"Clever" controller for central heating?
Discussion
Ferg said:
If it's a gravity hot water system the programmer should be set to always heat the water when the central heating comes on. It sounds like the programmer is the wrong type.
I don't recognise that programmer but they usually have a wire link or switch to convert them so they're suitable for either fully pumped (both CH & DHW) or gravity HW systems.The bit about the CH circulating cold water is odd though.
Wired up and all now seems to be working OK. Turned out that the yellow wire was live, the blue neutral and the red was the feed to the boiler.
Yellow is only live when the old controller is calling for heat so I've set it to run continually, with the CM927 taking care of the switching.
Yellow is only live when the old controller is calling for heat so I've set it to run continually, with the CM927 taking care of the switching.
smn159 said:
Wired up and all now seems to be working OK. Turned out that the yellow wire was live, the blue neutral and the red was the feed to the boiler.
Yellow is only live when the old controller is calling for heat so I've set it to run continually, with the CM927 taking care of the switching.
I'm trying to do the same as you've done except I've gone for the CM907 which is the non-wireless version and my yellow and red wires on the existing thermostat are the opposite to yours.Yellow is only live when the old controller is calling for heat so I've set it to run continually, with the CM927 taking care of the switching.
On the new thermostat, did you wire the permanently live to A, the neutral to B and the call for heat to C?
Cheers
Ferg said:
Redmax said:
On the new thermostat, did you wire the permanently live to A, the neutral to B and the call for heat to C?
If you do this it will blow the PCB. Don't get a neutral in it. Make that safe and switch the other two with A and B. Either way around.
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