PCB for installation in the control unit. Using the extension allows the following functions to be achieved: Connection of an external safety solenoid valve (LPG) 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
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