Rehau NEA User manual

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Automotive
Industry
SERVICE-MANUAL
ROOM TEMPERATURE CONTROLLER NEA 23 V / 24V

SERVICE-MANUAL
ROOM TEMPERATURE CONTROLLER NEA 23 V / 24V
Page 2 of 3
TABLE OF CONTENTS
1 . . . . . . .
Information and safety guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
2 . . . . . . . System description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
2.1. . . . . .
System components Nea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
2.2. . . . . . Functional overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
2.3. . . . . . Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7
3 . . . . . . . Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
3.1. . . . . . System structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
3.2. . . . . . Wiring of room temperature controllers Nea H, Nea HT to wiring centre Nea H 23 V / 24V . . . . . . . . . . .
11
3.3. . . . . . Wiring of room temperature controllers Nea H, Nea HT without use of wiring centre . . . . . . . . . . . . . . . . .
12
3.4. . . . . . Wiring of room temperature controllers Nea HCT to wiring centre Nea HC 24V. . . . . . . . . . . . . . . . . . . . .
13
3.5. . . . . . Wiring of room temperature controllers Nea HCT without use of wiring centre . . . . . . . . . . . . . . . . . . . . . .
14
3.6. . . . . . Use of dew point monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15
3.7. . . . . . Wiring of timer Nea to wiring centre Nea . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
3.8. . . . . . Wiring of a pump to wiring centres Nea with pump module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
17
4 . . . . . . . Parameterization and special functions . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
4.1. . . . . . Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
4.2. . . . . . Operating in service- and expert level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18
4.3. . . . . . Service level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
4.4. . . . . . Expert level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
21
4.5. . . . . . Special functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
24
5 . . . . . . . Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
25
. . . . . . . Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
7 . . . . . . . Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
28

SERVICE-MANUAL
ROOM TEMPERATURE CONTROLLER NEA 23 V / 24V
Page 3 of 3
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
Legal information
Important information to be considered
This service manual is an additional and pursuing information for
experts. It is valid for room temperature controllers Nea 23 V
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 download.
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.
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.

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 4 of 3
Personnel requirements
-Allow only officially authorized professional companies and
trained persons to assemble our systems.
-Work on electrical systems or cabling may 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.

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 5 of 3
2. System description
2.1 System components Nea
Room temperature controller Nea H, Nea HT und Nea HCT
Room temperature controller for 23 V AC or 24V AC for the
applications heating and heating / cooling.
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. 2-2 Remote temperature probe Nea
Wiring centre Nea H and Nea HC
Wiring centre for room temperature controllers, actuators and
timer.
Fig. 2-3 Wiring centre Nea H und Nea HC
Timer Nea
2-channel weekly timer .
Fig. 2-4 Timer Nea
Actuator
Thermal actuator with 23 V AC or 24V AC supply voltage,
protection class IP54
Transformer 50VA
Safety transformer 23 V AC/24 V AC according EN 61558,
power 5 VA

SERVICE-MANUAL
ROOM TEMPERATURE CONTROLLER NEA 23 V / 24V
Page 6 of 3
2.2 Functional overview
Nea H Nea HT Nea HCT
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


SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 7 of 3
2.3 Technical data
Room temperature controller Nea
Nea 230 V Nea 24 V
Colour
Front plate white (RAL 9 16);
Back cover anthracite grey (RAL 7 16)
Operating voltage 23 V, AC ±1 % 24 V, AC -1 % / +2 %
Max. switching current ,2 A (resistive load) 1 A (resistive load)
Fuse T ,63 A T 1 A
Safety Class II Class III
Max. number of actuators 5 thermal actuators
Degree of protection IP 3
Frost protection mode 5 °C
Dimensions, front 88 x 88 mm
Dimensions, rear 75 x 75 mm
Depth 26 mm
Storage temperature -2 – 6 °C
Ambient temperature – 5 °C
Application In enclosed spaces
Remote temperature probe Nea
Sensor type NTC 1 K (1 kOhm,1 % at 25 °C)
Cable length 4 m
Protection class IP 67
Timer Nea
Operating voltage 23 V AC
Number of memory locations 84
Power reserve 1 years

