NEA Service Manual
Contents
1. 18 dde OCTO ae ee ne 18 42n Operating in service and expert level 18 4 3 DEVICS NO RS a de de n ad de de h ead cea een EEEE aca 19 44 EXDCM EVE a4 aig dee apn deshe eae pady eae aay Haahendy Sea ned eae end yee paneer ee 21 4 5 Special MUNCH ONS ae ee a a ue 24 dass Error MCSSA0C Siac cosas even ae den ee a de nee dde Co des 25 0 Troubleshooting a os erie a ea ea cae ewes cele 26 eee CE ECS EEE 28 Page 2 of 30 SERVICE MANUAL ROOM TEMPERATURE CONTROLLER NEA 230V 24V 1 Information and safety guidelines Validity This service manual is valid for Germany and Austria Navigation At the beginning of this manual you will find a detailed table of contents with hierarchical headlines and the corresponding page numbers Pictograms and logos Safety information 3 Legal information G Important information to be considered This service manual is an additional and pursuing information for experts It is valid for room temperature controllers Nea 230V and Nea 24V in combination with the wiring centres and the other components of the control system This manual is no replacement for the instruction and instal lation manuals which come with the units For fundamental guidance concerning wiring and operating please see the instructions that come with the units These instructions are also available for download2. C Minimum value for set point cooling select able in user level C Maximum value for set point cooling select able in user level C Width of proportional band for room tempera ture control in heating mode K See also chapter 7 Width of proportional band for room tempera ture control in cooling mode K See also chapter 7 Cycle time of Puls Width Modulating output signal of room temperature control in min utes See also chapter 7 PWM signal in when temperature set point is achieved This defines the position of the proportional band and at the same time the needed heating cooling power when the set point is reached See also chapter 7 0 heating mode only enabled 1 cooling mode only enabled 2 Heating and cooling mode enabled 1 Switch over between heating cooling only by input keys 2 Switch over between heating cooling only by CO input signal After switching operation mode trom heating to cooling or reverse the output signal will be blocked for this time span min The new operating mode starts to be active after this time Default 16 24 18 30 20 Min value 6 0 5 0 5 10 Max value 37 37 37 on 60 90 60 Nea Nea Nea H HT HCT Vo x v V v V VV Vv V V L Vv V Ls x v V V4 Page 21 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Para Description meter PE12 Enable optimization function PE13 En
3. 0 1K reading Offset value for internal room temperature probe Offset value for external temperature probe floor temperature probe Display of actual temperature value from external temperature probe The state of switching output for actuator is shown ON OFF Comment The state of output is also displayed in end user level with the heating or cooling symbol Only 24V controllers Number of actuators directly connected to switching output Default ON 22 24 26 Min value OFF 0 C OFF Max value ON 37 37 on 37 5K 5K 50 C ON Nea T Nea Nea HT HCT Vv V4 V4 V4 V4 Vv Vv V4 V4 Vv Vv Page 20 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 4 4 Expert level Access with password 314 Para Description meter PEOT Minimum value for set point heating PE02 Maximum value for set point heating PEO3 Minimum value for set point cooling PE04 Maximum value for set point cooling PE05 Proportional band width heating mode PE06 Proportional band width cooling mode PEO7 Cycle time of PWM signal PE08 Position of propor tional band PE09 Enable Heat ing Cooling PE10 Enable change heat ing cooling mode PE11 Delay time after switching heating cooling Copyright by REHAU Comment Minimum value for set point heating select able in user level C Maximum value for set point heating select able in user level
4. Safety transformer 230 V AC 24 V AC according EN 61558 power 50 VA Copyright by REHAU Page 5 of 30 SERVICE MANUAL ROOM TEMPERATURE CONTROLLER NEA 230V 24V 2 2 Functional overview Heating Cooling Temperature reduction by internal time switch program Temperature reduction by external Timer Nea possible Display of current temperature Display of current time and weekday Setting of 3 timing programs per day Party and holiday mode Integrated frost and valve exercise function Switching of operating mode heating cooling manually or externally Remote temperature probe connectable Nea H NeaHT NeaHCT v A NN SN S NO A ADA Page 6 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 2 3 Technical data Room temperature controller Nea Colour Operating voltage Max switching current Fuse Safety Max number of actuators Degree of protection Frost protection mode Dimensions front Dimensions rear Depth Storage temperature Ambient temperature Application Remote temperature probe Nea Sensor type Cable length Protection class Timer Nea Operating voltage Number of memory locations Power reserve Copyright by REHAU Nea 230 V Nea 24 V Front plate white RAL 9016 Back cover anthracite grey RAL 7016 230 V AC 10 0 2 A resistive load T 0 63 A T1A 24 V AC 10 20 1 A resistive load Class Il Class IIl 5 thermal actuators IP 30
