rehaU intelligent Ba heating/cooling controlS technical & inStallation manUal www.rehau.co.
REHAU Intelligent Floor heating/cooling CONTROLS Index 1.0 . . . . . . Principles of Underfloor Heating/Cooling . . . . . . . . . . . . . . . . . . . 5 1.1 . . . . . . Principle of UFH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2 . . . . . . Principle of UFC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.3 . . . . . . Fixed Flow Water Temperature (FFT) System. . . . . . . . . . . . . . . . . . . 7 1.4 . . . . . . Zone Control . . . . . . . . . . . . . . . . . . . . . . .
REHAU Intelligent Floor heating/cooling CONTROLS Index 4.0 . . . . . . Control System First Fix . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.1 . . . . . . Components Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4.2 . 4.2.1 4.2.2 4.2.3 . . . . . . . . . . . . . . . . . . . . Positioning the BA Master Controller Room Sensors and Remote Air/Floor Sensors . Location of Room, Humidity Sensor and Air Sensor . . . . . . . . . . . . . Positioning the Remote Air Sensor . . . .
9.0 . . . . . . Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 9.1 . . . . . . Pre-commissioning Requirements . . . . . . . . . . . . . . . . . . . . . . 44 9.2 . . . . . . The Commissioning Team . . . . . . . . . . . . . . . . . . . . . . . . . . 44 10.0 . . . . . . CT Set Up Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 10.1 . . . . . . Programmable Room Sensor, Domestic Hot Water, Radiator and Two Stage Controller . . 45 11.0 . . . . . .
REHAU Intelligent Floor heating/cooling CONTROLS Index If a floor heating system is added to an existing heating or hot water system, containing mild steel pipes, a strainer must be fitted straight after the branch off. All REHAU control systems must be installed.
1.0 Principles of Underfloor Heating/Cooling 1.1 Principle of UFH Thermal Comfort REHAU underfloor heating system operates on the basis of low surface temperatures and even temperature distribution across the whole floor with comfortable radiant energy. In contrast to other heating systems the radiative equilibrium between occupants and the surfaces in a room is established and an optimum level of comfort is achieved.
1.0 Principles of Underfloor Heating/Cooling 1.2 Principle of UFC Advantages of a Underfloor Cooling System - High level of comfort - Preserves resources Classic air conditioning systems Traditional air conditioning systems overcome the cooling loads that occur by changing the air, with the following negative effects: -D raughts - Unrestricted interior design.
1.0 Principles of CONTROLLING FLOOR HEATING SYSTEMS (FH) 1.3 Fixed Flow water temperature (FFT) System A conventional boiler system including radiators and domestic hot water (DHWS) provides water with a flow temperature in the region of 80ºC. Water is pumped by a Main (system) pump to the hot water cylinder and to the radiators, where it loses temperature and on the return, the water temperature normally stays at around 69ºC.
1.0 Principles of CONTROLLING FLOOR HEATING SYSTEMS (FH) 1.4 ZONE CONTROL Master Controller ZV IV IV UFH - Flow TMV HLS CP IV AC AC AC AC UFH - Manifold UFH - Return RT RT RT RT 5. Individual zone control with FH The REHAU INTELLIGENT zone control system is a simple electronic control system that has been specifically designed to give optimum and accurate control of Floor Heating systems. Heating/Cooling circuits are connected to a central manifold.
2.0 Fixed FLOW temperature control 2.1 required components for fixed FLOW temperature control Authorised Specialists Installation, commissioning, maintenance and repairs of all electrical control components shall only be carried out by trained, competent and qualified specialists in accordance with the national, valid regulations (Health & Safety, Wiring Regulations, etc) and in compliance with the ordinances stipulated by the local power authorities.
2.0 fixed FLOW temperature control 2.2 Fixed temperature mixing options 2.2.1 Compact Mixer Unit - Only for domestic/light commercial applications - For outputs up to 12kW use 1/2" valve set (not to be used to size primary pipes) - For outputs between 12 - 18kW use 3/4" valve set (not to be used to size primary pipes) - The circulating pump only circulates the warm water through the circuits. A separate main system pump is needed to supply the manifolds with hot water from the boiler. 6.
