= Supply air temperature limitation sensor Not used in this model X, 3 29 0 - RC_Setp_X.RegioUi1 X, 3 30 2 - State connected sensor on UI1: (All models except RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 0=None 1=Change-over digital 2=Change-over analogue Not used in this model X, 3 31-34 - -

Regio Midi manual Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.RegioDo1 X, 3 35 1 (-F- models), 4 (other models) - 0=Not active 1=Fan speed 1 2=Fan speed 2 3=Fan speed 3 4=Forced ventilation 5=Thermal actuator heating 6=Thermal actuator cooling 7=Increase/Decrease valve, heating increase 8=Increase/Decrease valve, heating decrease 9=Increase/Decrease valve, cooling increase 10= Increase/Decrease valve, cooling decrease 11=Lighting control RC_Setp_X.RegioDo2 (only used for -F- and -T- models) X, 3 36 2 (-F- models), 7 (-T- models) - 2=Fan speed 2 7= Heat valve increase RC_Setp_X.RegioDo3 (only used for -F- and -T- models) X, 3 37 3 (-F- models), 8 (-T- models) - 3=Fan speed 3 8=Heat valve decrease RC_Setp_X.RegioDo4 (only used for -F- and -T- models) X, 3 38 4 (-F- models), 9 (-T- models) - 4=Forced ventilation 9= Cool valve increase RC_Setp_X.RegioDo5 (only used for -T- models) X, 3 39 10 (-T- models) - 10=Cool valve decrease Not used in this model X, 3 40-41 - - RC_Setp_X.RegioUo1 (Not –T- models) X, 3 42 3 - State connected function on UO1: 0=None 1=Thermal actuator heat 2=None 3=Heating actuator 0...10 V 4=None 5=On/off actuator heat 6=None RC_Setp_X.RegioUo2 (Not –T- models) X, 3 43 4 - State connected function on UO2: 0=None 1=None 2=Thermal actuator Cool 3=None 4=Cooling actuator 0…10 V 5=None 6=On/off actuator cool RC_Setp_X.RegioModbusSlaveAddr X, 3 44 Factory set - Controller Modbus address

Chapter 17 Modbus signals 77 Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.RegioModbusParity X, 3 45 2 - Parity of Modbus communication: 0=No parity 1=Odd parity 2=Even parity 3=No parity, 1 stop bit RC_Setp_X.RegioModbusCharTimeout X, 3 46 3 ms - Modbus timeout for character (t1.5), in ms. Should be 1.5 times a character, i.e. at least 2 ms. RC_Setp_X.RegioModbusAnswerDelay X, 3 47 5 ms - Answer delay in Modbus (t3.5), in ms. Should be 3.5 times a character, i.e. at least 5 ms. RC_Setp_X.RegioDispBacklightLO X, 3 48 10 - 10=Backlight low RC_Setp_X.RegioDispBacklightHi X, 3 49 30 - 30=Backlight high RC_Setp_X.RegioDispContrast X, 3 50 15 - 15=Display contrast RC_Setp_X.RegioDisplayViewMode X, 3 51 0 - Select if setpoint or actual value is to be shown in the display. 0=Actual value 1=Heat setpoint 2=Cool setpoint 3=Average value of heating and cooling setpoint 4=Only setpoint offset 5=CO2-concentration in the room in ppm (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) 6=Heating setpoint +setpoint offset 7=Cooling setpoint+setpoint offset 8=Average of heating and cooling setpoint+setpoint offset 9=The calculated flow in the duct in l/s (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC )

Regio Midi manual Signal name Type Modbus address Default value Scale factor Description RC_Setp_X.RegioDispSetpMode X, 3 52 0 - Setpoint display at setpoint adjustment: 0=The offset is shown in the display 1=The active setpoint + offset is shown in the display. Heat or Cool is shown depending on whether heat or cool is active when entering the menu 2=Heat setpoint + offset is shown in the display 3=Cooling setpoint + offset is shown in the display 4=Heating occupied setpoint + offset is shown in the display 5=Cooling occupied setpoint + offset is shown in the display 6=Average of heating and cooling setpoints + offset is shown in the display RC_Setp_X.RegioUo3 X, 3 53 6 (RC- C3DFO C) or 1 (other C3… models) - State connected function on UO3: 0=None 1=Forced ventilation, digital 2=Analogue output (OEM) 3=Lighting control, digital 4=Ordinary analogue output 5=None 6=Control of a EC fan (RC- C3 and RCC-… models) RC_Setp_X.RegioForcedVentControlM ode X, 3 54 0 - Forced ventilation, control function: 0=Not active 1=Forced ventilation at 100 % output of heat or cool 2=Forced ventilation at 100 % cool output RC_Setp_X.RegioUnitDIPresenceState I, 3 55 4 - Operating mode at presence detection: 3=Occupied 4=Bypass RC_Setp_I.RegioBypassTime I, 3 56 120 min - Time in Bypass mode RC_Setp_I.RegioPresenceOffTime I, 3 57 10 min - Disconnect timer with Occupancy/Unoccupancy RC_Setp_I.RegioPresenceOnTime I, 3 58 0 min - Switch-on delay for Occupancy RC_Setp_I.RegioCVHeatPeriodTime I, 3 59 60s - Period time for heating actuators with thermal actuator RC_Setp_I.RegioCVCoolPeriodTime I, 3 60 60s - Period time for cooling actuators with thermal actuator

