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Thread: ball of ice

  1. #1
    Join Date
    Sep 2012
    Location
    northern Ohio
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    140

    ball of ice

    new problem, i have a retail customer with several 5 door ice cream cases. they are using a small rack system {protocol} with eprs on the frozen bunkers only. One of the 4 ice cream cases has a ball of ice that keeps building up arround the txv. It takes about 10 days to start becoming noticable and i have defrosted it for the third time. the doors all shut ok, the gaskets are new, and i haven't found any other access for air to leak in. this case is allong side of another just like it that does not have any build up. they are back to back with two medium temp cases and the other two ice cream cases are across the isle. The defrost is set for 4 per day and 22 min. long each. they are electric defrost and staggered with the other cases so that only one is in defrost at a time. the heaters all work and i have disconnected the early termination stat for this case but that did not seam to have any effect. An "educated engineer" from H P suggested " put a heat tape there". Anybody with a better idea?

  2. #2
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,217
    Check and adjust sh to 4-6 degrees area... But first I would pump that circuit down and clean the txv screen.

    Does the ice cause the case to run warm??

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,946
    Ok, kind of hard to decipher what you're talking about.

    You've got a 5 door ice cream case that the TEV is turning into a ball of ice.

    It's electric defrost 4x daily for 22 minutes?

    #1. Set the TEV and do as Dchappa suggested.

    #2. Why do you need 4 electric defrosts? That's an unusual setup, in my experience. Door cases typically only need one defrost daily and an electric defrost typically wants to be longer than that.

  4. #4
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,071
    Quote Originally Posted by refrigeration johnny View Post
    An "educated engineer" from H P suggested " put a heat tape there". Anybody with a better idea?
    BUAHAHAHA that's awesome!

    Hill Penis
    Negligence

  5. #5
    Join Date
    Jan 2013
    Location
    Northern CA
    Posts
    25
    Sounds like the HP engineer must have worked at Source or one of those other slacker companies...

  6. #6
    Join Date
    Dec 2012
    Location
    Spokane, Washington
    Posts
    124
    Interpret: (4) five door low temp cases with epr valves. Not sure: the med temp are/are not on the same system. Question: refrigerant type, sight glass status, is this rack on heat reclaim, and as stated above (SH on all four cases).
    Has it had this problem before? yes-what has been done (even if it didn't work), no-what changed.
    If these have DTS's then lengthen the time as JP pointed out, let the temp terminate.
    TXV screen blockage is a strong possibilty (Dchappa), as is an insufficient charge.
    HP=HewlettPackard? hahaha

  7. #7
    Join Date
    Dec 2012
    Location
    Spokane, Washington
    Posts
    124
    Interpret: (4) five door low temp cases with epr valves. Not sure: the med temp are/are not on the same system. Question: refrigerant type, sight glass status, is this rack on heat reclaim, and as stated above (SH on all four cases).
    Has it had this problem before? yes-what has been done (even if it didn't work), no-what changed.
    If these have DTS's then lengthen the time as JP pointed out, let the temp terminate.
    TXV screen blockage is a strong possibilty (Dchappa), as is an insufficient charge.
    HP=HewlettPackard?
    why the double post?

  8. #8
    Join Date
    Dec 2008
    Location
    New York, ny
    Posts
    203
    Wanna see she this goes.

    Sent from my SGH-T999 using Tapatalk 2

  9. #9
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by Icanfixitall View Post
    Sounds like the HP engineer must have worked at Source or one of those other slacker companies...
    The I wonder if this guy runs his gas furnace while his ac is running to keep it from freezing up......

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