I have just ordered a Honeywell CM927 Wireless Programmable Room Thermostat for my Worcester Greenstar HE R35 combi boiler. This is an older model boiler from about 7 years ago.
The CM927 wiring diagram shows 2 connections from the stat to the boiler, at the stat end the A terminal goes to T1 on the bolier and B on the stat to T2 on the bolier.
Looking at the wiring diagram for Bosch's own room thermostat for this bolier there are 3 connections, labelled F, 3 and 4 at both the boiler and stat end.
Can anyone tell me how I should wire up the CM927 to this boiler. There is no room thermostat fitted at present.
Thank you
Tim.
The CM927 wiring diagram shows 2 connections from the stat to the boiler, at the stat end the A terminal goes to T1 on the bolier and B on the stat to T2 on the bolier.
Looking at the wiring diagram for Bosch's own room thermostat for this bolier there are 3 connections, labelled F, 3 and 4 at both the boiler and stat end.
Can anyone tell me how I should wire up the CM927 to this boiler. There is no room thermostat fitted at present.
Thank you
Tim.