Thermostat Wiring Heat Pump Gas Furnace

See the diagram below for what each wire controls on your system.

Thermostat wiring heat pump gas furnace.

This originates from the transformer. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. 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.

My paperback and e book. It corresponds to the chart below to explain the thermostat terminal functions. S indoor and outdoor wired sensors. This way you have a reference.

Therefore you will use the following color code for simple thermostat wiring. When the red wire is disconnected from w the furnace should turn off. Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires.

For example if the red wire is connected to w on the thermostat the furnace should turn on.