Fitting Honeywell CM927 to Worcester Greenstar 30 Combi

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Hi Guys,

Just wanted to double check these connections before I install the wireless thermostat.

The Honeywell instructions show T1 and T2 terminal which my boiler doesn't have. So ive done some reading through this forum and come up with this...

I'm guessing I would remove the cable on the right coming into the boiler (existing thermostat?) and leave the cable on the left (mains power for boiler)

From boiler to thermostat receiver...

Ls - L
Ns - N
LR - B

Bridge connections L and A in the thermostat receiver?


Boiler instructions...

Honeywell instructions

current wiring of existing old wired thermostat


Many thanks in advance!!!

Dave
 
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hmm I do, and its wired in currently.
Is it a WB timer, in the boiler case? If so, just set it so the heating is on permanently.

If it's external, just disconnect it and wire the receiver as you proposed.
 
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its an external one. Ill just remove the cable (one on the right of the picture) then.

thanks a lot for you help!
 
First Post said:
the cable on the right coming into the boiler (existing thermostat?)
Latest Post said:
its an external one [(timer]. Ill just remove the cable (one on the right of the picture) then.
I'm confused.

Do you have an existing external timer and thermostat, or just a timer or just a thermostat?
 

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