Basic Thermostat Wiring To Furnace

The heating system will likely be a gas or electric furnace.

Basic thermostat wiring to furnace. You may use this as a reference for the purpose of each wire. The orange thermostat wire links to your heat pump if you have one. Terminal R or terminal RH for the red wire.

See the diagram below for what each wire controls on your system. Strip the casing ¼ inches from both ends of both wires. A thermostat with five wires typically controls an air conditioner with a heating system.

Run the connected thermostat wire from the furnace to the place where the thermostat will be located. One is red the other is white. Wait for any cooling or heating to stop then turn off your furnaceAC breaker.

The orange wire connects to terminal O on your thermostat. It terminates in your outdoor condenser for reversing valve operation from hot to cold. The thermostat uses 1 wire to control each of your HVAC systems primary functions such as heating cooling fan etc.

Begin your project by turning off power to the furnace. Therefore you will use the following color code for simple thermostat wiring. Wiring a thermostat has been designed to be easy.

Remember that the wire has to go through the furnace covering into the control panel. However depending on who wired the thermostat last they may not have followed the wiring color code. For example if the Red wire is connected to W on the thermostat the furnace should turn on.