Rehau NEA Service Manual
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Rehau NEA Service Manual

Room temperature controller 230v / 24v
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SERVICE-MANUAL
NEA ROOM CONTROLLER 230V / 24V
SERVICE-MANUAL
ROOM TEMPERATURE CONTROLLER NEA 230V / 24V
© REHAU
2

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  • Page 1 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V SERVICE-MANUAL ROOM TEMPERATURE CONTROLLER NEA 230V / 24V © REHAU...

  • Page 2: Table Of Contents

    Wiring of NEA HCT room controllers to NEA HC 24V wiring centre ......

  • Page 3: Information And Safety Guidelines

    This service manual is designed to provide additional information Any other use is not intended and therefore not allowed. 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.
  • Page 4 - Only use the intended components for the respective REHAU system. The use of components or tools from other companies which are not from the respective REHAU installation system can lead to accidents or other dangers.

  • Page 5: System Description

    Wiring centre for room temperature controllers, actuators and 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...

  • Page 6: Functional Overview

    SERVICE-MANUAL ROOM TEMPERATURE CONTROLLER NEA 230V / 24V Functional overview NEA H NEA HT NEA HCT Heating    Cooling  Temperature reduction by internal time switch programme   Temperature reduction by external “Timer NEA” possible  ...

  • Page 7: Technical Data

    SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Technical data NEA Room Controller NEA 230 V NEA 24 V Front plate white (RAL 9016); Colour Back cover anthracite grey (RAL 7016) Operating voltage 230 V, AC ±10 % 24 V, AC -10% / +20% Max.
  • Page 8 SERVICE-MANUAL NEA ROOM CONTROLLER 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...
  • Page 9 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Actuator Actuator 230 V Actuator 24 V Operating voltage 230 V, AC +10%... -10%, 50/60 Hz 24 V, AC, +20% … - 10%, 0 - 60 Hz Inrush current 300 mA for max. 200 ms 250 mA for max.

  • Page 10: Installation

    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! © REHAU...

  • Page 11: Wiring Of Nea H And Nea Ht Room Controllers To Nea H 230V / 24V Wiring Centre

    Fig. 3-2 Wiring of NEA H and NEA HT room controllers to NEA H 230 V / 24 V wiring centre Comment: The connection of the reduced mode signal (clock symbol) is optional. The NEA wiring centre provides 2 time switch signals (A and B). Each controller can be assigned to one of the time switch signals.

  • Page 12: Wiring Of Nea H And Nea Ht Room Controller Without Use Of Wiring Centre

    230V 24V 230V 24V optional Fig. 3-3 Wiring of NEA H and NEA HT room controller without use of wiring centre Note: 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 separate controller).

  • Page 13: Wiring Of Nea Hct Room Controllers To Nea Hc 24V Wiring Centre

    Blocking of cooling mode is done by parameter PE9. It is not provided to connect NEA H or NEA HT room controllers to a NEA HC 24V wiring centre. These controllers are only designed for installations with solely heating mode and would have to be blocked in cooling mode by additional actions.

  • Page 14: Wiring Of Nea Hct Room Controllers Without Use Of Nea Hc 24 V Wiring Centre

    NEA ROOM CONTROLLER 230V / 24V Wiring of NEA HCT room controllers without use of NEA HC 24 V wiring centre Fig. 3-5 Wiring of NEA HCT room controllers without use of NEA HC 24 V wiring centre Comment: The signal for reduced mode and the signal for cooling mode have to be potential L1.

  • Page 15: Use Of Dew Point Monitors

    SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V 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.

  • Page 16: Wiring Of Nea Timer To Nea Wiring Centre

    Please note that it is absolutely required to connect terminals 2 and 5 of NEA timer to the wiring centre in the shown way! When terminals 3 and 6 of NEA timer are used, programming of the timer has to be done in such a way, that time periods with normal mode are ON, the time periods with reduced mode are OFF.

  • Page 17: Wiring Of A Pump To Nea Wiring Centres With Pump Module

    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 NEA wiring centres with option “pump module”. © REHAU...

  • Page 18: Parameterisation And Special Functions

    Parameterisation and special functions Introduction All parameters of the NEA room controllers are preset with values which are suitable for most applications. If necessary to customise the parameterisation, please proceed carefully and note down all changes. You also have the possibility to reset all parameters and settings back to the factory settings by using parameter PE25.

  • Page 19: Service Level

    SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Service level Access with password Para- Description Comment Default Min.- Max.- meter value value PS01 Enable set point Defines whether temperature set point can be    change changed by control buttons...
  • Page 20 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Para- Description Comment Default Min.- Max.- meter value value PS13 Automatic ON: Changed values will be accepted,    acceptance of when Enter/Exit Key is pressed and after changed values 5 sec.

  • Page 21: Expert Level

    SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Expert level Access with password Para- Description Comment Default Min.- Max.- meter value value PE01 Minimum value for set Minimum value for set point heating    point heating selectable in user level [°C]...
  • Page 22 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Para- Description Comment Default Min.- Max.- meter value value PE12 Enable optimisation The control behaviour will be adapted to the    function room temperature conditions in certain time periods See also section 7...
  • Page 23 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Para- Description Comment Default Min.- Max.- meter value value PE20 Enable automatic 0: Automatic mode blocked    mode / external 1: Enable internal time switch programme control 2: Enable control by time switch input 3: Enable internal time switch programme and external signal (external signal “reduced...

  • Page 24: Special Functions

    If permanent removal of key lock is wanted during this time parameter PS09 can be reset. Connection of more than 1 actuators to NEA 24 V controller If more than 1 actuator is connected to a NEA 24 V controller the number of actuators has to be inserted in parameter PS23 (only NEA 24V).

  • Page 25: Error Messages

    SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Error messages Description Comment Action Frost protection function has been activated Ensure heating, possibly close windows Frost protection because room temperature is below +5°C Remote temperature probe out Measured value is out of allowed range from...

  • Page 26: Troubleshooting

    SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Troubleshooting Problem Cause Action Temperature of heating medium too low Increase flow temperature Flow rate of heating circuits too low Check hydraulic balancing Actuator defective, wrongly assigned or Increase room temperature set point to improper connection maximum value;...
  • Page 27 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V Problem Cause Action Flow temperature below dew point Check flow temperature control, air humidity measurement. Increase safety distance of flow temperature to measured dew point. Install dew point monitor. In cooling mode condensation...

  • Page 28: Glossary

    Monitoring of floor temperature characterises the control behaviour of a proportional controller. Floor temperature monitoring by NEA HCT is done by using an The output signal of the controller descends from 100% optional external temperature probe, used as a floor temperature beginning from one end of the proportional band to 0% on the probe (PE17 = 1 or 2).
  • Page 29 The diagram below shows the situation with the same room temperature set point and the same actual value, only with If more than 1 NEA wiring centre is used in a building and it is modified parameter PE08: 75% planned to switch the controllers by a common signal to reduced...
  • Page 30 SERVICE-MANUAL NEA ROOM CONTROLLER 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.
  • Page 32 SERVICE-MANUAL NEA ROOM CONTROLLER 230V / 24V © REHAU...

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