Chapter 17 Modbus signals 79 Signal name Type Modbus address Default value Scale factor Description RC_Setp_I.RegioCVHeatRunTime I, 3 61 120 s - Run time for heating actuators with increase/decrease actuators RC_Setp_I.RegioCVCoolRunTim I, 3 62 120 s - Run time for cooling actuators with increase/decrease actuators Not used in this model X, 3 63-67 - - RC_Setp_R.RegioOccSetPHeat R, 3 68 22°C 10 Basic Heating setpoint RC_Setp_R.RegioOccSetPCool R, 3 69 24°C 10 Basic Cooling setpoint RC_Setp_R.RegioStandbySetPDeadBan d R, 3 70 3°C 10 Neutral zone at Stand-by, Heating sp=basic sp .heating- 3 by default, Coolsp=Basic sp.cool+3 by default RC_Setp_R.RegioUnOccSetPHeat R, 3 71 15°C 10 Heating setpoint at Unoccupied RC_Setp_R.RegioUnOccSetPCool R, 3 72 30°C 10 Cooling setpoint at Unoccupied RC_Setp_R.RegioFrostSetP R, 3 73 8°C 10 Frost protection setpoint RC_Setp_R.RegioSetpointOffsetPos R, 3 74 3°C 10 Highest permitted setpoint adjustment uppwards RC_Setp_R.RegioSetpointOffsetNeg R, 3 75 3°C 10 Highest permitted setpoint adjustment downwards RC_Setp_R.RegioSetPOffset R, 3 76 0 °C 10 The setpoint adjustment RC_Setp_R.RegioPIDPGain R, 3 77 10°C 10 P-band for room controller RC_Setp_R.RegioPIDITime R, 3 78 300 s I-time (s) for room controller RC_Setp_R.RegioCVDeadband R, 3 79 2% Deadband for increase/decrease actuators (%) RC_Setp_R.RegioAIChangeOverDiffHe at R, 3 80 3K 10 The difference between the temperature in the room and the media temperature for change over to cooling RC_Setp_R.RegioAIChangeOverDiffCo ol R, 3 81 4K 10 The difference between the temperature in the room and the media temperature for change over to heating RC_Setp_R.RegioAi1Comp R, 3 82 0°C 10 Temperature compensation on AI1 RC_Setp_R. RegioUi1Comp R, 3 83 0°C 10 Temperature compensation on UI1 RC_Setp_R.RegioInternalTempComp R, 3 84 0°C 10 Temperature compensation on internal room sensor RC_Setp_R.RegioTempFilterFactor R, 3 85 0,2 10 Filter factor for analogue temperature inputs

