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I am changing out my intertherm thermostat control. the blue wire is hooked up on B, not on RC, can you tell me why

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Because it doesn't belong on RC.

B means "blower" in the antique language of the tradesmen, but nowadays it means "reversing valve". RC means "red cool" or "put 24 volts here to power the cooling system".

The blue wire was not connected to RC because it would not bring 24 volts to the RC terminal.

Posted on Jul 24, 2008

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