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  1. #1
    Join Date
    Aug 2018
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    1
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    Puzzling Situation with an Ice Cream Freezer

    I am currently servicing a diner with a custom built-in ice cream chest freezer. Initially the compressor was burned out so I replaced it. There was an appropriate amount of refrigerant in the system so I didnt suspect a leak in the system. Vacuum seemed to be fine the first time and the needle stayed still for a long time. After half an hour of putting the refrigerant into the system and running it, the system started losing pressure. Ive used the soap leak detector, dye, and electronic leak detector but Ive had no luck in finding where the leak is. Whenever I try a nitrogen test on the system, the pressure stays still at 250psi, however whenever I try to run the system after charging refrigerant, the pressure goes down so I suspect a leak in the high side of the system. Additionally, I replaced the compressor because there was a slight leak from the service valve, but the system still has a leak. The custom built in ice cream freezer has a cooler portion in the back and the ice cream freezer in the front where it holds jugs of ice cream. The owner has called many other technicians to come service the machine but to no success. They all reported that there is a leak somewhere. Any advice is helpful.

  2. #2
    Join Date
    Nov 2006
    Location
    Athens, Ohio
    Posts
    5,783
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    What needle are you watching during vacuum test? Analog gauges are NOT accurate for evacuation.
    Leaks are found by diligent searching with a leak detector and/or bubble solution.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
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    Questions should end with a question mark "?" Statements end with a period "."

  3. #3
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    9,743
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    Dropping pressure is normal, the box temp should be cooling off after all. A PT chart will show why.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

  4. #4
    Join Date
    Dec 2009
    Location
    maroon lazyboy
    Posts
    2,112
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    Could also be a restriction

  5. Likes HVAC_Marc, 2sac liked this post
  6. #5
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
    Posts
    20,921
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    I, too, second the idea that there's a restriction. Especially after a compressor burnout. It may have been the cause or the result.

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