Originally Posted by Mrmojo
OK Thank you. Found what I was looking for. I have the freezer part down no problem. Now the fridge side. I don't have an electric thermostat on the fridge side. It uses a mechanical thermostat to mechanically open and close the damper to the freezer. So no wires there. I have a second STC for the fridge side. The cold will be using fans (push/pull) to move air from the freezer with new holes cut in the bulkhead. So I can use the light's neutral wire to complete the circuit? And if I add heat (light in a can)? Also, for the fans (push/pull), should these be wired in parallel? Thanks
It's been a while since I finished the fridge, so I'll do my best. In the end, neither original switch actually does anything. In case of the fridge, the STC uses a parallel hot circuit to rub a fan I fixed over the bottom hole in the wall to suck cold air in from the bottom. The damper was ripped out and I simply placed a sliding trap door over the hole because the freezer fan will blow cold air in. Closing it limits the amount of cold air that moves from one side or the other / helpful when I need to keep the fridge in the warmer side, but it won't stop all cold air.
Anyway, another hot circuit runs from the STC hot connected to the reptile heater with another fan to circulate the warm air inside. Take a close look at the wiring diagram and it should make some sense.