Thermostat Wiring Heat Pump Gas Furnace

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

Thermostat wiring heat pump gas furnace.

The basic heat pump wiring for a heat pump thermostat is illustrated here. My paperback and e book. Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. 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. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. 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. Therefore you will use the following color code for simple thermostat wiring.

This originates from the transformer. See the diagram below for what each wire controls on your system. The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc. Terminal r or terminal rh for the red wire.

S indoor and outdoor wired sensors.