Watts 20425 User Manual
USER GUIDE
GB
INSTALLATION PARAMETERS MENUS
Dual Sensing Digital Thermostat 230Vac WFHT 041 (20425)
MODES DESCRIPTION
-
Electronic thermostat with LCD display mode for water floor heating
systems controlled by actuators.
- External
pilot
wire
for night reduction.
-
Three Functioning modes: Comfort, reduction or Clock mode.
-
Possibility to regulate either the floor or room temperature, or combined
(in this case, the floor sensor is used as temperature limiter)
-
Silent (triac output), to be connected directly to actuators (see connecting
drawing on the installation sheet) or to our Modular connecting system.
(In this case please refer to the connecting box datasheet)
PPL IMP 1111A
Measured temperature precision
0.1°C (or 0.2°F)
Operating temperature
0°C - 50°C (or 32°F – 122°F)
Setting temperature range
5°C - 37°C by 0.5°C step
(or 41°F - 99°F by 0.5°F step)
Regulation characteristics
Proportional Integral regulation (adjustable see installation
menu) Cycle: 15 minutes or
Static differential 0.3°K
Anti-short cycle: 3min in OFF, 2min in ON.
Electrical Protection
Class II - IP30
Power Supply
230 VAC +/- 10%
Output
TRIAC output 230 VAC, 75 W max.
( 15 actuators WATTS 22C type)
External Floor sensor
NTC (10K Ohms) 3m
TECHNICAL CHARACTERISTICS
DISPLAY
Press the OK key during 5 seconds,
Then use + or - keys to select the installation parameter to be adjusted.
Press OK to toggle the parameter setting or edit the value. If the value starts to blink you can use + / - keys to adjust
this value. Press + & - keys at the same time to reset this value to the factory default value. Once you have adjusted
the value press OK to validate this parameter value.
When you have finished, use + / - keys to go to ‘End’ display and then press OK key to exit installation parameter
menu.
J0 : °C / °F temperature display selection
J1 : “Hot” / “Cold” regulation mode. Select Hot for a Heater system, select Cold for a Cooling system
Cy :
Proportional Integral regulation time cycle value in minutes (default: 15 minutes cycle)
bp :
Proportional Integral regulation band amplitude value in degrees °C/°F (default: 2.0°C/3.6°F)
J4:
“NC” or “NO” Normally closed or normally open actuators selection.
J5 : Select
“PMP” to perform an 1 minute exercise everyday (if installation inactive during a day)
J6 : Air or Floor temperature regulation selection. (if no Floor sensor, regulation will use Air sensor)
J7 : “rEG” (Proportional Integral) or “HYs” (0.3°K Hysteresis) regulation type selection
Cp :
compensation value in °C/°F (default: 2.0°C/3.6°F) this parameter must be adjusted by a professional.
Ao :
Air sensor offset adjustment (default: no offset). Display measured Air sensor value
Fo :
Floor sensor offset adjustment (default: no offset). Display measured Floor sensor value
FL :
Floor temperature LOW limitation (default: 5°C/41°F), effective only if floor sensor present
FH :
Floor temperature HIGH limitation (default: 28°C/82°F) , effective only if floor sensor present
CLr : Press
OK key during 5s to reset all the WFHT LCD parameters to factory defaults
End : Press
OK key to exit installation parameter menu and return to normal operation
* (Default parameters are underlined.)
COMFORT operating mode:
Force comfort temperature operation
indefinitely.
By pressing +/- keys the comfort
temperature starts to blink and can be
adjusted.
The measured temperature
reappears after a few seconds.
OFF mode:
Use this mode if your Heating
installation needs to be turned OFF.
The display is blank.
(Careful in this mode your installation
can freeze)
Parameters are saved.
REDUCED operating mode:
Force reduced temperature operation
indefinitely.
By pressing +/- keys the comfort
temperature starts to blink and can be
adjusted.
The measured temperature
reappears after a few seconds.
External PILOT WIRE mode:
The Thermostat will follow the external
PILOT WIRE signal.
Blinking for indicate a comfort signal.
Blinking for indicate a reduced signal.
Use OK key to change the mode in the Operating mode menu
1: Operating mode menu.
2: Heating indication.
3: Cooling indication.
4: If symbol is displayed the measured temperature
is shown (position 5)
5: Measured temperature or set temperature.
6: °C or °F indication.
7: Title for installation Parameters (J0,CLr…)
7
6
5
1
2
3
4