5. N Unlimited Polymer Solutions reddot design award winner 2013 ROOM TEMPERATURE CONTROLLER NEA 230V 24V Construction Automotive Industry SERVICE MANUAL ROOM TEMPERATURE CONTROLLER NEA 230V 24V TABLE OF CONTENTS 1 Information and safety guidelines 3 2 System TES CTIDAONE SL se his ie M ou his on aida inc ou nie ane 5 ZA nade System compon nts NE a da pee AON Sede ot dede eco 5 i ae Functional overview ea Ge de a aaa 6 rA re Technical dala s se oe oi ot oe ere eat ln EE REA RE E E e E A EE eaten T D HS AO a a nada dada RA 10 de System structure 4444444222 10 on Wiring of room temperature controllers Nea H Nea HT to wiring centre Nea H 230V 24V 11 Jr Wiring of room temperature controllers Nea H Nea HT without use of wiring centre 12 di Wiring of room temperature controllers Nea HCT to wiring centre Nea HC 24V 13 On ss Wiring of room temperature controllers Nea HCT without use of wiring centre 14 SA EE Use of dew point monitors Se ae le a de cn 15 Te Wiring of timer Nea to wiring centre Nea 16 OO yeas Wiring of a pump to wiring centres Nea with pump module 17 Renee Parameterization and special functions
6. PE17 1 the lower limit of the floor temperature is only consid ered in cooling mode the cooling is stopped when the limit is reached PE17 2 the lower limit of the floor temperature is also consid ered in heating mode heating is done in any case until the con figured limit is reached CO signal The CO signal change over indicates the change from heating mode to cooling mode It is generated by a superordinated con trol system or device e g a heat pump A potential free contact is needed for the connection of the signal to the wiring centre Optimization function The optimization function of the controller checks periodically whether the room temperature is below or above the set point Thereafter an adaption of the control behaviour follows however in only small steps Because of this the result of the optimization can only be seen after a longer time frame Proportional band The proportional band better said the width and the position characterizes the control behaviour of a proportional controller The output signal of the controller descends from 100 begin ning from one end of the proportional band to 0 on the other end of the proportional band Output signal 100 output 25 room temperature actual room temperature room temperature setpoint The diagram shows the working principle of a proportional con troller P controller in heating mode The width of the propor tional band i
7. The signal for reduced mode has to be potential L 230V systems or L1 24V systems The signal may be generated by a timer or by a switching contact common or for each controller separate fe EE In installations with more than one feed in of operating voltage e g several manifolds and therefore several wiring centres phase equality must be observed as soon as there is any electrical connection between the groups of control systems Copyright by REHAU Page 12 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 3 4 Wiring of room temperature controllers Nea HCT to wiring centre Nea HC 24 V wiring centre Nea HC 24 VA AC Fig 3 4 Wiring of room temperature controller Nea HCT to wiring centre Nea HC 24 V Comment The CO signal is generated inside the wiring centre As soon as the external switch connected to the shown pair of terminals is closed the connected controllers change to cooling mode D Controllers which are not allowed to change to cooling mode e g in bath rooms have to be connected in the same way as shown in the wiring diagram Blocking of cooling mode is done by parameter PE9 It is not provided to connect controllers Nea H or Nea HT to a wiring centre Nea HC 24V These controllers are only designed for installations with solely heating mode and would have to be blocked in cooling mode by additional actions Copyright by REHAU Page 13 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230
8. only be per formed by professional electricians trained for this purpose General safety precautions Keep the work area clean and free of impeding objects Provide sufficient lighting at the work area Keep children house pets and unauthorized persons away from tools and the assembly sites This is especially impor tant in cases of renovation in inhabited areas Use only the intended components for the respective RE HAU system The use of components or tools from other companies which are not from the respective REHAU in Stallation system can lead to accidents or other dangers Copyright by REHAU Page 4 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 2 System description Wiring centre Nea H and Nea HC Wiring centre for room temperature controllers actuators and 2 1 System components Nea timer Room temperature controller Nea H Nea HT und Nea HCT Room temperature controller for 230V AC or 24V AC for the applications heating and heating cooling Fig 2 3 Wiring centre Nea H und Nea HC Timer Nea 2 channel weekly timer Fig 2 1 Room temperature controller Nea H HT and HTC Remote temperature probe Nea Usable in combination with controller Nea HCT as floor tempera ture probe or as additional room temperature probe Fig 2 4 Timer Nea Actuator Thermal actuator with 230V AC or 24V AC supply voltage Fig 2 2 Remote temperature probe Nea protection class IP54 Transformer 50VA
