After initial power-up, all LCD segments light up for about 3 seconds. Afterwards, the device enters parameter setting mode and is ready for commissioning by qualified HVAC staff. After commissioning, parameter settings mode is closed, the device restarts and is ready for normal operation.

The device control parameters can be adjusted to ensure optimum performance of the entire system (see Control parameters in Basic documentation).

Applications and settings

The room thermostats are delivered with a fixed set of applications and related parameters. Select and activate the relevant application and settings during commissioning using one of the following tools:

  • Local HMI
  • Modbus commissioning tool

Control sequence

Set the control sequence via parameter P02 depending on the application. Factory setting:


Factory setting (P02)


2 = Cooling only


5 = Heating and cooling

Surge protection at power-up

When the thermostats are powered, the control outputs start at random to protect the electric system against overload. It takes up to 3 seconds for all thermostat outputs to function properly.

Measured value adjustment

The device has an internal sensor for accurate temperature display. If the temperature reading is affected by the installation location, adjust the sensor via parameter P13 to correct the readings.

Setpoint and range limitation

For comfort and to save energy, review all setpoint related parameters and adapt them as needed.

Device address (Modbus)

The device address is assigned to "1" (factory setting). Engineers/installers can change the address value using parameter P93 as needed.

Baud rate

The baud rate is selectable. Four settings are available for the Modbus network: Auto, 9600 bps, 19200 bps and 38400 bps (19200 bps is default).

Modbus data frame format

The Modbus data frame format can be set to 1 = 1/8/E/1, 2 = 1/8/O/1, 3 = 1/8/N/1 or 4 = 1/8/N/2 (1/8/E/1 is default).