Trying to attach a c-wire to old rheem air handler for a cooling system only. System is so old I didn't see what I thought I'd see when I got up into the attic. In going over the pictures I think I might have figured it out but could use confirmation.
There's a 4 conductor thermostat wire going from the thermostat up to the air handler. Only 3 wires were used I was hoping to attach the blue wire as the C-wire.
Red Rc on thermostat White (or maybe yellow) Y on Thermostat Green G on Thermostat.
There's also a second 2 conductor thermostat looking cable (brown jacket) with a white and red wires.
There's a block that's obviously the line voltage terminal that I didn't take a picture of.
I think I can connect the C-wire to the yellow wire that comes off the left of the transformer or the blue wire it attaches to on the top right of the relay. Easiest is probably to cut the yellow wire and splice the 2 new ends of the yellow wire together with the blue wire from the thermostat cable. Does that sound right?
And out of curiousity what could the other 2 wire cable be going to? It's not to another thermostat.