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Thread: Contractors

  1. #1
    Join Date
    Sep 2012
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    Hebderson Ky
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    55

    Contractors

    Found this today. I'm guessing the guy thought he had to have a single pole contactor. Name:  ImageUploadedByTapatalk1368119863.887869.jpg
Views: 483
Size:  49.6 KB
    Attached Images Attached Images  

  2. #2
    Join Date
    Feb 2009
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    Tallahassee, FL
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    Yea somepeople actually believe it acts like trickle circuit crankcase heat

  3. #3
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    Dec 2012
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    columbus, OH
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    Quote Originally Posted by SBKold View Post
    Yea somepeople actually believe it acts like trickle circuit crankcase heat
    I have had 2 teachers tell me this. When I ask were the complete circuit is they get a little jumbled. I just shake my head yes and move on.

  4. #4
    Join Date
    Jul 2009
    Location
    Kansas
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    Some crankcase heaters work off of single pole contactors.... Also check this out: http://www.achrnews.com/articles/sin...ole-contactors

  5. #5
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
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    1,018
    It's true, some crankcase heaters are wired to single pole contactors. The crankcase heater is wired across the open set of contacts, one lead on the line and the other lead on the load side. Power is from the line side of contacts and through the contactor buss via the compressor windings when the contacts are open. When the contacts close, there is zero potential and the crankcase heater is de-energized.
    "The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
    "Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twain
    http://www.campbellmechanical.com

  6. #6
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    Dec 2008
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    Ontario Canada
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    Quote Originally Posted by Core_d View Post
    I have had 2 teachers tell me this. When I ask were the complete circuit is they get a little jumbled. I just shake my head yes and move on.
    I have also been told this by many people, manufacturers included, but never given an actual explanation.

  7. #7
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
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    1,018
    Does not appear crankcase heater is wire to the contactor in this case.

  8. #8
    Join Date
    Dec 2012
    Location
    columbus, OH
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    The "rumor" is the winding in the motor acts as a CCH. I knew their had to be a little truth to it.

  9. #9
    Join Date
    Aug 2009
    Location
    Maine
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    Quote Originally Posted by Hwolfe View Post
    Found this today. I'm guessing the guy thought he had to have a single pole contactor. Name:  ImageUploadedByTapatalk1368119863.887869.jpg
Views: 483
Size:  49.6 KB
    Maybe contacts burned off on that side, red neck repair.

  10. #10
    Join Date
    Feb 2009
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    Tallahassee, FL
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    Quote Originally Posted by Core_d View Post
    The "rumor" is the winding in the motor acts as a CCH. I knew their had to be a little truth to it.
    There is truth to it but not the way some people imply that simply adding a single pole contractor regardless if it kills common or run and run cap somehow creates heat. It simply does not. Any ammeter will show you that.

    Trane was known in the early days to utilize motor windings as cchtr but they used a distinctly different wiring approach to truly accomplish this.

  11. #11
    Join Date
    May 2013
    Posts
    15
    Heres a good article to maybe give you some answers:
    http://www.achrnews.com/articles/sin...ole-contactors

  12. #12
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    Dec 2012
    Location
    columbus, OH
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    Contractors

    Thank for the link.

  13. #13
    Join Date
    Aug 2001
    Location
    Mechanicsville, Virginia
    Posts
    1,246
    He used heavy gauge wire to convert 2pole to 1pole. I see no Shame at all. what gives?

    "If perfection is your goal, you may end up with good enough, what might you end up with when good enough is your goal?"
    Wayne Pendergast, efficientcomfort.net

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