REHAU NEA H 24 V Room Thermostat Instruction Manual
- June 10, 2024
- REHAU
Table of Contents
REHAU NEA H 24 V Room Thermostat
Product Information
NEA H 24 V & NEA H 230 V Thermostat
The NEA H thermostat by REHAU is designed for use in the construction and automotive industry. It is available in two voltage options, 24 V and 230 V, and can be used for controlling room temperature. The volume of supply includes the thermostat unit and instructions for use.
Product Features
- Two voltage options: 24 V and 230 V
- Designed for use in the construction and automotive industry
- Controls room temperature
Product Safety
The NEA H thermostat complies with product safety regulations. Users should follow all safety guidelines provided in the user manual.
Product Usage Instructions:
Installation:
Install the thermostat in a suitable location according to the installation instructions provided in the user manual. Ensure proper wiring according to the appropriate voltage option chosen.
Operation
- Remove the cover of the thermostat by following the instructions provided in the user manual.
- The thermostat features controls and a display screen for setting the desired temperature.
- Use the controls to set the desired temperature and select theappropriate mode of operation according to the instructions provided in the user manual.
- The display screen will show information about the current temperature and selected mode of operation.
Maintenance
Refer to the user manual for cleaning and maintenance instructions. Do not
attempt to disassemble or repair the thermostat without professional
assistance.
Following these instructions will enable users to effectively use the NEA H
thermostat for controlling room temperature in the construction and automotive
industry.
Your benefit
Insofar as the intended application deviates from that described in the relevant Technical Information brochure, the user must consult REHAU and must receive express written consent from REHAU before commencing this utilization. If the user fails to do so, the sole responsibility for the utilization shall lie with the individual user. In this case, the application, use and processing of products are beyond our control. Should a case of liability arise, however, this shall be limited to the value of the goods delivered by us and used by you in all cases of damage. Claims arising from granted guarantees shall become invalid in the case of intended applications that are not described in the Technical Information brochures
Scope of supply
- Thermostat (1 pc)
- Anchors & Screws (2 pcs)
- Manual (1 pc)
Introduction
Thank you for purchasing the REHAU room thermostat Nea. The Nea H is a
parameter-izable digital room thermostat which is available in 24 V and 230 V
versions and offers simple temperature adjustment of your heating system.
By purchasing one of the REHAU room thermostats Nea you have decided on an
electronic thermostat that allows you to adjust surface heating applications
individually, such as underfloor, wall or panel heating for hotels, residential
and office buildings. Tailor-made single room control can be implemented
depending on system design. A clear energy saving is possible by reducing
temperature.
We hope you enjoy this product.
Product compliance and safety Product compliance
This product is CE compliant and meets the following EU Directives
- Electro-Magnetic Compatibility Directive 2014/30/EU
Low Voltage Directive 2014/35/EU
Safety information
Use in accordance with the regulations.
The room thermostat Nea H is to be used for the room control of hot water
surface systems inside the house and not considered for flow control or flow
control supervision in case of heating or cooling. In this context the Nea H
must be used exclusively to drive thermal actuators. The manufacturer is not
liable for improper use.
Authorized specialists
The electrical installation must be performed according to the current
national regulations as well as according to the regulations of your local
electric power utility company. These instructions require special knowledge
corresponding to an officially acknowledged degree in one of the following
professions:
- Equipment Installer or Electronics Engineer
According to international regulations, as well as according to comparable profes-sions within your specific country law.
Sources of danger
The thermostat must be discon-nected from the mains supply or fuse before
removing the cover.
Emergency
Switch off the voltage to the complete individual room temperature control
system.
Installer parameter settings, expert level
The thermostat Nea is equipped with various parameters. These parameters can
easily be modified for your specific application. See the Nea Service and Expert
Parameters section at www.rehau.com/nea.
Please note that the parameter sections must only be entered by an installer
or competent person. Changing these parameters can have a serious effect on
the heating system.
Please enter any parameter changes in the installer notes section.