9. the value 1 Open operating mode selection by pressing Enter Exit key Scroll with and keys until display shows HC Select HC by pressing Enter Exit key Select symbol ee for heating or for cooling using and keys Confirm with Enter Exit key Key lock Key lock is activated by parameter PS09 set parameter to ON After setting parameter to ON there is a delay time of 30 min until key lock is activated After activation of key lock function all keys are locked and whenever a key is pressed the display shows a lock symbol for 1 second Temporarily cancelation of keys locks Press all keys at the same time for about 5 sec Input of password is demanded Enter password 410 and confirm After this keys are released for 30 min During this time changes of set points or similar actions can be done Resumption of key lock is done automatically after 30 min If permanent removal of key lock is wanted during this time parameter PS09 can be reset Connection of more than 1 actuators to controller Nea 24 V If more than 1 actuator is connected to a controller Nea 24 V the number of actuators has to be inserted in parameter PS23 only Nea 24V Copyright by REHAU Page 24 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 5 Error messages No Description Fr Frost protection Er1 Remote temperature probe out of range Interruption of remote tempera Er2 ture probe S
10. 5 C 88 x 88 mm 15x75 mm 26 mm 20 60 C 0 50 C In enclosed spaces NTC 10K 10 kOhm 1 at 25 C 4m IP 67 230 V AC 84 10 years Page 7 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Nea wiring centre Nea wiring centre 230 V Heating Nea wiring centre 24 V Heating Heating und Cooling Colour Lower housing and head section dark grey similar RAL 7021 cover light grey similar RAL 7035 Operating voltage 230 V AC 24 V AC Switch contact of pump relay Potential free relay 230 V AC 5A 24 V DC 1A Fuse T4AH T2A Safety Class Il Class III Maximum number of controllers 6 Max number of actuators 12 thermal actuators Number of terminals for timing 2 programs Degree of protection IP 20 Frost protection HC Dimensions Hx W x L 74 mm x 40 mm x 300 mm Ambient temperature 0 60 C Humidity Max 80 non condensing Application In enclosed spaces Transformer 50 VA for supply needed only variant with pump relay Timer Nea needed Transformer 50 VA Operating voltage 230 V AC Output voltage 24V AC Power 50 VA Dimensions W x H x D 68 mm x 70 mm x 75 mm Other technical data Safety transformer according EN 61558 Conditionally short circuit proof with integrated over temperature protection Connecting cable primary side with moulded in plug length 100 cm Cable on secondary side 30 cm Mounting plate included with clipses for mounting rail Copyright by REHA
11. SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 3 7 Wiring of timer Nea to wiring centre Nea l nandan l e a I A Niet l C1 OFF C2 OF C C ne N O E Fig 3 7 Wiring of timer Nea to wiring centre Nea D Please note that it is absolutely required to connect terminals 2 and 5 of timer Nea to the wiring centre in the shown way When terminals 3 and 6 of timer Nea are used programming of timer has to be done in a way that time periods with normal mode are ON the time periods with reduced mode are OFF The shown connection method is valid for all types of wiring centres Nea Copyright by REHAU Page 16 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 3 8 Wiring of a pump to wiring centres Nea with pump module terminal box wiring center with option pump logic Fig 3 8 Wiring of a pump to wiring centre Nea with pump module O By connecting live of mains voltage for pump supply to the wiring centre an external voltage is brought inside the wiring centre Note the maximum switching capacity of the pump relay in the wiring centre 5A 230 V AC 1 A 24 V DC The shown connection method is valid for all types of wiring centres Nea with option pump module Copyright by REHAU Page 17 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 4 Parameterization and special functions 4 1 Introduction All parameters of the Nea controllers are pres
