Thermostat Wiring Heat Pump Gas Furnace

The basic heat pump wiring for a heat pump thermostat is illustrated here.

Thermostat wiring heat pump gas furnace.

This originates from the transformer. 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. This way you have a reference.

My paperback and e book. Terminal r or terminal rh for the red wire. Both the furnace control board and the thermostat will usually have the same terminal letters. Therefore you will use the following color code for simple thermostat wiring.

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. S indoor and outdoor wired sensors. See the diagram below for what each wire controls on your system. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan.

It corresponds to the chart below to explain the thermostat terminal functions.