Lennox XP15 defrost cycle noise
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  1. #1

    Lennox XP15 defrost cycle noise

    http://video.google.com/videoplay?do...72121392736938
    This lennox XP15 2 ton heat pump makes a heck of a racket on the defrost cycle. The outside temp was 37 f. Has anyone had similar experiences with this model or is this one a lemon?

  2. #2
    Join Date
    Feb 2005
    Location
    new york
    Posts
    107
    At 11 seconds that was normal reversing valve,but at 45 seconds that compressor is loud!!

  3. #3
    Join Date
    Aug 2003
    Location
    Lincoln, Nebraska
    Posts
    1,051
    We have installed many of those units and they do not sound like that. Call your service company to check it out.
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  4. #4
    Join Date
    Feb 2008
    Location
    Western NC
    Posts
    2,504
    have it checked out.

    That model is supposed to turn off completely to allow the pressures to equalize before the compressor turns back on... The timing is around 30 seconds so that is good....

    Have them check to start components for the compressor as well as charge and whether the pressures are equalizing like they should. Definately not a normal sound....


    Does it make this noise when the unit starts in heat or is this only a defrost issue?
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  5. #5
    Join Date
    Nov 2001
    Posts
    1,874
    On the out door circuit board there is a pin for the defrost cycle timing.
    Below those setting is a pin for compressor cycling.
    On the XP-15 that pin needs to be in place,
    On the XP-13 that pin needs to be removed.

    That pin allows the compressor to shut down for about 30 seconds and lowers the pressure to allow for a smoother defrost switch over and cycle
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  6. #6
    Quote Originally Posted by iraqveteran View Post
    have it checked out.

    That model is supposed to turn off completely to allow the pressures to equalize before the compressor turns back on... The timing is around 30 seconds so that is good....

    Have them check to start components for the compressor as well as charge and whether the pressures are equalizing like they should. Definately not a normal sound....


    Does it make this noise when the unit starts in heat or is this only a defrost issue?
    The unit does make a loud startup noise but not as loud as when on defrost (2:05 on video).

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