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.

For example if the red wire is connected to w on the thermostat the furnace should turn on. Terminal r or terminal rh for the red wire. See the diagram below for what each wire controls on your system. Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler.

This way you have a reference. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires. The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc. This originates from the transformer.

Therefore you will use the following color code for simple thermostat wiring. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. My paperback and e book. When the red wire is disconnected from w the furnace should turn off.

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