Rheostat for swamp cooler?

Discussion in 'Electrical Forum discussion & Blog' started by Verdeboy, Jun 27, 2007.

  1. Verdeboy

    Verdeboy In the Trades

    Jun 12, 2006
    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. jwelectric

    jwelectric Electrical Contractor/Instructor

    Jun 14, 2007
    North Carolina
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  4. jimbo

    jimbo Plumber

    Aug 31, 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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