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    dannyg's Avatar
    dannyg Posts: 6, Reputation: 1
    New Member
    		  
    #1

    Jul 19, 2010, 05:30 PM
    How to check comp. short to ground
    How to check for grounded comp. windings
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 19, 2010, 11:25 PM
    Quote Originally Posted by dannyg View Post
    how to check for grounded comp. windings


    The use of an OHM meter is necessary for this task and a megger is even better.

    Check S to R, R to C and C to S and all to ground.
    The highest resistance will be R to S
    The lowest will be C to R
    The sum of the resistance from C to S and C to R equals resistance from R to S.
    A megger will give you a more acurate result than an ohn meter.

    Here is a manual that might help you understand some principles behind electrical testing of compressors. There is more to them besides being grounded.
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    2. dannyg's Avatar
    dannyg Posts: 6, Reputation: 1
    New Member
    		  
    #3

    Jul 20, 2010, 04:29 PM
    Quote Originally Posted by hvac1000 View Post
    The use of an OHM meter is necessary for this task and a megger is even better.

    check S to R, R to C and C to S and all to ground.
    the highest resistance will be R to S
    The lowest will be C to R
    The sum of the resistance from C to S and C to R equals resistance from R to S.
    A megger will give you a more acurate result than an ohn meter.

    Here is a manual that might help you understand some principles behind electrical testing of compressors. There is more to them besides being grounded.
    thank you answer very hlpfull dannyg.
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