PDF User Manual

NEA H 24 V & NEA H 230 V

REHAU ROOM THERMOSTAT  
USER INSTRUCTIONS AND QUICK INSTALLATION GUIDE

www.rehau.co.uk

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Safety

Important info 

Your benefit

Scope of supply

Thermostat (1 pc) 

Anchors & Screws (2 pcs) 

Manual (1 pc)

Contents

Scope of supply . . . . . . . . . . . . 30
Introduction  .   .   .   .   .   .   .   .   .   .   .   .   .   .   31
Product compliance and safety   . . . . 31
Safety information . . . . . . . . . . . 31
Installer parameter settings, expert level  32
Mounting position and installation  . . . 33
Removing cover from the Nea . . . . . 39
Thermostat control and display   . . . . 40
Adjusting set temperature  . . . . . . . 42
Operational modes.   .   .   .   .   .   .   .   .   .   .   42
Display messages . . . . . . . . . . . 43
General function information .   .   .   .   .   .   43
Technical data .  .  .  .  .  .  .  .  .  .  .  .  .  44

30

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. 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 EC Directives

 - Electro-Magnetic Compatibility Directive 

2004/108/EC

 - Low Voltage Directive 2006/95/EC

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 

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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:

 - Electrical 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.

32

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
 

For your benefit symbol

To ensure trouble free operation and efficient control. the room thermostat Nea

is best positioned behind a door and at 130cm from the floor.

(Pic)

Do not position the thermostat:

1. Near any heat source (pics)

2. Behind curtains(pic)

3. Direct Sunlight(pic)

4. In a bathroom or area of high humidity(pic)

Info symbol

·         Not to be positioned on exterior wall

·         Do not install the remote sensor (if applicable) in an empty tube

·         Only the temperature at the position of remote sensor (if applicable) is measured

130cm

130cm

For your benefit symbol

To ensure trouble free operation and efficient control. the room thermostat Nea

is best positioned behind a door and at 130cm from the floor.

(Pic)

Do not position the thermostat:

1. Near any heat source (pics)

2. Behind curtains(pic)

3. Direct Sunlight(pic)

4. In a bathroom or area of high humidity(pic)

Info symbol

·         Not to be positioned on exterior wall

·         Do not install the remote sensor (if applicable) in an empty tube

·         Only the temperature at the position of remote sensor (if applicable) is measured

130cm

130cm

For your benefit symbol

To ensure trouble free operation and efficient control. the room thermostat Nea

is best positioned behind a door and at 130cm from the floor.

(Pic)

Do not position the thermostat:

1. Near any heat source (pics)

2. Behind curtains(pic)

3. Direct Sunlight(pic)

4. In a bathroom or area of high humidity(pic)

Info symbol

·         Not to be positioned on exterior wall

·         Do not install the remote sensor (if applicable) in an empty tube

·         Only the temperature at the position of remote sensor (if applicable) is measured

130cm

130cm

For your benefit symbol

To ensure trouble free operation and efficient control. the room thermostat Nea

is best positioned behind a door and at 130cm from the floor.

(Pic)

Do not position the thermostat:

1. Near any heat source (pics)

2. Behind curtains(pic)

3. Direct Sunlight(pic)

4. In a bathroom or area of high humidity(pic)

Info symbol

·         Not to be positioned on exterior wall

·         Do not install the remote sensor (if applicable) in an empty tube

·         Only the temperature at the position of remote sensor (if applicable) is measured

130cm

130cm

For your benefit symbol

To ensure trouble free operation and efficient control. the room thermostat Nea

is best positioned behind a door and at 130cm from the floor.

(Pic)

Do not position the thermostat:

1. Near any heat source (pics)

2. Behind curtains(pic)

3. Direct Sunlight(pic)

4. In a bathroom or area of high humidity(pic)

Info symbol

·         Not to be positioned on exterior wall

·         Do not install the remote sensor (if applicable) in an empty tube

·         Only the temperature at the position of remote sensor (if applicable) is measured

130cm

130cm

For your benefit symbol

To ensure trouble free operation and efficient control. the room thermostat Nea

is best positioned behind a door and at 130cm from the floor.