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 8 of 3
Nea wiring centre
Nea
w
iring
centre
230 V
Heating
Nea
w
iring
centre
24 V
Heating
,
Heating
und
Cooling
Colour
Lower
housing
and
head section
:
dark grey similar
RAL 7 21;
cover: light grey similar RAL 7 35
Operating
voltage
23
V, AC
24 V, AC
*)
S
witch contact of pump relay
**)
Potential
fre
e, r
ela
y
, 23 V AC: 5A; 24 V DC: 1A
Fuse
T
4
A
H
T
2
A
Safety
Class
II
Class
III
Maximum n
umber
of controllers
6
Max.
n
umber
of
a
ctuator
s
12
therm
al
a
ctuator
s
Number of terminals for
t
iming
programs ***)
2
Degree of protection
IP
2
Frost protection
5 °C
Dimensions
,
H x
W
x L
74
mm
x 4 mm x 3 mm
Ambient
temperature
–
6 °C
Humidity
Max. 8 %,
non
-
condensing
Application
In
enclosed spaces
*) Transformer 5 VA for supply needed
**) only variant with pump relay
***) Timer Nea needed
Transformer 50 VA
Operating
voltage
23 V AC
Output voltage
24 V AC
Power
5 VA
Dimensions
W
x H x
D
68 mm x 7 mm x 75 mm
Other technical
data
S
afety transformer according
EN 61558
Conditionally short-circuit proof with integrated over-temperature protection
Connecting cable (primary side) with moulded-in plug, length 1 cm
Cable on secondary side 3 cm
Mounting plate included, with clipses for mounting rail

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 9 of 3
Actuator
Actuator
230 V
Actuator
24 V
Operating
voltage
23 V, AC
+1 %...
-
1 %, 5 /6 Hz
24 V, AC
, +2 % …
-
1 %,
-
6 Hz
Inrush current
3 mA f
o
r max. 2 ms
25 mA f
o
r max. 2 min
Operating power
1,8 W
Version
Normally closed
(NC)
Closing and opening times
approx.
3 min
Actuator travel
4 mm
Actuator power
1 N
±5 %
Ambient
temperature
…. 6 °C
Degree / class of protection
IP 54/II
Housing
Polyamid
e
/ grey
Connecting cable
2 x ,75 mm², 1 m
Dimensions
W x H x D
44 mm x 58 mm x 47 mm

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 1 of 3
3. Installation
3.1 System structure
Fig. 3-1 S stem structure control s stem 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.
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!
1
2
3
4
5

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 11 of 3
3.2 Wiring of room temperature controllers Nea H, Nea HT to wiring centre Nea H 230 V / 24 V
Nea H / HT
N/L2
L/L1
A
B
230V 24V
L2
L1
N
L
230V 24V
L2
L1
N
L
N/L2
L/L1
A
B
optional
optional
wiring centre Nea
230 V AC
L N
24 V AC
L1 L2
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 PE2 .

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 12 of 3
3.3 Wiring of room temperature controller Nea H and Nea HT without use of wiring centre
Fig. 3-3 Wiring of room temperature controller Nea H and Nea HT without use of wiring centre
Note:
The signal for reduced mode has to be potential L (23 V-systems) or L1 (24V-systems).
The signal may be generated by a timer or by a switching contact (common or for each controller separate).
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!

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 13 of 3
3.4 Wiring of room temperature controllers Nea HCT to wiring centre Nea HC 24 V
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.
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.

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 14 of 3
3.5 Wiring of room temperature controllers Nea HCT without use of wiring centre Nea HC 24 V
Nea HCT, 24V
L2
L1
CO
Nea HCT, 24V
L2
L1
CO
L/L1 N/L2
optional
max 5 !
heating
cooling
optional
optional
optional
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).
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!

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 15 of 3
3. 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.
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.

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 16 of 3
3.7 Wiring of timer Nea to wiring centre Nea
Fig. 3-7 Wiring of timer Nea to wiring centre Nea
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.

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 17 of 3
3.8 Wiring of a pump to wiring centres Nea with pump module
Fig. 3-8 Wiring of a pump to wiring centre Nea with pump module
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”.