Mounting position and installation
To ensure trouble free operation and efficient control. The room thermostat
Nea is best positioned in a draft – free area and at 130 cm from the floor. Do
not position the thermostat near any heat source, behind curtains, direct
sunlight or in an area of high humidity
- Not to be positioned on exterior wall
Installation
Wall mounting
For wall mounting, mark and mount the rear case to the wall. The Nea is
suitable for wall boxes with a center hole distance of 60 mm.
screw head maximum size
Wiring connections Solid and stranded wire
- 230V: 1.5 mm² square
- 24V: 0.75 mm² – 1.5 mm² square
- A 55 mm
- B 8 mm
Nea H wiring
Room thermostat Nea H 230 V and 24 V are separate models
Ensure that the cable is contained within the shaded area.
Ensure that the two arrows are aligned properly before closing
- Locate the front cover on rear case, ensuring that the hinged clips are located first.
- Locate hinge first
- Gently locate the cover locking clip in rear case location and close it.
Ensure cover locking clip is secure in the rear case.
Removing cover from the Nea
-
Use tool to gently push the cover locking clip vertically
Recommended width 5 mm for tool. -
Pull the base of the cover assembly away from rear case
-
Remove cover and put in safe place.
Thermostat control and display
Powering up for the first time
- A After power up, all LCD segments are turned on for two seconds.
- B After initialization the room thermostat will show the standard display
The room thermostat is powering up with the factory default settings. After a
power failure the thermostat will continue the operation mode as it was before
the power failure. This will be up to 15 hours if the unit has been fully
powered for 24 hours.
Installers parameter settings are permanently stored on power failure
Key assignment
- + Decrease temperature. Also back in menu settings
- – Increase temperature. Also forward in menu settings
- Enter / Exit
- Flashing symbols or numbers are changeable
LCD icon
Adjusting set temperature
Reducing set temperature
To view the set point temperature only press once +/-
Operational modes
Selection – Standard thermostat
- Normal operation: Default set point 22ºC
- Reduced operation: Default set point 18ºC
- Auto operation: Only with external time switch
- Operational mode off (optional
When the Nea is set to OFF there is automatic frost protection active. If the temperature falls below 5 ºC the heating valve will be activated
If an external time switch is activated and the clock is displayed then the change in set temperature is temporary. The set point will return to normal / reduced on next time switch program change. If the clock is not displayed, the target value change is permanent
Auto – Standard thermostat
- A Time switch program activ; normal mode
- B Time switch program activ; reduced mode
Display messages
AFrost protection is active
- BEr 4 – Room temperature out of sensor range
- CEr 5 – Interruption of room temperature probe
- DEr 6 – Short circuit of room temperature probeFrost protection display will remain until any key is pressed.
General function information
Valve protection
To protect the valves the output is turned on for 5 minutes in every week.
This function stops the valve from getting stuck due to long periods of
inactivity.
Pulse width modulation
Room temperature control is achieved by opening and closing the circuit
control valves for defined times. The opening time of the valves is determined
by the required energy supply.
PI control
The PI control adjusts the control signal gradually to the demand of the
system, in order to optimize the control result. This optimization must be
applied very cautiously in case of surface heating and cooling.
Cleaning your Nea
Only use a soft, dry, solvent-free cloth for cleaning.A blown fuse can
indicate an error within your system. Before replacing the fuse, the system
must be checked by an authorized specialist
Technical data
| Nea H 230 V | Nea H 24 V*** | |
|---|---|---|
| Operating voltage | 230V-AC+/-10% | 24V-AC+20%-10% |
| Max switch current | 0 2 A* | 1 A* |
| Fuse | 0 63 A T | 1 A T |
| Safety** | Class II | Class III |
| Max no of actuators | 5 x 3 W | |
| Mode of operation | 1 Y | |
| Degreeofcontamination | 2 | |
| Rated impulse voltage | 4 kV | |
| Degree of protection | IP30 | |
| Anfi freeze operation | 5 °C | |
| Valveprotectionfunction | 5 min/week | |
| Dimensions frontside | 88 x 88 (mm) | |
| Dimensions backside | 75 x 75 (mm) | |
| Operating values | 6 37 °C | |
| Depth | 26 (mm) | |
| Storage temperature | -20 to 65 °C | |
| Ambient temperature | 0 to 50 °C | |
| Relative humidity | Max 80 %, non condensing |
- Resistive load
- Following proper installation, the requirements of the protective class will be met.
- For power supply use a SELV-transformer
CA = 0,2K * (Nea H 230V, Water Floor Heating Systems)
see service manual for parametrization
REHAU Industries SE & Co. KG, Otto-Hahn-Str. 2, 95111 Rehau, Germany
www.rehau.com
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