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  1. #1
    Join Date
    Mar 2007
    Location
    Austin, Texas
    Posts
    16

    Not a Refer guy.

    I have had some limited experience in refrigeration (commercial) but not a lot and all the stuff I learned in school is lost in the abyss.

    Here is the problem. I have an APEX walk-in cooler and the evap coil is freezing from the bottom first then slowly creeping up. It is a fairly new system.

    First I checked the pitch of the drain pan. Everything is fine, it drains to a secondary drain pan that the high side runs through to evaporate it.

    Both fans are working correctly and the pressure is fine. I adjusted the defrost parameters so that the drip time after defrost is longer to facilitate proper drainage.

    I am going back to check it first thing Monday morning. I suspect the TXV, however I don't remember what I am looking for. Am I barking up the wrong tree, or have I fixed the problem already?

    Help, I HATE repeat calls. If the answer is already posted somewhere else let me know?

  2. #2
    Join Date
    Sep 2006
    Location
    Dallas Tx
    Posts
    55
    need more info!!!!!!!!!!!!!!!!!!!!!!!
    heres a start: low on charge, dirty evap coil, door left open, tstat set too low, bad tstat.

    hope this helps

  3. #3
    Join Date
    Aug 2006
    Posts
    442
    more info is needed. Air defrost? Electric? walk in cooler not freezer

  4. #4
    Join Date
    Mar 2007
    Location
    Austin, Texas
    Posts
    16
    Walk in Cooler, NOT freezer. Coil is freezing from bottom up, and charge is good. Air Defrost. Not door, evap coil clean as a whistle. T-stat is fine, not too low or bad.

  5. #5
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,642
    has a defrost timer, is it running??

  6. #6
    Join Date
    Mar 2007
    Location
    Austin, Texas
    Posts
    16
    Quote Originally Posted by t527ed View Post
    has a defrost timer, is it running??
    yup.

  7. #7
    Join Date
    May 2006
    Location
    Western NY
    Posts
    4,355
    What's your superheat?
    "Excellence is the gradual result of always striving to do better"
    -Pat Riley

  8. #8
    Tap the equilizer line on Monday. From now and into Monday refresh yourself on Superheat and its effects on a coil how it feeds when starved, flooded and running normal.
    FEN

  9. #9
    also make sure you have a drain trap,just curious what gas is it

  10. #10
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,081
    An accumulation of ice starting from the bottom of the evaporator coil that slowly builds over time is an indication that the coil is either not completely defrosting and/or not completely shedding the drip water during each defrost cycle.

    Normally the coil gets a thin layer of frost fairly even distributed over its surface and during an off cycle defrost period the frost melts and the remaining water droplets fall to the bottom and drip off into the pan. In you case it appears that the drip water may be beading up on the lower finned surface due to surface tension and refreezing into ice. Subsequent defrost cycles may be sufficient to melt new frost but not long enough to melt off the ice formation.

    Try spraying the coil with Rain-X. This often does the trick to get that water completely off the coil.

  11. #11
    Join Date
    May 2006
    Location
    Western NY
    Posts
    4,355
    Rain X, good idea. Thanks for the trade secret.
    "Excellence is the gradual result of always striving to do better"
    -Pat Riley

  12. #12
    Join Date
    Mar 2007
    Location
    Austin, Texas
    Posts
    16
    Quote Originally Posted by whec720 View Post
    Rain X, good idea. Thanks for the trade secret.
    Yeah, I would have never thought about that. Thanks.

  13. #13
    Join Date
    Mar 2007
    Location
    Austin, Texas
    Posts
    16
    Quote Originally Posted by push 2 reset View Post
    also make sure you have a drain trap,just curious what gas is it
    It has a trap. Also it is 22.

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