4 Wire Thermostat Color Code. Thermostat wiring color code. Thermostat wiring and wire color chart thermostat wiring colors code.
The orange wire connects to terminal o on your thermostat. Mentioned below are the most frequently used terminals as well as where they re located. Thermostat wiring and wire color chart thermostat wiring colors code.
Color of wire and termination.
It is a red wire and comes from the transformer usually located in the air handler for split systems but you may find the transformer in the condensing unit. Tuned the targeting for 4 wire thermostat wiring color code removed ad code and added tags. The above is a typical wiring diagram of a nest thermostat with 4 wires. It terminates in your outdoor condenser for reversing valve operation from hot to cold.