12. Safety guidelines and instruction manuals Please read the safety guidelines and instructions manuals for your own safety and for the safety of other person atten tively and completely prior to the start of installation Please keep the manuals and hold them for disposal Please contact your REHAU sales office in case that safety guidelines or certain installation steps are not understood or are unclear Disregarding of safety guidelines might cause property damage or personal injury Intended use The room temperature controllers Nea and the other components of the system may only be planned installed and operated as described in the documents that accompany the products in the current technical information this service manual Any other use is not intended and therefore not allowed 5 o O Z o Observe all applicable national and international laying installa tion accident prevention and safety regulations when installing the system and observe the notes of the technical information Areas of use not dealt with in this technical information special applications require consultation with our applications depart ment Please contact your REHAU sales office Page 3 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Personnel requirements Allow only officially authorized professional companies and trained persons to assemble our systems Work on electrical systems or cabling may
13. TUR CONTROLLER NEA 230V 24V 3 2 Wiring of room temperature controllers Nea H Nea HT to wiring centre Nea H 230 V 24 V wiring centre Nea 230 V AC L N Nea H HT 24V AC Fig 3 2 Wiring of room temperature controllers Nea H Nea HT to wiring centre Nea H 230 V 24 V Comment The connection of the reduced mode signal clock symbol is optional The wiring centre Nea provides 2 time switch signals A and B Each controller can be assigned to one of the time switch signals The time switch signals of the wiring centre are generated by timer Nea 2 channel weekly timer Triggering of reduced mode Energy saving Nea H The external time switch signal is only valid when the operating mode time switch program is activated by the control buttons of the con troller When the controller is in normal operating mode or in reduced operating mode the external signal is void Nea HT The same as for controller Nea H is valid but in operating mode time switch program the mode normal reduced defined by the internal time switch program is overwritten by the external signal Force of reduced mode See also parameter PE20 Copyright by REHAU Page 11 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 3 3 Wiring of room temperature controller Nea H and Nea HT without use of wiring centre L L1 N L2 Fig 3 3 Wiring of room temperature controller Nea H and Nea HT without use of wiring centre Note
14. U Page 8 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Actuator Operating voltage 230 V AC 10 10 50 60 Hz 24 V AC 20 10 0 60 Hz Operating power Closing and opening times approx 3 min Actuator power 100 N 5 Degree class of protection IP 54 II Connecting cable 2 x 0 75 mm 1m Copyright by REHAU Page 9 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 3 Installation 3 1 System structure Fig 3 1 System structure control system Nea 1 Room temperature controller Nea 2 Wiring centre Nea 3 Actuators 4 Timer 5 Remote temperature probe The room temperature controllers Nea the thermal actuators and optional the timer Nea are connected to the wiring centre Nea The wiring centre Nea offers a safe and clear wiring of the system in the manifold cabinet The wiring centre allows up to 6 room temperature controllers and a maximum number of 12 actuators to be connected For the central control of the setback times the timer Nea can be used as an option A remote temperature probe can be connected to the controllers Nea HCT G oo Only wiring centres Nea HC and room temperature controllers Nea HCT may be used in heating cooling applications A mixed use of room temperature controllers Nea HCT together with room temperature controllers Nea H or HT is not possible Copyright by REHAU Page 10 of 30 SERVICE MANUAL ROOM TEMPERA
15. V 24V 3 5 Wiring of room temperature controllers Nea HCT without use of wiring centre Nea HC 24 V heating cooling Fig 3 5 Wiring of room temperature controllers Nea HCT without use of wiring centre Nea HC 24 V Comment The signal for reduced mode and the signal for cooling mode have to be potential L1 The signal for reduced mode may be generated by a timer or by a switching contact common or for each controller separate a In installations with more than one feed in of operating voltage e g several manifolds and therefore several wiring centres phase equality must be observed as soon as there is any electrical connection between the groups of control systems Copyright by REHAU Page 14 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 3 6 Use of dew point monitors Dew point monitors must be fixed at the coldest point of the flow pipe Ensure that the dew point monitor DPM is in sufficient contact with the ambient air The DPM is installed as an opening contact in the line to the actuators so that the activation is interrupted in case of condensation 230V AC Fig 3 6 Use of dew point monitors Comment The diagram shows the dew point monitor TPW The maximum power consumption of the TPW is 1 VA Because of this the power supply 24 V of the wiring centre can be used The switching capacity of the TPW is 24V 1A and therefore sufficient for 5 actuators Copyright by REHAU Page 15 of 30
