Thermostat Wiring Heat Pump Gas Furnace

Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires.

Thermostat wiring heat pump gas furnace.

When the red wire is disconnected from w the furnace should turn off. This way you have a reference. This originates from the transformer. S indoor and outdoor wired sensors.

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

Both the furnace control board and the thermostat will usually have the same terminal letters. Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. Terminal r or terminal rh for the red wire.

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