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Type: Posts; User: Tom Shea

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    Electrical Connections

    Unfortunately the only electrical connections in terms of control are through F connection (controlling CH and currently being initiated by BDR91) and the OpenTherm connection. I think that the...
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    1,318

    Vitodens 111-W DHW Control

    Good afternoon all,

    Apologies for going around the buoy again on an already discussed topic.

    I have a Viessmann Vitodens 111-W boiler, Honeywell Evohome with BDR91 relay and HR91 TRVs. I work...
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