16. able change of operating mode PS03 Enable OFF mode PS04 Enable Party presence function PS05 Enable change of time switch program PS06 Enable clock setting PS07 Enable date setting PS08 Enable holiday mode PS09 Activation key lock PS10 Temperature unit C F PS11 Clock format 24h 12h PS12 Display light mode Comment Defines whether temperature set point can be changed by control buttons Defines whether operating mode nor mal reduced time switch program Off can be changed by control buttons Defines whether the controller can be set to OFF mode 0 Party presence function blocked 1 presence function enabled 2 Party function with free choice of duration enabled 3 Party function with choice between 30 60 90 120 300 minutes enabled preset 60 min Defines whether the preset timing program is allowed to be changed Defines whether clock can be set Defines whether date can be set Defines whether holiday function can be enabled Keys are locked after 30 min lock is shown on display when any key is pressed See note 1 how to release keys temporarily ON Display in C OFF Display in Fahrenheit ON 24h Format OFF 12h Format AM PM 0 Off 1 permanent on 2 Auto on by key press automatic switch off with delay 1 Press all 3 keys at the same time for about 3 seconds enter password 410 Key lock will be overruled for 30 min in this time frame parameter PS09 can be set b
17. able start optimization PE14 Room temperature set point in holiday mode PE15 Enable frost protection PE16 Enable valve exercise PE17 Function of external temperature probe PE18 Lower limit floor tem perature PE19 Upper limit floor tem perature Copyright by REHAU Comment The control behaviour will be adapted to the room temperature conditions in certain time periods See also chapter 7 The start of the heat up phase after reduced mode will be optimized See also chapter 7 Room temperature set point in holiday mode This set point is only valid in heating mode during holiday mode cooling function is blocked Enables the frost protection function The frost protection function of the controller will be activated e g in operating mode OFF When frost protection is activated error message with code Fr is displayed The output signal for the actuator is activated once per week for 5 min 0 not connected 1 floor temperature probe for minimum and maximum value monitoring minimum value valid for cooling maximum value for heating 2 floor temperature probe for minimum and maximum value monitoring minimum value valid for cooling and heating maximum value for heating 3 External room temperature probe room temperature control only by this value 4 External floor temperature probe floor temperature control 5 External room temperature probe room temperature control by mean value of ex terna
18. ack Copyright by REHAU Default ON ON OFF ON ON ON ON OFF ON ON Min value OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF Max Nea Nea Nea value H HT HCT ON V4 V4 V4 ON V4 V4 V4 ON V4 3 ON V4 V ON V4 V ON V4 V4 ON V4 V4 ON V VV Vv ON V VV Vv ON Page 19 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Para meter PS13 PS14 PS15 PS16 PS17 PS18 PS19 PS20 PS21 PS22 PS23 Description Automatic accep tance of changed values Set point heating reduced mode Set point heating normal mode Set point cooling normal mode Set point cooling reduced mode Resolution of set point and actual value reading Calibration of internal temperature probe Calibration of external temperature probe Actual value of exter nal temperature probe State of switching output Number of connected actuators Copyright by REHAU Comment ON Changed values will be accepted when Enter Exit Key is pressed and after 5 sec OFF Changed values will be accepted only when Enter Exit Key is pressed If not the input will be cancelled Room temp set point for heating mode in reduced mode C Room temp set point for heating mode in normal mode C Room temp set point for cooling mode in normal mode C Room temp set point for cooling mode in reduced mode C 0 values will be displayed with 1K reading 1 0 5K reading 2
19. be above upper limit Temperature of cooling medium to high Flow rate of cooling circuits to low Cooling power systemic not sufficient lf configured measured value of floor tempera ture probe below lower limit Temperature of heating medium to high Actuator defective wrongly assigned or im proper connected lf configured measured value of floor tempera ture probe below lower limit Heat cooling power not constant Improper parameterization of Nea controller Flow temperature to low lf configured measured value of floor tempera ture probe above lower limit Action Increase flow temperature Check hydraulic balancing Increase room temperature set point to maximum value check whether actuator opens the valve Check cabling Check parameter PE12 Note Optimization function needs some time Check whether displayed value PS21 and set point is realistic Maybe the floor tem perature probe is located in an area where heat distribution is low e g below a car pet Check control of flow temperature Check hydraulic balancing Check whether additional cooling is possi ble using shading system Check whether displayed value PS21 and set point is realistic Maybe the floor tem perature probe is located in an area where heat absorption is low e g below a carpet Reduce flow temperature Decrease room temperature set point to minimum value check whether actuator opens the valve Check cabling Ch