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 18 of 3
4. Parameterization and special functions
4.1 Introduction
All parameters of the Nea controllers are preset 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 and - 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 - key
-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 and - keys
-Confirm the value with Enter/Exit – key on the side
-Leave service or expert-level by pressing quickly Enter/Exit – key twice (double click)

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 19 of 3
4.3 Service level
Access with password 111
P
ara
-
meter
Description
C
omment
Default
Min.
-
value
Max.
-
value
Nea
H
Nea
HT
Nea
HCT
PS 1
Enable set point
change
Defines whether t
emperature
set point can be
changed by control buttons
ON
OFF
ON



PS 2
Enable
change of
operating mode
Defines whether operating mode
(
n
o
r-
mal/reduced/time switch program/Off) can be
changed by control buttons
ON
OFF
ON



PS 3
Enable
OFF
-
mode
Defines whether the controller can be set to
OFF-mode
OFF
OFF
ON



PS 4
Enable
Party
-
/
presence - function
: Party
-
/
presence
-
f
unction
blocked
1: presence-function enabled
2: Party-function with free choice of duration
enabled
3: Party-function with choice between
3 , 6 , 9 , 12 , ….3 minutes
enabled, preset 6 min
2
3


PS 5
Enable
change of
time switch program
Defines whether
the preset timing program is
allowed to be changed
ON
OFF
ON


PS 6
Enable
clock setting
Defines whether
clock can be set
ON
OFF
ON


PS 7
Enable
d
at
e setting
Defines whether
date can be set
ON
OFF
ON


PS 8
Enable
holiday mode
Defines whether
holiday function can be
enabled
ON
OFF
ON


PS 9
Activation
key
lock
Keys are locked after
3 min.
(
lock is shown
on display when any key is pressed).
See note *1) how to release keys temporarily
OFF
OFF
ON



PS1
T
emperature unit
(°C/F)
ON:
Display
in °C
OFF: Display in Fahrenheit
ON
OFF
ON



PS11
Clock
format
(24h/12h)
ON: 24h
–
Format
OFF: 12h – Format (AM / PM)
ON
OFF
ON


PS12
Display light mode
:
Off
1: permanent on
2: Auto: on by key press, automatic switch off
with delay
2
2



*1) Press all 3 keys at the same time for about 3 seconds, enter password 41
Key lock will be overruled for 3 min, in this time frame parameter PS 9 can be set back

SERVICE-MANUAL
ROOM TEMPERATUR CONTROLLER NEA 23 V / 24V
Copyright by REHAU Page 2 of 3
Para
-
meter
Description
Comment
Default
Min.
-
value
Max.
-
value
Nea
H
Nea
HT
Nea
HCT
PS13
Automatic acce
p-
tance of changed
values
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.
ON
OFF
ON



PS14
S
et point h
eating
reduced mode
Room temp. set point
for heating mode in
reduced mode [°C]
18
37



PS15
Set point heating
normal mode
Room temp. set point for heating mode in
normal mode [°C]
22
37



PS16
Set point cooling
normal mode
Room temp. set point for cooling mode in
normal mode [°C]
24
37

PS17
Set point cooling
reduced mode
Room temp. set point for
cooli
ng mode in
reduced mode [°C]
26
37

PS18
Resolution of set
point and actual value
reading
:
values will be displayed with
1K reading
1: ,5K reading
2: ,1K reading
1
2



PS19
Calibration of
intern
al
temperature probe
Offset value
fo
r intern
al
r
oom temperature
probe
K
-
5K
+5K



PS2
Calibration of
external
temperature probe
Offset value for external temperature probe
/
floor temperature probe
K
-
5K
+5K

PS21
Actual value of
exte
r-
nal temperature probe
D
isplay of a
ctual
temperature value from
external temperature probe
-
°C
5 °C

PS22
State
of switching
output
The state of switching output
f
o
r
a
ctuator
is
shown (ON/OFF).
Comment:
The state of output is also displayed in end
user level with the „heating“ or „cooling“
symbol.
-
OFF
ON

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PS23
Number
of connected
actuators
Only
24V
-
controllers
:
Number of actuators directly connected to
switching output
1
1
5
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