9.8 Additional heat source settings
The heat pump controller is capable of controlling two different types of additional heat sources: the electric heaters of the accumulator and the adjustable additional heat source. The settings can be found in the service menu, under Device settings ► Additional heat. You will only see the settings of the additional heat sources that are set in the hardware configuration.
In Flow temp, you can set the high and low temperature values for the joint supply water. These control the operation of the additional heat sources.
Under Control mode Heat. ele. heater, you can set the control method separately for both additional heat sources to specify how they participate in the heating of the property:
Parallel operation: the additional heat source is started in parallel to the compressor if the compressor’s power or the set temperature is not realised (partially powered system).
HPErr: the additional heat source completely replaces the compressor in the heating of the property in case of, for example, a malfunction.
If both additional heat sources are used, you can specify which one starts first:
- K28-K27: the electric heaters of the accumulator are the primary additional heat source.
- K27-K28: the adjustable additional heat source is the primary additional heat source.