20. buildings with 3 phase AC supply the 3 phases are split up in different parts of the building for the room temperature control system a common power supply has to be used Puls width modulation PWM Puls Width Modulation PWM is the conversion of an analogue continuous signal e g a control signal 0 100 to a sequence of pulses with a fixed cycle time The length of the pulses is proportional to the control signal In this way the control signal of a continuous controller is con verted to a 2 point control signal On Off Due to the inertia of surface heating systems there is despite the switching on and off a continuous temperature trend The diagram below shows a sequence of pulses corresponding to a control signal of 50 signal 1 In the 2nd example the control signal rises starting from 50 to 75 and then 90 signal 1 Page 29 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Pump logic The pump logic ensures that the pump relay is switched on as soon as one of the room temperature controllers switches on the valve actuator Therefore the pump is only activated when there is a real need to heat or cool Reduced operating mode Reduced operating mode is the activation of a room temperature set point triggered by a time switch program or manually which causes reduced energy consumption In well insulated bui
21. eck whether displayed value PS21 and set point is realistic Maybe the floor tem perature probe is located in an area where heat distribution is low e g below a car pet Check entire system Increase width of proportional band PEO5 or PE06 see chapter 7 proportional band Check setting of cycle time reduce possibly PEO7 Check system Check whether displayed value PS21 and set point is realistic Page 26 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Nr Problem Cause Action Flow temperature below dew point Check flow temperature control air humid ity measurement Increase safety distance of flow temperature to measured dew point Install dew point monitor In cooling mode condensation 6 occurs on manifolds and cooled surfaces Heavy fluctuating air humidity Increase safety distance of flow tempera ture to measured dew point Dew point monitor without function Check function and cabling of dew point monitor Display light deactivated Check parameter PS12 7 No display lighting Controller not energized Check fuse in controller or wiring centre Copyright by REHAU Page 27 of 30 SERVICE MANUAL ROOM TEMPERATURE CONTROLLER NEA 230V 24V 7 Glossary Monitoring of floor temperature Floor temperature monitoring by Nea HCT is done by using an optional external temperature probe used as a floor temperature probe PE17 1 or 2 The limits are fixed in parameters PE18 and PE19
22. et with values which are suitable for most applications If necessary to customize the parame terization please proceed carefully and note down all changes You also have the possibility to reset all parameter and settings back to the factory settings by using parameter PE25 4 2 Operating in service and expert level Access Activate display light by pressing any key and wait 2 seconds Press key and key for about 5 seconds simultaneously until software version occurs Press Enter Exit key on the side Enter password 111 for service level or 314 for expert level using i and Z key Press Enter Exit key on the side to confirm Navigation change of parameters in service expert level Navigate through list of parameters by using and Select parameter to be changed with Enter Exit key on the side The value to be changed flashes Value can be changed within the input limits using the Confirm the value with Enter Exit key on the side key and keys Leave service or expert level by pressing quickly Enter Exit key twice double click Copyright by REHAU Page 18 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 4 3 Service level Access with password 111 Para Description meter PS01 Enable set point change PS02 En
23. hort circuit of remote tem Er3 perature probe Er4 Room temperature probe out of range Interruption of room tempera Erd ture probe Short circuit of room tempera Er6 ture probe Copyright by REHAU Comment Frost protection function has been activated because room temperature is below 5 C Measured value is out of allowed range from 30 to 50 C Probe defective or cable interrupted Probe defective or short circuit on cable Measured value is out of allowed range from 30 to 50 C Internal probe defective Internal probe defective Action Ensure heating possibly close windows Check probe and cabling Check probe and cabling Check probe and cabling Check whether controller is disposed to improper temperature influences Replace controller Nea Replace controller Nea Replace controller Nea Page 25 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 6 Troubleshooting No Problem Room temperature set point cannot be achieved heating Room temperature set point cannot be achieved cooling Room temperature almost always to high heating 4 Room temperature is oscillating Floor temperature to low in cooling mode Copyright by REHAU Cause Temperature of heating medium to low Flow rate of heating circuits to low Actuator defective wrongly assigned or im proper connected Optimization function is not working correct lf configured measured value of floor tempera ture pro
