Danfoss FH-CWD User manual

Instruction
FH-CWD Thermostat

Instruction FH-CWD Thermostat
2VI.CU.B2.02 Produced by Danfoss Floor Heating Hydronics 05.2011
1. Functional Overview ................................................ 3
2. Mounting ..................................................................... 3
3. Installation ................................................................... 4
4. General usage............................................................. 4
5. Choosing room temperature control or
both room and floor temperature control ....... 5
6. Maximum floor temperature protection .......... 6
7. Frost protection ......................................................... 7
8. Error messages ........................................................... 7
9. Technical Specifications .......................................... 8
10. Figures and illustrations ......................................... 12
Index
IMPORTANT!
Protect the thermostat from dirt, fluids, concrete and do NOT
insert any objects into it.
Do not cover the thermostat, for instance by hanging towels
directly in front of it.
Installation must be done by an authorized electrician.

Instruction FH-CWD Thermostat
3
Produced by Danfoss Floor Heating Hydronics 05.2011 VI.CU.B2.02
1. Functional Overview
Front - fig. 1
 Push button
 Push button M
 Up/down selectors
Back - fig. 2
Screw hole for flush mounting 
Terminals for cable mounting 
Symbols in the display - fig. 3
Room Sensor
Floor Sensor
Temperature indication
Set Room temperature
Set Floor temperature
Floor heating – Active
Frost Protection – Active
2. Mounting
! Wherever possible, the room thermostat should be
installed where the effects of sunlight, draught, and
other heaters (eg. TV’s), etc. are avoided.

Instruction FH-CWD Thermostat
4VI.CU.B2.02 Produced by Danfoss Floor Heating Hydronics 05.2011
3. Installation
Installing the Room Thermostat- fig. 5 and fig. 6
• Remove the connection cable between front and
back part.
• Connect the thermostat correctly to mains supply
according to the Wiring Diagram - fig 6.
• Mount the thermostat by using the enclosed
screws to the wall box.
• Mount the front correctly.
Wiring Diagram – fig. 6
The product must be connected to the following
leads:
• Term L: Phase (L) AC85-250V, 50/60 Hz
• Term NO: Valve (NO)
• Term NC: Valve (NC)
• Term N: Neutral (N)
• Term 2: Empty
• Terminal S2: Floor sensor
• Terminal S1: Floor sensor
4. General usage
Turn ON/OFF the Room Thermostat Fig. 1 
• Turn the thermostat on or off by pressing .

Instruction FH-CWD Thermostat
5
Produced by Danfoss Floor Heating Hydronics 05.2011 VI.CU.B2.02
Display of Room Temperatures - fig. 3
• The actual room temperature is shown in the display
as default .
Setting of Room Temperature Fig. 1 
• Press the to set the desired room temperature
value, is shown in the display.
• When releasing the selector the display returns
to actual room temperature .
5. Choosing room temperature
control or both room and floor
temperature control
Turn OFF the thermostat by pressing Fig. 1 .
• Press and hold Fig. 1  for 10 seconds. The display
will show 01.
• Press Fig. 1  to adjust desired controltype.
01=room temperature control, only with room
sensor, no floor sensor, check and setting only room
temperature.
02=both room and floor temperature control, with
room sensor and floor sensor, check and setting room
temperature and maximum floor temperature limit.
Factory setting is 01.

Instruction FH-CWD Thermostat
6VI.CU.B2.02 Produced by Danfoss Floor Heating Hydronics 05.2011
6. Maximum floor temperature
protection
The function allows you to set a maximum allowable
floor temperature if for instance you want to protect
real wood floors from damage due to excess heat. For
specific maximum floor temperatures please refer to
recommendations from floor suppliers.
Displaying the Floor Temperature
The function allows you to check the internal tem-
perature of the floor. Works only with floor sensor.
Turn ON the thermostat by pressing Fig. 1 .
• Press M Fig. 1  shortly and will flash in the
display.
• The actual floor temperature is shown in the display.
Setting maximum floor temperature
Turn OFF the thermostat by pressing Fig. 1 
• Press M Fig. 1  for 5 seconds until the display
shows .
• Release M Fig.1 , and the display shows .
• Press or Fig. 1 to set the desired maximum
floor temperature limit.
• Wait 5 seconds for the thermostat to exit SET mode
and power off.

Instruction FH-CWD Thermostat
7
Produced by Danfoss Floor Heating Hydronics 05.2011 VI.CU.B2.02
7. Frost protection
Using the Frost Protection Mode instead of turning
the thermostat OFF completely may protect against
damages due to low temperatures. The room tem-
perature will be maintained around 5 °C.
• Turn OFF the thermostat by pressing Fig. 1 .
• Press M Fig.1  for 3 seconds and release.
• Select 01 (00= disabled).
If the room temperature is lower than 5 °C the heating
will be turned ON and will be shown in the display.
If the room temperature is higher than 7 °C the heating
is turned OFF.
Factory setting is 00.
8. Error messages
E1 will be displayed when room sensor failure.
E2 will be displayed when floor sensor failure. E2
will be read when pressing M Fig. 1  to check floor
temperature.
Any case, all relay output would be turned off.

Instruction FH-CWD Thermostat
8VI.CU.B2.02 Produced by Danfoss Floor Heating Hydronics 05.2011
9. Technical Specifications
Feature Description
Approval CE Marking, EN 60730
Colour White RAL 9016
Dimensions 86 x 99 x 19mm
Adjustment mode Push buttons
Programmable No
Fault indication/
failure mode
If room sensor failure, E1 will
be displayed. If floor sensor
failor, E2 will be displayed.
In any case, thermostat will
turn off all output of relays.
Frost protection Yes, if enabled:
< 5 °C heating on
> 7 °C heating off
Ambient
temperature
- 10 °C – 60 °C
Precision ±1 °C
Hysteresis 1 °C, symmetrical around
the setpoint temperature
IP class 30
LCD backlight/
nightlight
Yes

Instruction FH-CWD Thermostat
9
Produced by Danfoss Floor Heating Hydronics 05.2011 VI.CU.B2.02
Feature Description
LCD display Yes
LED indicator No
Max load, inductive <1A
Max load, resistive <3A
Mounting Flush Mounting for Euro-
pean and Chinese built in
sockets.
Network, wire No
Network, wireless No
Off-set function Yes (+/-10 °C)
Power consump-
tion
2 W
Power supply,
battery
No
Power supply, net 85-250Vac 50/60Hz
Power backup
settings
Retains settings in case
of power cut saved on
memory chip
Sensor, floor Optional, 2 terminals (S1,
S2) for external sensor
mounting. Sensor type NTC
10K accuracy: ±1%

Instruction FH-CWD Thermostat
10 VI.CU.B2.02 Produced by Danfoss Floor Heating Hydronics 05.2011
Feature Description
Sensor, floor
- set range
20-45 °C
Sensor, room NTC 100K accuracy: ±1%
Sensor, room
- set range
5-35 °C
Shell material/ non
inflammable
94V0/ Yes
Shell material, type ABS+PC
Static protection Yes