What Is B On Thermostat
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Is b common on trane thermostat? In most thermostat wiring hookups the white wire is used to switch heat on or off from the thermostat. Trane uses b for this connection. In most thermostat wiring hookups the yellow wire is used to switch cooling on or off from the thermostat.
A wire labeled o, b, or o/b is used to control whether a heat pump is in heating or cooling mode. However, on some thermostats, a wire labeled b is the common wire c. In most cases, the common wire is labeled c. What color is c wire? Here are common uses for wire colors: The o/b terminal is for heat pump systems and is used for the reversing valve. When the o option/position is selected the reversing valve defaults to the heating mode. If the b option/position is selected the reversing valve defaults to the cooling mode. It is extremely import that the correct mode is selected.
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