I've just bought a Honeywell programmable room thermostat (CM900) to replace an old Honeywell mechanical room stat. I need some advise on wiring the new one up.
If you are familiar with these then on the old stat there are 3 wires. There is a red wire to terminal 1. Black to terminal 2 and an unsheaved wire to terminal 3.
The new stat wiring diagram shows only 2 cables: live to terminal A and another wire to terminal B from the zone valve (Honeywell powerhead V4073).
So presumably I should put the red wire into terminal A.
What do I put in terminal B??
Any suggestions please.
Cheers
PS If you want the wiring diagrams let me know and I will try to upload them
If you are familiar with these then on the old stat there are 3 wires. There is a red wire to terminal 1. Black to terminal 2 and an unsheaved wire to terminal 3.
The new stat wiring diagram shows only 2 cables: live to terminal A and another wire to terminal B from the zone valve (Honeywell powerhead V4073).
So presumably I should put the red wire into terminal A.
What do I put in terminal B??
Any suggestions please.
Cheers
PS If you want the wiring diagrams let me know and I will try to upload them