Regio Midi manual Signal name Type Modbus address Default value Scale factor Description RC_Setp_R.RegioMinFlow R, 3 86 20 - Min flow at cool output when control mode Heating/Cooling with VAV- control is selected Min flow at Y3 output when control mode Heating/Cooling/VAV is selected RC_Setp_R.RegioMaxFlowHeat R, 3 87 0% - Max flow on cool output when control mode Heating/Cooling with VAV- control is selected and heating is applied. RC_SetP_R.RegioRoomTempHighLimi t R, 3 88 40°C 10 Alarm limit for high room temperature RC_SetP_R.RegioRoomTempLowLimit R, 3 89 15°C 10 Alarm limit for low room temperature RC_Setp_R.RegioVAVMaxHeatCool R, 3 90 100 % - VAV-damper max limitation. Applies to control modes 4, 5 and 8. Not used in this model R, 3 90-92 - - RC_Setp_R.RegioUo3OutputManual R, 3 93 0% - Y3 Output in manual mode RC_Setp_R.RegioHeatOutputManual R, 3 94 0% - Heating output in manual mode RC_Setp_R.RegioCoolOutputManual R, 3 95 0% - Cooling output in manual mode RC_Setp_R.RegioRoomTempRemote R, 3 96 -255 10 Room temp set by remote control if external room sensor is configured (-255 = disabled) RC_Setp_R.RegioCO2_0V R, 3 120 0ppm - CO2-level at 0 V (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_Setp_R.RegioCO2_10V R, 3 121 2000pp m - CO2-level at 10 V (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_Setp_R.RegioCO2FilterFactor R, 3 125 0,2 10 Filter factor for CO2-input (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_Setp_R.RegioCO2PresenceLimit R, 3 133 800ppm - Activate presence if CO2 level is higher (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_Setp_R.RegioCO2PresenceHyst R, 3 134 160ppm - Deactivate presence if the CO2 level is lower than the limit minus this hysteresis (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC)

Chapter 17 Modbus signals 81 Signal name Type Modbus address Default value Scale factor Description RC_Setp_R.RegioCO2LimitLow R, 3 147 600ppm - Min limit for VAV-damper at CO2-control (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_Setp_R.RegioCO2LimitHigh R, 3 148 800ppm - Max limit for VAV-damper at CO2-control (RC-C3DOC, RCC-C3DOCS, RC-C3DFOC) RC_SetpExt_R.RegioFlowFilterFactor R, 3 149 0 10 Flow filter factor RC_Setp_R.RegioFanBoostTime R, 3 276 0 - Fan boost function. Activation time: 0= Not active 1-10 = The function is active for 10 s. 10-600 = Total activation time RC_SetpExt_R.RegioFlow_0V R, 3 277 0 l/s - Flow at 0 V input in AI2 (l/s) RC_SetpExt_R.RegioFlow_10V R, 3 278 100 l/s - Flow at 10 V input in AI2 (l/s) RC_SetpExt_R.RegioThermostatHystH eat R, 3 279 2K 10 Hysteresis for On/Off actuators and heating RC_SetpExt_R.RegioThermostatHystC ool R, 3 280 2K 10 Hysteresis for on/off actuators and cooling RC_SetpExt_R.RegioMinHeat R, 3 281 0 % - Min. limit for the heat output RC_SetpExt_R.RegioMinECFanSpeed R, 3 282 10 % - Min. limit for EC fan (%) RC_SetpExt_R.RegioMaxECFanSpeed R, 3 283 100 % - Max. limit for EC fan (%) RCPSettings.RegioMinFlowStandby R, 3 285 10 % - Basic flow at “Standby” when control state “Heating/Cooling with VAV- control” or “Heating/Cooling/VAV” is configured RCPSettings.RegioMinFlowUnoccupied R, 3 286 10 % - Basic flow at “Unoccupied” when control state “Heating/Cooling with VAV- control” or “Heating/Cooling/VAV” is configured RCPSettings.RegioMinFlowOff R, 3 287 0 % - Basic flow at “Off” when control state “Heating/Cooling with VAV- control” or “Heating/Cooling/VAV” is configured RC_Setp_R.SupplyAirTLim_HeatHi R, 3 289 35°C 10 Supply air max limitation for cascade control and heating control

Regio Midi manual Signal name Type Modbus address Default value Scale factor Description RC_Setp_R.SupplyAirTLim_HeatLo R, 3 290 24°C 10 Supply air min limitation for cascade control and heating control RC_Setp_R.SupplyAirTLim_CoolHi R, 3 291 24°C 10 Supply air max limitation for cascade control and cooling control RC_Setp_R.SupplyAirTLim_CoolLo R, 3 292 12°C 10 Supply air min limitation for cascade control and cooling control RC_Setp_R.SupplyAirTLim_CascadeFa ct R, 3 293 3°C 10 Cascade factor between room controller and supply air controller RC_Setp_R.SupplyAirTLim_FrostProte ct R, 3 294 8°C 10 Frost protection temperature for supply air when supply air temperature limitation is active RC_Setp_X.RegioExerciseSelect X, 3 296 1 - Use valve exercise 0 = Never 1 = Regularly 2 = Regularly and at power- up 3 = Regularly, at power-up and when changing state to Occupied

Chapter 18 BACnet signal types 83 Chapter 18 BACnet signal types BACnet Bacnet communication is only available in models with display. In order to communicate via BACnet, the protocol has to be changed either via Regio tool© or via the parameter list in the display. Once the protocol has been set to BACnet it can only be switched back to EXOline and Modbus via the display. MS/TP mode Both MS/TP master and slave are supported. The mode is controlled by setting the MAC address. If < 127, master mode is selected. A MAC address of > 127 enables slave. Object Type The BACnet types of the signals (types in the list below): • Analogue inputs • Analogue values • Binary inputs • Binary values • Loop • Multistate inputs • Multistate values • Device Out_of_service The property out_of_service is not writable for all Object Types. Commandable The value objects are not commandable (i.e. does not use a priority array).

