The Efficient Home Forum

Sorry, regarding my question, that should be terminals A and B of the control circuit.

I’ve re-graded my heating system to evohome, works fine at present. There are numerous HR92 controlled radiators plus a single radiator in a separate room that is always live, ie. no thermostat fitted. After fitting evohome, I have a redundant CMS927 controller with its own BDR91. In essence, this ...