Thermostat Wiring Heat Pump Gas Furnace

Both the furnace control board and the thermostat will usually have the same terminal letters.

Thermostat wiring heat pump gas furnace.

The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc. See the diagram below for what each wire controls on your system. It corresponds to the chart below to explain the thermostat terminal functions. When the red wire is disconnected from w the furnace should turn off.

Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires. The basic heat pump wiring for a heat pump thermostat is illustrated here. Terminal r or terminal rh for the red wire. My paperback and e book.

Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. For example if the red wire is connected to w on the thermostat the furnace should turn on. Therefore you will use the following color code for simple thermostat wiring. This way you have a reference.

S indoor and outdoor wired sensors.