PCB for installation in the control unit.
Using the extension allows the following functions to be achieved:
- External extractor interlock, or alternatively, one of the following functions:
- Connection of a DHW circulation pump (only with Vitotronic 200)
- Connection of a heating circuit pump (stepped) for a directly connected heating circuit
- Connection of a central fault message facility
- Connection of a circulation pump for cylinder heating
Note: Not compatible with Vitodens 200-W EM Plusbus