My home is 3 zones (2 hot water, 1 steam) and heated with oil. I added a Nest Thermostat E to one of the zones and while it does work without the 'C' wire, I would like to wire it anyways so my relay stops buzzing when the Nest is powering itself. All of my thermostat wires have 3 conductors and since I have no air conditioning here, I believe I can use the unused 'Y' conductor.
I have 2 zone relay valves (Honeywell 8043F1036) and I'm not certain where the common wire is on this relay.
I believe it is either wires 1 or 2 labeled in the picture. The wiring diagrams on Honeywells website aren't clear which terminal is common, or if it is even one of these terminals.
Best Answer
According to the wiring diagram I found, typical wiring is as follows.
You'll have to verify this is how your valve is wired, but it looks just like the diagram to me. If this is how it's wired, you should be able to connect the
c
wire to theTR
(5 in your image) terminal on the valve.