CT2/HW Junction Box CMU HWS CT2/R CT2/HW SV ZV HLS AV BPV SV PV CS RS TMV LSV TRV BA Controller CT2/R Compact Mixer Unit Hot Water Supply Radiator Controller Domestic Hot Water Controller Safety Valve Zone Valve High temperature Limit Thermostat Air Vent By pass Valve Safety Valve Pressure Vessel Cylinder Sensor Room Sensor Thermostatic Mixing Valve Lock Shield Valve Thermostatic Radiator Valve HWS Hot Water Sensor Hot Water Cylinder AV Radiator TRV LSV RS Manifold Flow Header HLS CMU ZV Manifo
2.0 fixed FLOW temperature control 2.2 Fixed temperature mixing options 2.2.3a Before the system is switched on, the following settings have to be carried out: - Balancing valve (BV) set to fully open as per recommendations on the instruction leaflet supplied with the compact mixer - Thermostatic inlet valve (TIV) set to design flow temperature 2.2.4 Thermostatic Mixing Valve (TMV) - Suitable for all applications, below 30Kw.
To improve the response time even further it is recommended to fit a differential bypass valve (BPV) as close to the thermostatic mixing valve (TMV) as possible. This can reduce the time it takes for the hot water from the boiler to reach the mixing valve. 2.2.
2.0 FIXED flow temperature control 2.
2.2.7 Required Components for Zone Control Masters/ Add On modules Quantity Components REHAU Art. No. Heating Heating/Cooling REHAU BA 202236-001 No Yes BA Cooling Kit 202233-001 No Yes Add On, Module 225115-002 Up to 8 zones: 0x Up to 14 zones: 1x Components REHAU Art. No.
2.0 FIXED flow temperature control 2.2 fixed temperature mixing options 2.2.8 Wiring BA Controller UNIT NUMBER (1-9) 2 5 4 3 2 4 9 8 7 6 1 9 5 0 1 0 F E 3 STRING NUMBER (1-F) D C B A 8 7 6 DIP SWITCH ON OFF 1 230VAC C2 L L N 2 N L THERMAL ACTUATORS 3 4 L N L N N 6 N L 7 N L 8 N L N DISPLAY SUPPLY SENSOR L 5 L X-Relay SEC. PUMP VOLT FREE 230VAC L N L N 6 N L 7 N L 8 N L N EXT.
Zone Valve wiring connections for Volt Free boiler Switching Zone Valve wiring connections for 230v boiler Switching BA Controller (Main Control) RJ45 NETWORK BUS Switch Live To Boiler BOILER B1 B2 SUPPLY 230VAC L N Grey wire should taken to the connector of the volt free supply and connected X-RELAY SEC. PUMP VOLT FREE 230VAC L N L N N SUPPLY 230VAC L N Switch Live To Boiler BOILER B1 B2 X-RELAY SEC.
2.0 FIXED flow temperature control 2.2 fixed temperature mixing options BA Master Controller (Main Control) 2 5 4 3 2 4 1 9 8 7 6 3 5 0 9 1 0 F E D C B A 8 7 6 DIP SWITCH ON OFF UFH PUMP 230VAC L 1 N L 2 N L N THERMAL ACTUATORS 3 4 L N L N 5 L 6 N L 7 N L 8 N L N DISPLAY L 5 L 7 6 N L N L 8 N L N EXT. SWITCH I O MIXING VALVE 0 - 10V THERMOSTAT BUS SUPPLY SENSOR N + + + + Y + EXT.
2.0 Fixed Flow temperature control 2.3 Temperature safety options Recommended Position for HLS ZV IV IV TMV HLS CP IV UFH - Flow AC UFH - Manifold UFH - Return 16. Recommended Position of HLS (3-Port) valve 2.3.1 High Limit Sensor (HLS) 2.3.2 Working Principle The sensor of the high limit sensor (HLS) monitors the mixed flow temperature. This is a safety device, which should be set to a temperature of 15ºC above the max. design flow temperature. In the case of a system malfunction and the max.
