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  1. #1
    Join Date
    May 2010
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    New jeresey
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    15

    Cool decreased fan motor amperage

    On my air handler, will i get lower than normal amperage readings, if my return air damper shuts or will the motor struggle trying to pull air back causing higher amperage.

  2. #2
    Join Date
    Nov 2002
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    NJ - WORK IN NYC AREA
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    1,480

    Hmm

    If it's a centrifical fan, the less air you move the lower the amperage.
    "My hands are for sale"

  3. #3
    Join Date
    Jul 2009
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    In a mechanical room....
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    1,888
    Put your amp meter on motor and remove cover, but yeah most of the time the amps will drop
    “It takes courage to grow up and turn out to be who you really are.”

    - E.E. Cummings

  4. #4
    Join Date
    May 2010
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    New jeresey
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    15
    yah thanks for the info

  5. #5
    Join Date
    Nov 2006
    Location
    Southeastern Pa
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    19,495
    Quote Originally Posted by icedr024 View Post
    On my air handler, will i get lower than normal amperage readings, if my return air damper shuts or will the motor struggle trying to pull air back causing higher amperage.
    When you block off the return air (the damper closes) you are "starving" a typical blower -type fan for air. Less air is available, less work is being done, lower amps will flow to do that lesser amount of work.
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