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  1. #1
    Join Date
    Mar 2007
    Posts
    24

    Confused Compressor windings

    Confused about single phase compressor windings with an internal overload. If my overload is tripped which 2 windings would be open if windings are not identifiable. And when closed which would have the lowest ohm reading.

    Or if someone has a good compressor diagnostics resource it would be great.....

  2. #2
    Join Date
    Apr 2007
    Posts
    6,285
    start winding will have a higher ohm rating then the run winding. The highest ressitance on a good compressor will be between S and R.

    C to S high reading
    C to R low reading
    R to S highest reading
    If the comp is hot then wait for it to cool if you have an open winding then retest. If its still open when cool to the touch you either have a bad winding or an open overload that is stuck open. Either way on hermetic compressors you cant fix it if its open winding or stuck overload.

    if your not sure after that then call out a tech.

    If there is no resistance between the start and run terminals to common, but there is resistance between the start and run terminals, this means that the internal motor overload protection circuit is open. In this last case, allow the motor to cool and re-test it before replacing it.
    Last edited by BigJon3475; 05-05-2007 at 09:45 PM.

  3. #3
    Join Date
    Mar 2007
    Posts
    24
    thanks but what windings might be open with the overload, or is that dependent on the manufacturer.

  4. #4
    Join Date
    Apr 2007
    Posts
    6,285
    Quote Originally Posted by nedberger View Post
    thanks but what windings might be open with the overload, or is that dependent on the manufacturer.
    read edit above.

  5. #5
    Join Date
    Mar 2007
    Posts
    24
    Cool thanks........

  6. #6
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    think about it like this, the overload is "inline" with the common winding!



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