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Thread: Backwards ?..

  1. #1
    Join Date
    Jan 2013
    Location
    Western Ky
    Posts
    151

    Backwards ?..

    Came across a no cooling serv call today older trane split condenser fan running backwards capacitor looked like it ate a watermelon replaced cap and fan ran in right direction, I've never seen a bad cap make it run in reverse,

  2. #2
    Join Date
    Dec 2011
    Location
    Northeast PA
    Posts
    209
    did you have some recent storms?

  3. #3
    Join Date
    Jan 2013
    Location
    Western Ky
    Posts
    151
    No storms

  4. #4
    Join Date
    Jun 2013
    Location
    Fremont OH.
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    164
    I have seen that before if the blade is already going it will just take off in that direction.

  5. #5
    Join Date
    Sep 2002
    Posts
    12,659
    Shorted capacitors do that sometimes.

    PHM
    -------






    Quote Originally Posted by Mr toon View Post
    Came across a no cooling serv call today older trane split condenser fan running backwards capacitor looked like it ate a watermelon replaced cap and fan ran in right direction, I've never seen a bad cap make it run in reverse,
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  6. #6
    Join Date
    Jan 2013
    Location
    Western Ky
    Posts
    151
    Never seen this before was kind of baffled

  7. #7
    Join Date
    Jan 2006
    Location
    McQueeney, Texas
    Posts
    3,885
    Without the phasing of the cap, the motor doesn't know which way to start.

    You could have hand turned it the other direction just before starting it and it would have turned in that direction.

  8. #8
    Join Date
    Jun 2011
    Location
    Central Indiana
    Posts
    615
    The shorted cap can cause the winding go out of phase. The poles will buck back and the shaft can spin backwards. The motor wont run correctly, usually to slow and sometime it will sound odd too, but it is believable.
    The only true knowledge is the pursuit of knowledge

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