Regio Midi manual Chapter 19 BACnet signals Analogue inputs Object name Object-ID Description Unit Writable RC_Actual_R.RegioRoomTemp Analog input, 0 Room temperature °C No RC_Actual_R.RegioAIChangeOver Analog input, 1 Change over temperature °C No RC_Actual_R.RegioAnaIn1 Analog input, 2 Value of analogue input 1 °C No RC_Actual_R.RegioUAnaIn1 Analog input, 3 Value of universal analogue input 1 V No RC_Actual_R.RegioRoomCO2 Analog input, 4 CO2 input value ppm No RC_Actual_R.RegioSupplyAirTemp Analog input, 5 Supply air temperature °C No RC_Actual_R.RoomFlow Analog input, 6 Air flow l/s No RC_Actual_R.VoltInput Analog input, 7 Value on analogue input 2 V No Analogue values Object name Object-ID Description Unit Writable RC_Actual_R.RegioUAnaOut1 Analog value, 0 Value of universal analogue output 1 V No RC_Actual_R.RegioUAnaOut2 Analog value, 1 Value of universal analogue output 2 V No RC_Actual_R.RegioSetPAdjustment Analog value, 2 Setpoint adjustment from internal device °C No RC_Actual_R.RegioPIDSetP Analog value, 3 Controller setpoint °C No RC_Actual_R.RegioPIDOutput Analog value, 4 Controller output % No RC_Actual_R.RegioHeatOutput Analog value, 5 Heat output % No RC_Actual_R.RegioCoolOutput Analog value, 6 Cool output % No RC_Setp_R.RegioOccSetPHeat Analog value, 7 Room base setpoint heating °C Yes RC_Setp_R.RegioOccSetPCool Analog value, 8 Room base setpoint cooling °C Yes RC_Setp_R.RegioUnOccSetPHeat Analog value, 9 Room heat setpoint in unoccupied mode °C Yes RC_Setp_R.RegioUnOccSetPCool Analog value, 10 Room cool setpoint in unoccupied mode °C Yes RC_Setp_R.RegioFrostSetP Analog value, 11 Frost protection setpoint °C Yes

Chapter 19 BACnet signals 85 Object name Object-ID Description Unit Writable RC_Setp_R.RegioSetPOffset Analog value, 12 Setpoint adjustment °C Yes RC_Setp_R.RegioHeatOutputManual Analog value, 13 Manual value heating output % Yes RC_Setp_R.RegioCoolOutputManual Analog value, 14 Manual value cooling output % Yes RC_Setp_R.RegioRoomTempRemote Analog value, 15 Remote control of room temperature °C Yes RC_Setp_R.RegioStandbySetPDeadBand Analog value, 16 Deadband in Standby mode °C Yes RC_Setp_R.RegioCVDeadband Analog value, 17 Deadband control valve % Yes RC_Setp_R.RegioAIChangeOverDiffHeat Analog value, 18 Difference between media temperature and room temperature to switch to heating control K Yes RC_Setp_R.RegioAIChangeOverDiffCool Analog value, 19 Difference between media temperature and room temperature to switch to cooling control K Yes RC_Setp_R.RegioRoomTempHighLimit Analog value, 20 Alarm limit for high room temperature °C Yes RC_Setp_R.RegioRoomTempLowLimit Analog value, 21 Alarm limit for low room temperature °C Yes RC_Setp_R.RegioFlow_0V Analog value, 22 Flow at 0 V input signal at AI2 l/s Yes RC_Setp_R.RegioFlow_10V Analog value, 23 Flow at 0 V input signal at AI2 l/s Yes RC_Setp_R.RegioThermostatHystHeat Analog value, 24 Hysteresis when On/Off control and Heat control K Yes RC_Setp_R.RegioThermostatHystCool Analog value, 25 Hysteresis when On/Off control and Cool control K Yes RC_Setp_R.RegioMinHeat Analog value, 26 Minimum heat output at Heat control % Yes RC_Setp_R.RegioMinECFanSpeed Analog value, 27 Minimum speed for the EC fan % Yes RC_Setp_R.RegioMaxECFanSpeed Analog value, 28 Maximum speed for the EC fan % Yes RC_Setp_R.RegioAnaOut3 Analog value, 29 Value on universal analogue output 3 V No RC_Setp_R.RegioUO3Output Analog value, 30 UO3 Output (0…100 %) % No RC_Actual_R.RegioPID2Setp Analog value, 31 Calculated supply air setpoint °C No No function Analog value, 32-34 RC_SetpExt_R.RegioCO2LimitLow Analog value, 35 CO2 value when damper starts to open ppm Yes RC_SetpExt_R.RegioCO2LimitHigh Analog value, 36 CO2 value when damper is fully open ppm Yes

