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Old 10-05-2012, 09:24 AM   #1
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Wiring a thermostat to run fan motor.


How do you wire a thermostat to run a fan blower only on a gas furance

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Old 10-05-2012, 09:34 AM   #2
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Wiring a thermostat to run fan motor.


It's not always possible. If a thermostat has a fan switch AND the furnace control allows it you should be able to make it work with simple thermostat connections. The control board of the furnace will be ready for this connection. What wires are you working with to the thermostat? Got a picture? What connections are at the furnace?

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Old 10-05-2012, 10:57 AM   #3
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Wiring a thermostat to run fan motor.


If your furnace predates a control board, it's still possible to do with a fan relay if you have a thermostat with a fan switch and an available line to carry the switching 24V.
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Old 10-05-2012, 01:50 PM   #4
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Wiring a thermostat to run fan motor.


you have to chase the fan cycle into the heating signal if you have a control module it will come off that on a delay with that black relay board mounted you see with arating tag stamped
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Old 10-05-2012, 03:15 PM   #5
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Wiring a thermostat to run fan motor.


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Originally Posted by Kedro View Post
How do you wire a thermostat to run a fan blower only on a gas furance
More info about your setup is needed to be truly helpful.
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