Furnace Wiring Color Code

Can require up to 8 conductors because of the amount of communication needed between the thermostat and air handler or furnace. For shorter runs use 20 gauge. Y2 wire for stage 2 cooling may be colors than light blue.

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O wire for reversing valves in amana carrier ducane goodman heil janitrol lennox heat pumps may vary for othe rmanufacturers.

Furnace wiring color code. The thermostat wiring color code guide. Dark blue wire for reversing valves on rheem ruud heat pumps. It terminates at the air handler or furnace. 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.

R the r terminal is the power. Thermostat wiring and wire color chart thermostat wiring colors code. The green wire underneath your thermostat connects to the fan of your furnace or air handler. The green wire connects to terminal g on your thermostat.

18 gauge thermostat wire is recommended for any distances up to 250 feet. The orange thermostat wire links to your heat pump if you have one. If you only have 4 wires they are typically red yellow green black. Color of wire and termination.

Also referred to as changeover to cooling relay. Choosing the proper gauge. If you have blue white blue stripe orange white orange stripe and possibly green brown pairs as well coming out of the wall then it is probably phone or networking wire and it isn t good because it is too thin for the current.