Nest Red Wire To Rc Or Rh
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An r wire can go into a nest learning thermostat's rc or rh connector. Connect the red wire from the transformer to either the rc or rh terminals (as they are connected internally) run the white wire from the furnace on the w terminal. You can take off the display part and check the rh wire. If you have separate heating and air conditioning systems, you might have separate rh.
If you only have a single red wire the jumper between rh and rc are required for some heating and cooling hybrid systems depending on your thermostat. What color wires go on a nest thermostat? The y wire is yellow. And that is the cooling. The old thermostat has a red wire that is plugged into the port labeled r. There is also a rc on the old one that is empty. The nest has a port for rc and rh but no r. Rc is no different and simply means red cooling. It's a live electrical wire.