Thermostat Wiring Heat Pump Gas Furnace

S indoor and outdoor wired sensors.

Thermostat wiring heat pump gas furnace.

Terminal r or terminal rh for the red wire. This way you have a reference. See the diagram below for what each wire controls on your system. My paperback and e book.

Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires. It corresponds to the chart below to explain the thermostat terminal functions. Both the furnace control board and the thermostat will usually have the same terminal letters. Furnace thermostat wiring diagram terminal letters on a thermostat and what they control the hot wire 24 volts usually red from the transformer is the main power wire to turn on or off a furnace components.

For example if the red wire is connected to w on the thermostat the furnace should turn on. When the red wire is disconnected from w the furnace should turn off. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. This originates from the transformer.

Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler.