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. This originates from the transformer. The basic heat pump wiring for a heat pump thermostat is illustrated here.

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

Thermostat wiring heat pump gas furnace.

Heating only thermostat wiring diagrams if you only have a furnace such as a gas furnace oil furnace electric furnace or a boiler. Therefore you will use the following color code for simple thermostat wiring. S indoor and outdoor wired sensors. For example if the red wire is connected to w on the thermostat the furnace should turn on.

Both the furnace control board and the thermostat will usually have the same terminal letters. Before uninstalling the old thermostat take a picture of the wiring with your cell phone before removing the wires. This way you have a reference. It corresponds to the chart below to explain the thermostat terminal functions.

Y compressor stage 1 cooling y2 compressor stage 2 cooling g fan. Terminal r or terminal rh for the red wire. See the diagram below for what each wire controls on your system. My paperback and e book.

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

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