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  1. #14
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    2,067
    We ran the test again today, everything was normal, cap tested within 5% so all was good.

    Someone mentioned the wire going the same direction. That is a possibility. The common wire was directly down off the contractor. The run wire was in a bundle, but had a loop right by the common. That's where I took the C-R reading. So current flow could have been down on the common and up on the start where it went through the clamp. I will have to experiment some more and get back with results.

  2. #15
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    2,467
    www.ncidavid. B L O G S P O T .com

    Enter in this website...not sure why the HVAC-TALK mother ship is forcing asterisks to divert any mentioning of ********. Obviously enter in website with no spaces

    scroll down to March 29th for his blog on testing a capacitor live.

  3. #16
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    2,467
    Interesting.... it automatically added asterisks again!!! Very interesting
    If I spell it B L O G S P O T it will work

    Lets try blogS P O T

    will try ********

    how about ********

  4. #17
    Join Date
    Feb 2009
    Location
    Manchester, TN
    Posts
    329
    I've been doing this for years and it almost always works out. It's a lot easier to just do a few amp draws on pms than to pull wires and check the capacitor dead. Did you do a resistance check on the compressor. Maybe with the compressor running on a dead capacitor it had some hot windings screwing up the resistances causing weird amp draws? Just kinda guessing on that though. My opinion would be just a bad amp draw measurement.

  5. #18
    Join Date
    Nov 2011
    Location
    Texas
    Posts
    308
    ********
    (((PEACE IS THAT BRIEF MOMENT IN HISTORY WHERE EVERYBODY STANDS AROUND RELOADING)))

  6. #19
    Join Date
    Nov 2011
    Location
    Texas
    Posts
    308
    ill be dang. wonder what else forbidden
    (((PEACE IS THAT BRIEF MOMENT IN HISTORY WHERE EVERYBODY STANDS AROUND RELOADING)))

  7. #20
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,039
    Quote Originally Posted by hvacrmedic View Post
    What you need to do is skip that test because it's bogus. As for the results you got, you had the common reversed in the clamp relative to the run, causing the currents to add. Normally they will subtract.
    Trane units facilitate this happening by the way they wired common to the other side of cap

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