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  1. #1
    Join Date
    Jul 2013
    Posts
    27

    lennox kGA rooftop?

    Lennox KGA rooftop unit keeps tripping manual high pressure switch on stage 1? anyone similar problem?

  2. #2
    Join Date
    Oct 2012
    Location
    Wisconsin
    Posts
    2,660
    Is the coil clean? Is it grossly overcharged with refrigerant? Do the fans work ok? Those are my three most common reasons for high head pressure.

    How often does it trip, and in what kind of ambient temperatures?

  3. #3
    Join Date
    Feb 2010
    Location
    Calgary, Alberta
    Posts
    1,011
    Quote Originally Posted by dav214 View Post
    Lennox KGA rooftop unit keeps tripping manual high pressure switch on stage 1? anyone similar problem?
    Have you hooked your gauges to it, to see if its actually running high head?

  4. #4
    Join Date
    Jul 2013
    Posts
    27
    Pressure are fine and does not trip when I m there


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  5. #5
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,308
    How big is the unit - how many stages? How many condenser fans? How are the fan amps/capacitor(s)? Any fan cycling control installed? How does the stage 1 contactor look - any chance of welding?

  6. #6
    Join Date
    Jul 2013
    Posts
    27
    7.5,2 stage,2 fans ,fans on with y1


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  7. #7
    Join Date
    Jul 2013
    Posts
    27
    Contactot good, amp good


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  8. #8
    Join Date
    Jul 2013
    Posts
    27
    Micro channel condenser coil



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  9. #9
    Join Date
    Jul 2013
    Location
    Florida
    Posts
    19
    Ran across a similiar scenerio many years ago. In the middle of the night the unit would trip on high head. Got tired of showing up every morning to rest it. Showed up in the middle of the night and found a bum sleeping onto of unit. He confessed he liked the warm air and white noise to help him fall asleep. - probably not what you're encountering

  10. #10
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    826
    [QUOTE=dav214;16747251]Micro channel condenser coil

    Theres yer problem... doesnt take much to over charge them, if I recall a bunch of yorks actually came overcharged from the factory when they first came out

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