After power-up, the thermostat resets and all LCD segments light up for about 3 seconds. Afterwards, the room temperature is displayed (factory setting) and the unit is ready for commissioning by qualified HVAC staff.

The thermostat’s control parameters can be adjusted to ensure optimum performance of the entire system (see Parameter settings).

Surge protection at power-up

When the thermostats are powered, except all valve outputs (e.g., Q12, Q14), LCD display and key buttons operate normally.

The thermostat outputs start at random to protect the electric system against overload. For all thermostat outputs to work properly requires a short while.

Sensor calibration

The thermostat has an internal sensor for accurate temperature display. If the temperature display is influenced by its installation location, calibrate the sensor via parameter P05 to adjust the readings.

Setpoint and range limitation

For Comfort and to save energy, we suggest to review both setpoints and setpoint ranges (parameters P08...P11, P65) and adapt them as needed.