Heating & cooling

How does the automatic switchover from the heating to cooling mode work?

Switchover takes place via an external binary contact. This is done via a data point from the building automation system or by detecting the feed temperature.
If the feed temperature is above 25 °C for example, the pump runs in heating mode with the corresponding set control mode.
If the feed temperature is below 19 °C for example, it runs with the corresponding setting.
The pump is idle between 19 °C and 25 °C and runs at short intervals to determine whether cooling or heating is required.
19 °C and 25 °C are the pre-set values, other settings are possible.