24. l and internal probe Lower limit of floor temperature valid when PE17 1 cooling mode will be stopped and PE17 2 cooling mode will be stopped in heating mode floor temperature will not fall below this value Upper limit of floor temperature valid when PE17 1 and 2 in heating mode floor tem perature will not exceed this value Default ON OFF ON ON 20 30 Min value OFF OFF OFF OFF Max value ON ON 3 ON ON 37 37 Nea Nea Nea HT HCT V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 Page 22 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V Para Description meter PE20 Enable automatic mode external con trol PE21 Type of connected actuators NC NO PE22 Enable daylight sav ing time PE23 Start of daylight sav ing time PE24 End of daylight saving time PE25 Reset to factory set tings Copyright by REHAU Comment 0 Automatic mode blocked 1 Enable internal time switch program 2 Enable control by time switch input 3 Enable internal time switch program and external signal external signal reduced mode overwrites in operating mode Auto matic the internal time switch program ON Actuators normally opened NO OFF Actuators normally closed NC ON Automatic switching to daylight saving time OFF No daylight saving time Hour week of month and month of switching to daylight saving time Format hh ww mm The inpu
25. ldings however the temperature is going down very slowly when heating power is reduced On the other hand it is a fact that in case the heating power is well adapted to the energy demand of the building during heat up phase the temperature is rising very slowly Because of this the set point for reduced mode has to be chosen suitable in well insulated buildings a set back value of 2K is appropriate The same applies for the cooling mode whereas effective cool ing power is often lower than heating power Valve exercise Valves which are not activated for a long time might stick To prevent this the valve actuator switched on once a week for 5 minutes when valve exercise PE16 is enabled Copyright by REHAU Page 30 of 30
26. s 4K the output signal at set point is as predefined in parameter PE08 50 The actual room temperature is roundabout 1K above set point the output signal is approx 25 Page 28 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V The diagram below shows the situation with the same room temperature set point and the same actual value however only with modified parameter PE08 75 cul Heating signal output 50 room temperature actual room temperature room temperature setpoint Here the result of the controller output signal is 50 The diagram below shows the effect when the width of the pro portional band is reduced PE05 2K Under otherwise constant conditions the output signal is reduced to 25 Because of this the controller has a stronger response to a deviation from set point when the width of the proportional band is reduced Output signal 100 output 25 room temperature actual room temperature room temperature setpoint Copyright by REHAU Phase coincidence If more than 1 wiring centre Nea is used in a building and it is planned to switch the controllers by a common signal to reduced mode it is not allowed to connect the wiring centre with the existing plug to mains In this case the connection to mains must be done in a fixed way In this case it has to be noted that all wiring centres are con nected to the same live phase Because in
27. t is done in 3 sequentially screens Comment Week 5 means that the last sunday of the month is selected hour week of month and month of switching back to normal time Format hh ww mm The input is done in 3 sequentially screens Comment Week 5 indicates that the last sunday of the month is selected After selecting YES all default settings are loaded and the controller restarts Default OFF ON 02 05 03 03 05 NO Min value 0 OFF OFF 00 01 01 00 01 01 NO Max value 3 ON ON 23 23 YES Nea Nea Nea HT HCT V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 V4 Page 23 of 30 SERVICE MANUAL ROOM TEMPERATUR CONTROLLER NEA 230V 24V 4 5 Special functions Display of output state The state and effect of the output for the actuator is monitored on the controller display by the symbols and ee Output is active controller is heating oe Output is active controller is cooling The state of the output is also shown in parameter PS22 Switching between heating and cooling mode using input keys The switching between operation modes heating and cooling is normally triggered parameter PE10 by the provided CO input This ensures that all controllers follow the demand heating or cooling by a superordinate system or operation lf this method is not possible due to the existing cabling situation manual switching is possible after changing parameter PE10 to
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