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  1. #1
    Join Date
    Jul 2011
    Location
    Central PA
    Posts
    177

    Display case frustration

    This is an old upright display case. R22, semi herm with hot gas defrost. No discernible Model or serial. No crankcase pressure regulator. Box temp was high (50*). Superheat would fluctuate between 10 and 16*, suction between 59-62 psig. head pressure was 215psig (appx 107*) with about 8 degrees subcooling. Initially thought the hot gas solenoid may have been leaking through but I didn't see any temperature difference that would indicate that. At any rate, my suction was too high. I'm not sure what is causing this. Ambient in the store was 73*. Any insight would be much appreciated.

  2. #2
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,920
    Hmmm.

    What might cause high suction pressure with normal to slightly low head pressure???

    I'd look at the compressor.

  3. #3
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
    Posts
    4,380
    Pump down test time...

  4. #4
    Join Date
    Jan 2007
    Posts
    15

    high super heater, high box temperature.

    I think liquid volume is not enough. but the head pressure not high. maybe one piston of compressor had short circuit.

  5. #5
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
    Posts
    4,380
    Both pistons run off the same motor. You can have a broken rod, and still operate provided the rod broke very near to the crankshaft. If its a k-body, it doesn't have any kind of piston rings, so it will scrape the side of the cylinder and eventually loose capacity.

  6. #6
    Join Date
    Jun 2011
    Location
    Barbados
    Posts
    34
    As the others said sounds like your compressor.

  7. #7
    Join Date
    Jul 2011
    Location
    Central PA
    Posts
    177
    Unfortunately I couldn't do a pump down. The only service valves were @ the compressor. It is a K-body. The comp is also making an odd repetitious clicking sound. I'm thinking I'm going to have to tell my service manager that the compressor is on it's way out. Just wanted to Make sure I wasn't missing anything. Thanks for the replies.

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