2.0 FIxEd Flow tEMPERAtURE contRol 2.4 2-PoRt ZonE vAlvE (Zv) 2.4.1 Working Principle The 2-Port zone valve (ZV) has a dual function: - To separate the floor heating system hydraulically from other systems supplied by the same heat source, such as the domestic hot water system (DHWS) or radiators - Close down the flow of hot water from the boiler in case of a boiler malfunctioning.
2.0 Fixed Flow temperature control 2.4 2-port Zone valve (ZV) 2.4.2 Installation Required Components Qty Supplied by REHAU 2-Port Zone Valve of correct size 1x Yes Compact Mixer Unit BV Fitting (always read and follow instructions supplied with components) - The valve should be installed without blocking any vent or cold feed when closed HLS UFH - Flow CP AC ZV - For recommended positions refer to CPFig. 17.
3.0 REHAU IntEllIgEnt HEAtIng/coolIng contRol SYStEM 3.1 coMPonEntS ovERvIEw 3.1.1 Components Overview Heating Component Article number REHAU BA, Master Controller 225113-002 (24V) Constant Temperature The REHAU BA Master Controller is suitable for connecting up to 8 zones of multiple sensors and 24V actuators. In addition it provides outputs for the FH secondary pump, main pump and boiler demand signal. 225115-002 (24V) The Add On Module provides another 6 zone connections.
Component Article number REHAU Remote Air Sensor 228007-001 (5V) Remote air sensor works only in conjunction with a TM thermostat. (Also available in Brass/Aluminium, please contact sales office 225385-001 The seperate floor sensor works only in conjunction with a CT2 Programmable Room Sensor or TD sensor. 202239-001 (5V) If the distance between the master and the Add On Module exceeds 0.3m, then net extension kit is required.
3.0 REHAU IntEllIgEnt HEAtIng/coolIng contRol SYStEM 3.1 coMPonEntS ovERvIEw 3.1.2 Additional Components Overview Heating/Cooling Component Article number BA Cooling Kit 202233-001 (5V) The BA Cooling Kit contains a humidity sensor, WLAC switch and a flow temperature sensor. This kit when integrated into the system helps prevent the flow of water temperature below the dew point ( in cooling mode) and there by prevent condensation. 3.1.
Component Article number REHAU RF CT2 / R, Radiator Controller 202249-001 (5V) This wireless 24/7 clock combined with the 4-event timer enables the user to control the temperature of a circuit or Zone of Radiators that are hydraulically independent from an underfloor heating system. For more information refer to section 11.2, see page 55. 202229-001 (5V) This wireless 24/7 clock combined with the 4-event timer enables the user to customize his room temperature according to his requirements.
3.0 wIRElESS SEnSoRS/contRollERS 3.2 woRkIng PRIncIPlE Traditional ON/OFF control 20.5ºC Advanced PI- control OFF 20.0ºC 19.5ºC HEAT 100% ON The graph above left shows the ‘hunting’ temperature profile of a room with a traditional sensor. PI- control gives a more stable and accurate room temperature - for higher comfort levels. The graph above right shows the stabilising effect of the PI controller, improving comfort and saving energy. 18.
Considering the graph above we see that the desired set point temperature is set at 20°C by 8am. As the REHAU intelligent master uses a software algorithm to control the time to warm up, this varies the required start up point by learning from its previous sensor history and only switching on at the last possible moment to allow the room to reach set point at the desired time. The result is a significant energy saving that is achieved as indicated in blue on the graph above. 3.
4.0 Control System First Fix 4.1 Components Overview All REHAU control systems must be installed: - By a competent person The cable termination length at the sensor position should be long enough to allow for connection to the sensor i.e.150mm. This should then be coiled and positioned within an electrical back box. Both Flush and surface electrical back boxes can be used.
4.0 Control System First Fix 4.2 Positioning the BA Master controller Room Sensors and Remote Air / floor Sensors 4.2.1 Location of Room, Humidity Sensor and Air Sensor The requirement for the correct positioning room sensors cannot be overstated. Care must be taken to ensure the sensors are located; 1. In a position with good air circulation at the ambient temperature preferably on an internal wall at a height of 1.6 metres from floor level. 2.
