After power-up, all LCD segments light up for about 3 seconds. Afterwards, the unit starts in Normal mode to display the current room temperature, user navigation icons and status of the application according to the factory settings. Then the unit is ready for commissioning by qualified HVAC staff.
The control parameters of unit 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., Y11, Y12), 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 unit has an internal sensor or external sensor connected via X1 for accurate temperature display. If the temperature display is influenced by its installation location, calibrate the sensor via parameter P13 to adjust the readings.
Setpoint and range limitation
For comfort and to save energy, we suggest to review all setpoint related parameters and adapt them as needed.