I have an old Honeywell Q674 thermostat with mercury in the house we just moved into.
I'm attempting to upgrade to the nest 3rd generation thermostat, however the wiring labels are VERY different. I believe I have figured out that:
- R=RH or RC
Does there need to be a jumper from rh to 3rd? Does W2 go to W1?
Amy I do would be helpful. Here are some photos.