Regio Midi manual Binary inputs Object name Object-ID Description Values Writable RC_Actual_L.RegioDIOpenWindow Binary input, 0 Indicate open window ACTIVE/ INACTIVE No RC_Actual_L.RegioDICondenseAlarm Binary input, 1 Indicate condense alarm from digital input YES/ NO No RC_Actual_L.RegioDIPresences Binary input, 2 Indicate presence from digital input ACTIVE/ INACTIVE No RC_Actual_L.RegioDIChangeOver Binary input, 3 Indicate change over from digital input ACTIVE/ INACTIVE No RC_Actual_L.RegioRoomTempHighTempAlarm Binary input, 4 Room high temperature alarm ACTIVE/ INACTIVE No RC_Actual_L.RegioRoomTempLowTempAlarm Binary input, 5 Room low temperature alarm ACTIVE/ INACTIVE No RC_Actual_L.RegioDICO2 Binary input, 6 Indicates high CO2 level ACTIVE/ INACTIVE No RC_Actual_L.RegioDIindacation Binary input, 7 Run indication, when DI2 is configured as such ACTIVE/ INACTIVE No All binary inputs have normal polarity. Binary values Object name Object-ID Description Values Writable RC_Actual_L.RegioForcedVentilation Binary value, 0 Indicate forced ventilation ON/OFF No RC_Actual_L.RegioCVHeatPulsProp Binary value, 1 Indicate pulse prop heating ACTIVE/ INACTIVE No RC_Actual_L.RegioCVCoolPulsProp Binary value, 2 Indicate pulse prop cooling ACTIVE/ INACTIVE No RC_Actual_L.RegioCVHeatInc Binary value, 3 Indicate increase heating ACTIVE/ INACTIVE No RC_Actual_L.RegioCVHeatDec Binary value, 4 Indicate decrease heating ACTIVE/ INACTIVE No RC_Actual_L.RegioCVCoolInc Binary value, 5 Indicate increase cooling ACTIVE/ INACTIVE No RC_Actual_L.RegioCVCoolDec Binary value, 6 Indicate decrease cooling ACTIVE/ INACTIVE No RC_Actual_L.RegioChangeOverState Binary value, 7 Indicate change over state from both digital and analogue input ACTIVE/ INACTIVE No RC_Actual_L.RegioRoomTempSensorAlarm Binary value, 8 Indicate sensor alarm on room sensor ACTIVE/ INACTIVE No RC_Setp_L.RegioBypass Binary value, 9 Force the unit in Bypass mode. Is automatically returned after Bypass time (default=120 min) ACTIVE/ INACTIVE Yes RC_Setp _L.RegioShutDown Binary value, 10 Force the unit in ShutDown state ACTIVE/ INACTIVE Yes

Chapter 19 BACnet signals 87 Object name Object-ID Description Values Writable RC_Setp_L.RegioComDefaults Binary value, 11 Resets communication settings to default values ACTIVE/ INACTIVE Yes RC_Setp_L.RegioBlockConfig Binary value, 12 Prevents unauthorised access to the configuration menu via controller buttons ACTIVE/ INACTIVE Yes All binary values have normal polarity. Loop Object name Object-ID Description Regulator Loop, 0 The Regio Regulator Multistate inputs Object name Object-ID Description Values Writable RC_Actual_X.RegioFanSwitch Multistate input, 0 Fan switch state 1=OFF 2=LOW 3=MEDIUM 4=HIGH 5=AUTO No RC_Actual_X.RegioUnitState Multistate input, 1 Current unit state 1=Off 2=Unoccupied 3=Stand-by 4=Occupied 5=Bypass No RC_Actual_X.RegioControllerState Multistate input, 2 Current controller state 1=Off 2=Heating 3=Cooling No RC_Actual_X.RegioFanSpeed Multistate input, 3 Current fan speed 1=Off 2=Fan speed 1 3=Fan speed 2 4=Fan speed 3 No Multistate values Object name Object-ID Description Values Writable RC_Setp_X.RegioHeatOutputSelect Multistate value, 0 Manual/Auto heat output 1=Off 2=Manual output 3=Automatic output Yes RC_Setp_X.RegioCoolOutputSelect Multistate value, 1 Manual/Auto cool output 1=Off 2=Manual output 3=Automatic output Yes

