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What is the function of an “O” or “B” terminal on a White-Rodgers digital thermostat?

April 26, 2017digital function terminal thermostat

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What is the function of an “O” or “B” terminal on a White-Rodgers digital thermostat?

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The “O” terminal is energized constantly when the thermostat is in the cool position. The “B” terminal is energized constantly in the heat position. These terminals are typically used for controlling heat pump equipment or on systems with dampers.