5.0 Control System Second Fix 5.1 REHAU BA Central Control Unit BA WLM.
5.0 Control System Second Fix 5.2 Electrical Connection Ensure that the electrical installation is carried out in accordance with the local wiring regulations and the IEE wiring regulations as set out in BS 7671. 5.2 Electrical Connection The 230v AC mains supply The cable from the main system, switch fuse spur should be connected via a local isolation switch to the mains terminal block within the REHAU BA control unit marked L, N, E (As shown in Fig. 22). MAINS SUPPLY FROM 3 AMP FUSED ISOLATOR 22.
5.0 contRol SYStEM SEcond FIx 5.2 ElEctRIcAl connEctIon 5.2.2 Pump Outputs - UFH Pump The master has an output for the underfloor circulating pump (secondary pump). The output will be energised with a delay of 180 sec after the demand from the room sensor. The delay is to allow time for the thermal actuator to open. SUPPLY 230VAC L N BOILER B1 B2 X-RELAY C1 C2 SEC. PUMP UFH 230VAC L N The 230v AC pump can be connected directly to terminals L and N under the heading “Sec. UFH Pump”.
230V output from X-relay The X relay output is volt free as shown in fig.26 If the relay is required to be used as an L & N switch, connect a link wire from mains live to C1, connect the device live to C2, and the device neutral to mains Neutral. 5.2.3 Connecting REHAU Add On, Extension Modules The addition of REHAU Add On Extension modules (max 1 Add On module) will increase the zoning potential from 8 to 14 zones. RJ 45 Connection SUPPLY 230VAC L N BOILER B1 B2 X-RELAY C1 C2 SEC.
5.0 Control System Second Fix 5.2 Electrical Connection 5.2.4 Connecting Room Sensors REHAU INTELLIGENT room sensors operate on a 5v common bus system. Both the REHAU BA Master Controller has four sets of identical terminals, which can be used for the connection of the sensors. Any sensor can be connected to any of these terminals. Remember to connect + to + and I to I .
BA Master Controller N L N L N L N L UNIT NUMBER (1-9) STRING NUMBER (1-F) N 0 4 L 9 THERMAL ACTUATORS 24V 5 N 9 8 7 6 L 5 4 3 2 N 1 L 2 N 1 0 F E L 3 OUT PUT 1 Out put 2 Out put 3 Out put 4 Out put 5 Out put 6 Out put 7 Out put 8 D C B A 8 7 6 DIP SWITCH ON OFF X-RELAY C1 C2 SEC. PUMP 230VAC L N 1 L 2 N L N THERMAL ACTUATORS 3 4 L N L N 5 L 6 N L 7 N L 8 N L N DISPLAY SUPPLY SENSOR L 5 L 6 N L 7 N L 8 N L N EXT.
5.0 Control System Second Fix 5.3 Room Sensors internal connections Master Controller SENSOR BUS + T T + SENSOR BUS T T T T Sensor Connect + to + and T 30. Removing the front cover (all sensor variants) + + Sensor to T T + + + T + 32.Sensor internal wiring, Star configuration Master Controller SENSOR BUS + To Controller T T + SENSOR BUS + T T + + + + + Sensor T to TM Room Sensor T T T T Connect + to + and T + + Sensor 31.
Sensors with a remote air sensor have a mechanical jumper on the right hand side of the printed circuit board controlling the sensor function. Temperature dial Jumper in position for remote air sensor Mode selection switch If the sensor is to be positioned within the space then leave the mechanical jumper parked on one of the terminal pins. The sensor should be supplied with the mechanical jumper in this position.
6.0 wIRElESS SEnSoRS/contRollERS SEt UP 6.1 RAdIo FREqUEncY (RF) REHAU wireless sensors can be used in conjunction with wired sensors. When using wireless sensors, a receiver unit has to be connected to the main controller. The sensors/controllers are powered by standard AAA batteries and an alarm signal indicates when these are running low. A frequency band of 868 MHz is used in order to maximise communication stability. 6.1.
