Watts WFHT 041 (20425) - Dual Sensing Digital Thermostat Manual

PRODUCT OVERVIEW

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)

Use OK key to change the mode in the Operating mode menu

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.

INSTALLATION PARAMETERS MENUS

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.)

DISPLAY

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...)

TECHNICAL CHARACTERISTICS