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Thread: Rheostat for swamp cooler?

  1. #1

    Default Rheostat for swamp cooler?

    A customer has a very old swamp cooler that has a 1 speed fan motor. The switch only has "on"/ "off". The fan blows too hard and he wants a lower speed. If I put in a 2 speed motor, I must need a different kind of switch to operate it, but I'm not sure what kind of switch to get.

    Is it possible to just wire in a rheostat so he can have a variable speed fan, and, if so, where would I put it? I don't want the pump to have variable speed. Just the fan.

  2. #2
    Electrical Contractor/Instructor jwelectric's Avatar
    Join Date
    Jun 2007
    North Carolina



  3. #3
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    That motor, probably a simple, so-called universal , motor, will burn up if you try to vary the speed.

    You would need to replace it with a multi-speed motor, or a more expensive true variable speed motor with speed controller.


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