Wiring thermostat

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Wiring thermostat

Post  TrickyTree1984 on Tue Oct 23, 2012 11:18 am

Hi,

My heating timer is bust, the heating is always on but can still be controlled by the thermostat. To rectify it have bought a honeywell cmt927. I was hoping to straight swap the thermostat I have in the hall (seimens landis & staefa) with the new one.

Has anyone ever wired these? I have a live (brown), black (???), neutral (blue), and earth (yellow and green) coming into the existing box. The instructions for the honeywell don't really make it clear to me. The options I have are N L L A B C

does anyone know which wire goes

TrickyTree1984

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Re: Wiring thermostat

Post  TrickyTree1984 on Tue Oct 23, 2012 11:20 am

Also I am unsure how to isolate without switching the master breaker. Will turning the boiler off isolate it?

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