I currently have a Honeywell Thermostat with 4 wires going to a Janitrol Furnace.
I am trying to install a Honeywell WiFi Thermostat RTH6580WF and I'm missing my C wire. My bundle has 8 possible wires, 4 of which are currently being used by the old thermostat (see attached OLD Pic). I went to the terminal block and saw a black screw above the W, G, R terminals.
My question is: can I use the black screw above them as my C Wire? It has 24VAC burned into the board above it, so if my assumptions are correct, I would be fine with it; is this correct?