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  1. #1
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    148

    alk in freezer moisture refreeze on ceiling

    Working on a small walkin freezer that is about 1 1/2 yrs old. It has had the issue of moisture refreezing on the ceiling. Did have a backed up drain. That has been fixed. Otherwise freezer working ok. The defrost cycle does terminate aprox. 20 min. Looking for ideas to look at.
    Helgy

  2. #2
    Join Date
    Dec 2011
    Location
    Northeast PA
    Posts
    209
    is it happing right in front of the coil?

  3. #3
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    148

    freezer

    Yes it is. Seems like excess moisture off the evap.
    Helgy

  4. #4
    Join Date
    Dec 2008
    Location
    NW Iowa
    Posts
    121
    Clearing the drain will help rid excess moisture. Other things to look for are if the fans are not staying off after defrost until the coil refreezes. Also if you defrost too often, the water drops will vaporize instead of forming a drop and running down the coil and drain.

  5. #5
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    148
    Good info. Heading back to the site tomorrow. I will run it through a complete defrost cycle. Thanks

  6. #6
    Join Date
    Dec 2006
    Location
    In a Mess
    Posts
    1,001
    what is defrost frequencey?
    how much is door opened?
    does door have strip curtains?
    Sig removed by mod. G-Rated site

  7. #7
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Typically a defrost termination issue, not terminating on temp and fans coming on while coil still warm. Force it into defrost with no ice on coil, should terminate pretty quick and fans should not start for a few minuts.

  8. #8
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    148
    On site right now. I will try that. Thanks

  9. #9
    Join Date
    Oct 2003
    Location
    Minnesota
    Posts
    148
    What I came up with is the defrost term. Switch is working. I have 208v between 3 and X back at the clock. Still will not term defrost. Must have a bad defrost term relay in the time clock. Is this a common thing?

  10. #10
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Yep

  11. #11
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,904
    Quote Originally Posted by helgy View Post
    What I came up with is the defrost term. Switch is working. I have 208v between 3 and X back at the clock. Still will not term defrost. Must have a bad defrost term relay in the time clock. Is this a common thing?
    The failure I have found is the plastic yoke breaks in the back of the clock. It's toast.

    Make sure you configure the jumper strips on the new clock to be identical to the old, since not all designs use the clock terminals in an identical manner.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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