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.

This way you have a reference. This originates from the transformer. S indoor and outdoor wired sensors. 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. The basic heat pump wiring for a heat pump thermostat is illustrated here. Therefore you will use the following color code for simple thermostat wiring. My paperback and e book.

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. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires. It corresponds to the chart below to explain the thermostat terminal functions. 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.