REHAU Wireless Receiver (RC) REHAU BA Master Controller 36. Connection of Master And Wireless Receiver 6.1.2 Technical Data Supply Voltage 24 V from Master Distance to master Max 3 m Enclosure IP 21 Ambient temperature range 0 to 40°C Communication Frequency 868 MHz Communication distance Up to 30m inside building and 100m line of sight Connection of master and receiver The receiver is connected to the master or the add on module using the included cable.
7.0 Setting up BA Master controller (Cooling) The REHAU BA Master Controller is an independent floor heating / cooling control system. It requires manual switching of the system from heating to cooling and back to heating using a WLAC switch or a volt free signal from the BMS. Thus, being able to give an output demand signal to boiler, chiller or a reversible heat pump.
BA Master Controller STRING NUMBER (1-F) UNIT NUMBER (1-9) 5 4 3 2 Out put 8 L N 5 8 7 6 DIP SWITCH ON OFF 1 L 2 N L N 3 4 L N L N THERMAL ACTUATORS 5 L 6 N L 7 N L 8 N L N DISPLAY 1 2 3 4 5 6 7 8 SUPPLY SENSOR L N MIXING VALVE 0 - 10V THERMOSTAT BUS + T Out put 7 L N + T Out put 6 L N 4 9 8 7 6 1 Out put 2 Out put 3 Out put 4 Out put 5 L N L N L N L N THERMAL ACTUATORS 24V 2 9 OUT PUT 1 L N 3 0 1 0 F E D C B A Y NETWORK BUS X NETWORK BUS X-RELAY C1 C2 SEC.
8.0 System Start Up and Operating Instructions 8.1 Setting the Sensor Channel Number Set the channel selector within the various sensors so that it corresponds with the thermal actuator output that it must activate. Each sensor on the system is to be allocated a channel number. Under the front cover of all sensors a selector can be accessed. (As shown in Fig. 40).
8.0 System Start Up and Operating Instructions 8.2 REHAU BA Master Controller The BA Master Controller comes with pre-set temperatures, these pre-set values are fixed so the REHAU BA Master Controller should always be used in conjunction with at least one REHAU CT2 Programmable Room Sensor. However if a REHAU CT2 Clock sensor is fitted to the system it will override the fixed and the programmed parameter set in the REHAU BA Master Controller.
9.0 Commissioning The definition of commissioning, according to CIBSE (Chartered Institution of Building Services Engineers) is the advancement of an installation from static completion to working order to specified requirements. The commissioning of a system is essential to obtain the design operating parameters of the UFH system as set out by the system designer. Co-operation between all parties involved with the design and installation of the FH and control system is essential. 9.
10.0 ct SEt UP gUIdE 10.1 CT2 CT2 / 2 PRogRAMMABlE RooM SEnSoR, doMEStIc Hot wAtER, RAdIAtoR And two StAgE contRollER Programmable Room Sensor, CT2 / R Radiator Controller, CT2 / HW Two Stage Controller Domestic Hot Water Controller This user guide applies for all the controllers mentioned above, with certain instructions only for specific controllers. A: B: C: Display Adjustment down OK - accept D: E: R F: Adjustment up Reset to factory setting Pin button adjust of clock 42.
1. 1 2 3 4 5 6 7 1 2 3 4 5 6 7 The time will have to be set as soon as the CT2 Programmable Room Sensor is switched on for the first time, the hour digits start to flash. :00 1.1a To change the hours on the clock, use the default) and then press . and to select the correct hour (24 hour clock is I I:00 1.1b Then the minutes will start to flash, adjust as above and press 1 2 3 4 5 6 7 2 3 4 5 6 7 to confirm. I I:23 1.2 The day of the week then has to be set.
