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  1. #1
    Join Date
    Dec 2010
    Location
    Goodyear, AZ
    Posts
    57

    Compressor thermal overload open in heat mode

    Hey guys,
    Hoping you could steer me in the right direction. I'm working on a heat pump in heat mode. Pressures are good while I'm there. Indoor coil clean, blower good. Issue is compressor is shutting off on internal overload, around the time when the outdoor temp drops.
    House has two systems. I had to change the outdoor txv on the other system. (Pressures were way off on that one, which made it easy to diagnos. Runs like a champ now)
    I'm thinking this system is doing the same thing( faulty TXV- closing too much, starving the compressor, causing it to overheat), just not as pronounced as the other system.
    Thanks for the help brothers.

  2. #2
    Join Date
    May 2009
    Location
    Savannah, Ga/H.H. Island, S.C.
    Posts
    1,502
    Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial?

    The more info the more help you can get.

  3. #3
    Join Date
    Dec 2010
    Location
    Goodyear, AZ
    Posts
    57
    [QUOTE=Brent Ridley;14865541]Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial?

    Lennox 13HPD series, split, r22, outdoor temp around 60. Pressures little bit higher then operation table showed. Vapor around 55 , liquid around 220

  4. #4
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,618
    Since you are a Pro member, may I recommend to you that this be moved to Pro Residential?

    Ask a moderator.
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  5. #5
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
    Posts
    1,018
    What's the amp draw and superheat?
    "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
    Join Date
    Dec 2010
    Location
    Goodyear, AZ
    Posts
    57
    Didn't check that. I had my hands full working on other system at the time. Amp draw would be high on a comp that was eventually going to open on overload?

  7. #7
    Join Date
    Jun 2004
    Location
    Eugene, Oregon
    Posts
    1,018
    Quote Originally Posted by weebitdry View Post
    Didn't check that. I had my hands full working on other system at the time. Amp draw would be high on a comp that was eventually going to open on overload?
    Compressor is overheating for some reason. Usually high amp draw due to compressor bearings failing or lack of cooling due to high superheat.
    "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

  8. #8
    Join Date
    Jan 2010
    Location
    Vancouver Island
    Posts
    354
    [QUOTE=weebitdry;14865801]
    Quote Originally Posted by Brent Ridley View Post
    Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial?

    Lennox 13HPD series, split, r22, outdoor temp around 60. Pressures little bit higher then operation table showed. Vapor around 55 , liquid around 220
    I take it 55 psig is off the vapour line. Does this unit have a suction service port that will show suction pressure at compressor? If so have you measured it?

  9. #9
    Join Date
    Dec 2010
    Location
    Goodyear, AZ
    Posts
    57
    Yes. 55 psi at suction access port. Runs good during the day. ( or both times I was checking it) problems occur at nite, when temp drops.

  10. #10
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,051
    Recip or scroll?

    Defrost problem?

  11. #11
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,245
    Have you run it through a defrost cycle to make sure the sensor is taking it out of defrost correctly?
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

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