Thermostat Wiring Heat Pump Gas Furnace

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.

Thermostat wiring heat pump gas furnace.

It corresponds to the chart below to explain the thermostat terminal functions. Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. See the diagram below for what each wire controls on your system. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires.

Terminal r or terminal rh for the red wire. This way you have a reference. The basic heat pump wiring for a heat pump thermostat is illustrated here. When the red wire is disconnected from w the furnace should turn off.

This originates from the transformer. Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. For example if the red wire is connected to w on the thermostat the furnace should turn on. My paperback and e book.

The thermostat uses 1 wire to control each of your hvac system s primary functions such as heating cooling fan etc.