1.6 Repeat for each channel as desired. To leave this menu, either go through all 14 channels and press ESC (below) or don’t press any buttons for 10 seconds and it will revert to main screen. 1.7 To quit a sub-menu at any time, navigate the menus until you reach ESC and press . N.B. Steps 1 - 3 are a requirement to enable the correct operation of the control system. Steps 4 - 8 are optional. 1.8 The date and time are now set. 2 I I:23 N.B. Time has to be manually changed between BST and GMT.
1 2 3 4 5 2.1a Hold the button for 3 seconds. This screen will be displayed. This shows the start time of the first event, DAY, which is the first time the heating comes on. If this is to be changed, use the UP and DOWN arrows like when setting the time. If it is not to be changed, press 1 2 3 4 5 twice to move on. 2.1b This is the temperature for the DAY event. to continue. Adjust if required as above. If not press N.B.
2.6a Days 6 and 7 (Saturday and Sunday) only have 2 events - DAY and NIGHT. This screen shows the start time of day event. 6 7 Adjust if required as above. If not press twice to continue. 2.6b The temperature for DAY event at weekend. Adjust if required as above. If not, press to continue. 6 7 2.7a The time which the NIGHT event starts at weekend. twice to continue. Adjust if required as above. If not press 6 7 1 2 3 4 5 2.7b The temperature for the NIGHT event. Adjust if required as above.
4. changing event sequence over different days (if required) Hold UP and DOWN buttons to reach sub-menus. Scroll through and press on Pro. The 5 possible sequences below can be scrolled through and selected by 4.1a 4 events on 5 days, 2 events on 2 days (default). 1 2 3 4 5 4.1b 4 events on 6 days, 2 events on 1 day. 1 2 3 4 5 4.1c 4 events for 7 days. 1 2 3 4 5 6 7 4.1d 2 events for 7 days. 1 2 3 4 5 6 7 4.1e 2 events for 5 days, 1 event for 2 days. 1 2 3 4 5 5.
5.1 Adjust maximum floor sensor temperature with UP and DOWN buttons, press to confirm. N.B. Only a maximum OR minimum floor sensor can be fitted to each CT2 Programmable Room Sensor, not both. 5.2 Select LoLi if minimum floor sensor fitted. 5.3 Adjust minimum floor sensor temperature as above. 6. to See current Sensor Info Hold UP and DOWN buttons to reach sub-menus. Scroll through and press on InFo. 6.1 The first screen shows the software version. 6.
7.1 Press UP and DOWN to scroll through options and to select desired scale. The first is 24 hour clock and temperature in celsius. 1 2 3 4 5 6 7 AdAP 7.2 24 hour clock and temperature in fahrenheit. 7.3 12 hour clock and temperature in celsius. 7.4 12 hour clock and temperature in fahrenheit. 8. Turning on Adaptive function ensures that the room will reach the correct temperature at the desired time. Hold UP and DOWN buttons to reach sub-menus. Scroll through and press on ADAP. 8.
Below only required for CT2 / 2 Controller (Two Stage Controller) 9. 1 2 3 4 5 6 7 To change advanced settings on the two stage controller Advanced settings on two stage controller. Using these settings, the secondary heat source could be turned on if the room does not reach the correct temperature in the desired time. An example would be to bring the second stage if temperature has not reached 2°C of the set point within 30 minutes Hold UP and DOWN buttons to reach sub-menus.
11.0 Domestic Hot water (DHW), Radiators and Two stage controller 11.
11.0 Domestic Hot water (DHW), Radiators and Two stage controller 11.
11.0 Domestic Hot water (DHW), Radiators and Two stage controller 11.3 TWO Stage room temperature controller Master Controller 0 DIP SWITCH ON OFF 1 2 3 4 5 6 7 8 RJ45 NETWORK BUS N L 3 N 4 L N L N THERMAL ACTUATORS 5 L 6 N L 7 N L 8 N L N DISPLAY L MIXING VALVE 0 - 10V THERMOSTAT BUS SUPPLY SENSOR N + T L 2 + T 1 Y X NETWORK BUS C1 C2 1 230VAC L N L 2 N L N THERMAL ACTUATORS 3 4 L N L N 5 L 7 6 N L N L 8 N L N EXT.
