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by PrussianBlue
Wed Dec 08, 2010 8:40 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Wiring a room thermostat - CM907
Replies: 8
Views: 29017

Whoops!!! typo. Indeed they are Brown, Grey and Black + earth As you wrote- After checking with my meter-Brown is positive and Grey is the neutral. Black has no brown sleeve (but ok,). I have now connected Brown to A and Black to B and the unit works just fine. It seems that Grey negative is superfl...
by PrussianBlue
Tue Dec 07, 2010 6:14 pm
Forum: Central Heating and Air conditioning and Ventilation Forum
Topic: Wiring a room thermostat - CM907
Replies: 8
Views: 29017

CM907 wiring

Sorry to come back to this issue but I have blue, black and grey wires connecting a combi boiler to my Honeywell T6360B roomstat . I am now replacing the roomstat with a Honeywell CM907. I assume the brown goes to A but what are black and grey wires connecting to at the boiler and which one goes to B?
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