![]() In most thermostat wiring hookups the orange wire is used to control a reversing valve - switching from heating to cooling mode or vice-versa. O Heat pump changeover (heat to cool, powered in cool) In most thermostat hookups the green wire is used to control a fan. ![]() ![]() If not Trane, tape off B.Ĭ - common 24VAC power used to power the thermostat. providing the return path for the circuit. In thermostat applications where a blue wire is used, the blue is usually a common circuit wire - e.g. RH power for HEAT (RH not connected to RC, jumper, clip removed)ī heat pump changeover (cool to heat, powered in heat mode) Possible Wire ID Label or Connection Point ID Label on ThermostatĬontrol Function / Connection Point for This Wire Thermostat Wire ID Tags or ID of Connector Terminals in a Room Thermostat
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