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Is there an easy way to tell if my intertherm furnace is programmable for variable fan speed. It has about 6 wires into the motor so I'm guessing it can . Or what do I need to do.

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I have never heard of a variable speed Intertherm. If it has multiple wires it is likely just an adjustable fan where you can use a different lead for a different speed. Usually black is high blue is med. hi, red is low, ect. Check your wiring diagram on the furnace door. Why do you want to change the speed?

Posted on Nov 24, 2008

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