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Thread: NF6 headaches

  1. #1
    Join Date
    Sep 2008
    Location
    Western PA
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    25,918

    NF6 headaches

    OK. Here we go.

    One of my stores is having trouble with a couple Hussmann NF6 cases (Impact type open high back cases). I haven't been there yet, but I will, SOON, I'm sure.

    Here is what I know.

    Honeycombs have been cleaned, HG defrost checks out (3x daily, 12 minutes, 15 runoff, 60 termination)

    Complaint is that there is ice building in the honeycombs.

    Humidity is "good". Nobody gave me specific readings like I asked for.

    Thought? Suggestions?

    Thanks.

  2. #2
    Join Date
    Oct 2001
    Location
    Stoney Creek, Ontario
    Posts
    885
    Quote Originally Posted by jpsmith1cm View Post
    OK. Here we go.

    One of my stores is having trouble with a couple Hussmann NF6 cases (Impact type open high back cases). I haven't been there yet, but I will, SOON, I'm sure.

    Here is what I know.

    Honeycombs have been cleaned, HG defrost checks out (3x daily, 12 minutes, 15 runoff, 60 termination)

    Complaint is that there is ice building in the honeycombs.

    Humidity is "good". Nobody gave me specific readings like I asked for.

    Thought? Suggestions?

    Thanks.
    rip them out, install doors

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
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    25,918

  4. #4
    Join Date
    Mar 2009
    Posts
    174
    I believe those cases have anti sweat heaters in the primary honeycombs. Could be that.

  5. #5
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,918
    Some resolution to the problems.

    Yes, I finally got there, as predicted.

    Humidity in store was not "good" as I was told. Store was cold and humid. A dose of heat reclaim dried that out pretty nicely. Store is actually comfortable now.

    Also, hot gas differential was only about 10 psid. Crank that to 20 for a better flow through defrost.

    Now for the tricky one. Out of 25 circuits, 2 were overlapping hot gas defrost. Want to guess what one of them was?

  6. #6
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,071
    CU23

    could it be the cases in question?toe tap2

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
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    Quote Originally Posted by Phase Loss View Post
    CU23

    could it be the cases in question?toe tap2
    cheers1

    You got it.

    det1

    Hot gas defrost doesn't much care for overlapping defrosts.

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