I have a Nest E thermostat, and like many others have lost wifi and getting low battery because I have no common wire connected.
After looking at my old Lennnox 78ugf3-75-1 furnace, I noticed that my AC Y wire is connected to the Common terminal(called 'T') on my furnace circuit board. Oddly enough, nothing is connected to my Y terminal.
The electrical cable has a green unused wire that I plan to use for my C wire, but before I do that, should I move the Y wire to the Y terminal or leave it on the C terminal? It must have been installed this way years ago as I've never swapped the wires before.