Hi i am trying to wire the receiver of the honeywell cmt921 to my worcester 28i, but the wiring diagram do not seem to be clear, please can someone tell me how this has to be wired? thanks.
The boiler always needs a feed from the spur to the L and N terminals.
You can either feed the receiver from the boiler (Ls to L and Ns to N), as I have shown, or you can fed it direct from the spur; it just depends which is more convenient.
In both cases you need the link from L to A at the receiver and a wire from B to Lr.
cheers, however im 99% certain i tried that method,and it still wouldnt work, the receiver lights up when the programmer is switched on to manual or the when timer kicks in but it doesnt start the boiler up ??
cheers, however im 99% certain i tried that method,and it still wouldnt work, the receiver lights up when the programmer is switched on to manual or the when timer kicks in but it doesnt start the boiler up ??
ok will check tomorrow night when im next at the house, how can i check the voltage on the reciever without the front on though? as the front has the circuit board built in?
You can check the voltage between L & N and between A & N with the front removed. It's only the voltage between B & N which is the problem as the terminals can only be accessed when the front is off.
You could connect short lengths of wire to B & N which comes outside the box and attach your meter to them. But be very careful as the wire from B should be live when the relay is on.
Just like to say thanks for your help, it ended up being a damaged core in the flex. no idea how that happened as its a first that i know about from a core(blue) to break...strange, anyway boiler is up and running, thanks again for your help/guidance.
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