12.0 Special Functions 12.
12.0 Special Functions 12.
12.0 Special Functions 12.3 Holiday OVERRIDE Function Dependent upon the control system configuration it is possible to override all the automatic functions of the control system with a single function. This action can be used for holiday periods (e.g. to set the whole system into a frost protection mode), or to temporarily override all the temperature control of the system. Below are set out two options.
12.0 SPEcIAl FUnctIonS 12.4 cHEckIng contRol SYStEM oPERAtIon After setting the channels, it is possible to check the entire control system. Area circled shows the DIP switches on the Master Controller System check procedure 1. Sensor check: a. Switch on DIP-3 to activate sensor check - power light starts blinking. b. Each red channel light on the Master Controller should now be lit if a Room Sensor is present on that channel. c.
13.0 TroubleShooting and Error/Fault Messages 13.1 Troubleshooting Problem Possible cause & Solution Channel light is not coming on (When in Sensor Check (DIP3) Mode) Make sure the power light is blinking. If not then put DIP-3 to ON position. 2-wire bus may be incorrectly connected. Voltage at each Room Sensor should not be lower than 4.0V (check for + & - continuity and short circuits). For Wireless Room Sensors, please check that the batteries have been inserted correctly.
13.0 TroubleShooting and Error/Fault Messages 13.1 Troubleshooting Problem Possible cause & Solution Mixing valve does not operate correctly (When in install mode) Incorrect connection, see master wiring diagram for correct connection. Valve/actuator assembly is incorrect. Actuator is faulty. Check what happens if sensor and/or outdoor module is missing. (Valve cycles between open and closed in normal operating mode) Valve may be oversized. Supply Limit sensor may be subject to heat migration.
13.0 TroubleShooting and Error/Fault Messages 13.2 Error/Fault Messages During normal operation the green power LED will be ON when the Master Controller is energised. The red output Channel LED’s (1 to 8 on the Master Controller, and 9 to 14 on the Add On Module) will indicate if the channel output relay is ON/OFF. An error / fault message is shown by flashing the green power LED or one of the 8 red output Channel LED’s.
13.0 TroubleShooting and Error/Fault Messages 13.2 Error/Fault Messages Flashing output LED (red): The appropriate output channel LED can flash, indicating that the Room Sensor or Controller on that channel has a fault/error. The failure code can also be seen in the service menu (submenu 2a). Flashes Description Corrective action 1 Flash The Master Controller has lost communication to the Room Sensor.
14.0 ResetS BA WLM. Hydronic Master 1 2 3 4 5 6 7 8 There are two different reset actions that can be used on the BA Master Controller: Resets To Enable Function Hard Reset* (used if there is a faulty sensor) Press the “ ” button on the BA Master Controller for 5 seconds; a HARD RESET will be initiated (indicated by all the red output LED’s (1-8) rapid lighting in sequence).
15.0 Sensor failure/actuator and pump exercise 15.1 Sensors/Controller Failure If a Room sensor/controller is defective or if the communication to the unit is interrupted, an alarm will be triggered. Depending on the system configuration the control will continue in one of the following ways.
16.0 Wiring Schematic - Next Generation REHAU BA controller with ADD On module CT2 PROGRAMMABLE ROOM SENSOR COMFORT PLUS SENSOR LIMITFLOOR SENSOR STANDARD SENSOR UP TO 14 CHANNELS + + REHAU CT CHANNEL 1 T T A CHANNEL 2 + + TD - CHANNEL 14 - + + T T + + REHAU TA T T REHAU 4 Core cable minimum 0.25 mm² UNIT NUMBER (1-9) 5 4 3 2 L N DISPLAY SUPPLY SENSOR L N 5 DISPLAY LEARN MODE BOILER TEST 8 N NETWORK BUS SENSOR BUS + + 1 L SEC.
Our verbal and written application engineering advice is based upon experience and the best of our knowledge. However it is to be regarded as non-binding information. Working conditions and use under conditions for which the product was not intended and over which we have no influence exclude any claim resulting from our information. We recommend that a suitable check is made as to whether the REHAU product is suitable for the envisaged purpose.