Regio Midi manual Object name Object-ID Description Values Writable RC_Setp_X.RegioFanSelect Multistate value, 2 Fan mode select 1=Off 2=Manual speed 1 3=Manual speed 2 4=Manual speed 3 5=Auto 6=Auto 2 7=Auto 1 Yes RC_Setp_X.RegioForcedVentSelect Multistate value, 3 Manual/Auto forced ventilation 1=Off 2=Manual On 3=Auto Yes RC_Setp_X.RegioChangeOverSelect Multistate value, 4 Manual/Auto change-over 1=Heating 2=Cooling 3=Auto Yes RC_Setp_X.RegioRemoteState Multistate value, 5 Remote control unit state 1=Off 2=Unoccupied 3=Stand-by 4=Occupied 6=No remote control Yes RC_Non_Modbus.RegioButtonActiv eConf Multistate value, 6 Active buttons 1=No buttons 2=Occupancy button only 3=INCREASE/DECR EASE only 4=Occupancy button and INCREASE/DECREA SE 5=Fan button only 6=Occupancy button and fan button 7=INCREASE/DECR EASE and fan button 8=All buttons Yes Device The device object contains two writable properties; Description and Location. Description can be 17 characters long, and Location can be 33 characters long, if using single byte character encoding.

More information 5 Terms 5 Activation of the different operating modes 44 Actuators 49 Analogue actuators 49 Exercise 50 On/Off actuators 49 Thermal actuators 49 Three-point actuators 49 Analogue actuators 49 Analogue values 83 Applications 6 Auto control 51 B BACnet signal types 82 BACnet signals 83 Basic setpoint 47 Binary values 85 Bypass 43 C Calculation of the active setpoint 47 Central command 46 Central control 46 CO2 sensor and VAV control 38 Communication 7 Configuration 13 Control modes 32 Cooling 34 Cooling/Cooling 35 Heating 32 Heating or cooling via change-over 33 Heating/Cooling 33 Heating/Cooling with VAV-control 34 Heating/Cooling with VAV-control and forced supply air function 33 Heating/Heating 32 Cooling 34 Cooling/Cooling 35 D Device 87 Different operating modes 42 DIP switches 14 Display handling 58 Display indications 58 Display indications 58 E Exercise 50 F Fan control 51 Auto control 51 Fan stopped 51 Manual control 51 H Heating 32 Heating or cooling via change-over 33 Heating/Cooling 33 Heating/Cooling with VAV-control and forced supply air function 33 Heating/Cooling/VAV 35 Heating/Heating 32 Holding register 81 I INCREASE/DECREASE buttons 58 Indications 57 Communication 57 Occupancy button 57 Inputs Analogue 83 Binary 85 Multistate 86 Installation 15 preparations 12 L Labels 12 Loop 86 M Manual control 51 Measurement and testing 17 Memory function on power failure 66 Modbus signal types 67 Modbus signals 69 Models 8 More information 5 Mounting 6

O Occupancy button 46, 57 Occupancy detector 45, 46 Occupied 43 Occupied/Bypass 47 Off 42, 47 On/Off actuators 49 Operating modes 42 Activation of the different operating modes 44 Different operating modes 42 P Parameter menu 59 Preset operating mode 44 R Register Holding 81 S Setpoint display of setpoint at setpoint displacement 48 Setpoint calculation 47 Basic setpoint 47 Calculation of the active setpoint 47 Setpoint displacement 47 Setpoint displacement 47 Special functions 55 Special input CI 55 Split output signal 35 Stand-by 42, 47 SW1-7 14 T Technical data 10 Terms 5 Thermal actuators 49 Three-point actuators 49 U Unoccupied 42, 47 W Wiring 15 Wiring for basic models with 3 analogue outputs 18 Wiring for model for CO2 control 21 Wiring for models for CO2 control and fan control 25 Wiring for models for fan control 27 Wiring for models for three-point control 30