Thermostat Wiring Heat Pump Gas Furnace

Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan.

Thermostat wiring heat pump gas furnace.

For example if the red wire is connected to w on the thermostat the furnace should turn on. This way you have a reference. Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. Both the furnace control board and the thermostat will usually have the same terminal letters.

S indoor and outdoor wired sensors. Terminal r or terminal rh for the red wire. The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires.

This originates from the transformer. 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. It corresponds to the chart below to explain the thermostat terminal functions.

When the red wire is disconnected from w the furnace should turn off.