Heat Pump Thermostat Wiring

Heat pump thermostat wiring

In heat pump system, there are at least 8 wires that need to be connected to the thermostat for proper operation.

Does my heat pump use O or B wire?

On many other thermostats, the O wire is typically connected to a terminal marked W on one side and O or O/B on the other side; the W is for use with a conventional system (furnace) while O/B is for use with a heat pump.

11 Heat pump thermostat wiring Images

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