(Pic)

Do not position the thermostat:

1. Near any heat source (pics)

2. Behind curtains(pic)

3. Direct Sunlight(pic)

4. In a bathroom or area of high humidity(pic)

Info symbol

·         Not to be positioned on exterior wall

·         Do not install the remote sensor (if applicable) in an empty tube

·         Only the temperature at the position of remote sensor (if applicable) is measured

130cm

130cm

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Installation

1

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

2

 Wiring connections

Solid and

stranded wire

max 1.5 mm² square 

A

55 mm

B

8 mm

7 mm*

60 mm

19 mm

75 mm

88 mm

A

B

Wiring connection Nea H 24 V & 230 V

34

Nea H wiring

* Room thermostat Nea H 230 V and 24 V are separate models

Optional External Time Switch

Max. 5 Thermal Actuators

L/L1 N/L2

L1

L2

L

N

24 V

230 V

230 V AC

L         N

24 V AC

L1       L2

230 V AC / 0.2 A

Resistive Load

24 V AC / 1 A

Resistive Load

24 V

230 V

H*

H*

H*

H*

L

N

External time switch (Phase balance)

Load (Thermal Actuators)

Neutral

Phase 

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* Room thermostat Nea H 230 V and 24 V are separate models

Max. 5 Thermal Actuators

Max. 5 Thermal Actuators

Optional External Time Switch

L/L1 N/L2

L1

L2

L1

L2

L

N

L

N

230 V AC

L         N

24 V AC

L1       L2

230 V AC / 0.2 A

Resistive Load

24 V AC / 1 A

Resistive Load

24 V

230 V

24 V

230 V

H*

H*

H*

H*

L

N

External time switch, phase balance 

Load (Thermal Actuators)

Neutral

Phase 

36

* Room thermostat Nea H 230 V and 24 V are separate models

L/L1 N/L2

L1

L2

L1

L2

L

N

L

N

230 V AC

L         N

24 V AC

L1       L2

230 V AC / 0.2 A

Resistive Load

24 V AC / 1 A

Resistive Load

24 V

230 V

24 V

230 V

H*

H*

H*

H*

L

N

External time switch (Phase balance) 

Load (Thermal Actuators)

Neutral

Phase 

WIRING CENTRE

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Ensure that the cable is contained 
within the shaded area.

3

Locate the front cover on rear case, 

ensuring that the hinged clips are located 
first.

Ensure that the two arrows are 
aligned properly before closing.

4

Locate hinge first

20 mm

25 mm

38

5

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

1

Use tool to gently push the cover 

locking clip vertically.

Recommended width 5 mm for tool.

2

Pull the base of the cover assembly 

away from rear case.

3

Remove cover and put in safe place.

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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

A

B

AM

PM

1234567

R

S

F

R

+

-

PM

R

40

LCD icon

Indicator

Description

Explanation

Temperature

Shows the actual room (R) temperature or the set (S) point temperature.
The set point temperature is your required room temperature

R

Room temperature

The displayed temperature is the current room temperature

S

Set point temperature

The displayed temperature is the required room temperature

Heating active

Heating mode is active

Normal mode

Operation mode normal is active 

Reduced mode

Operation mode reduced is active

Time switch program

The thermostat will automatically select operation mode normal and reduced 
based on the external time switch

Lock mode

Protect the room thermostat against unauthorized access

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Adjusting set temperature 

Reducing set temperature

To view the set point temperature only press once 

Operational modes

Selection - Standard thermostat 

1

Normal operation: Default set point 22ºC 

2

Reduced operation: Default set point 18ºC 

3

Auto operation: Only with external time switch 

4

Operational mode off (optional)

When the Nea is set to OFF there is 

automatic frost protection active. If the 

R

S

S

R

1

2

3

4

 or   

or   

R

2

3

4

R

R

1

or   

or   

or   

or   

42

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. To 
accept changes, press  .

Auto - Standard thermostat 

A

Time switch program activ; normal mode

B

Time switch program activ; reduced mode 

Display messages

A

Frost protection is active  

B

Room temperature out of sensor range

Frost 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 

A

B

R

R

R

A

B

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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

230 V-AC +/- 10 % 24 V-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

Degree of protection

IP30

Anfi freeze operation

5 °C

Valve protection function 5 min/week
Dimensions frontside

88 x 88 (mm)

Dimensions backside

75 x 75 (mm)

Depth

26 (mm)

Storage temperature

-20 to 60 °C

Ambient temperature

0 to 50 °C

Relative humidity

Max. 80 %, non condensing

* Resistive load

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.

44

©  REHAU  954609  de/en/cz/es/fr/gr/hu/it/nl/pl/ro/rs/ru/se/tr  04.2013     

www.rehau.com

REHAU AG + Co, Otto Hahn Str. 2, 95111 Rehau, Germany