My new White Rogers programmable furnace stat says it needs 24 v dc to run it.
I installed it and am using the 2 AA batteries to power it, but I have 4 wires coming in now. I have A/C. The stat is running OK now but if I take the batteries out the display goes dead. I don't know how to run 24 v transformer power to this stat. I can fish another wire up to the stat, and I see a transformer behind the furnace at an AC outlet. Should 2 wires go up to the stat? One from trans. Ground, one from + trans. To the RED terminal?
It appears the (now) 4 wires go onto a terminal block just inside furnace chamber. Nothing goes to this transformer which was here when I moved in. I don't want to blow the furnace computer relay.
Can anyone advise?