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  1. #1
    Join Date
    Feb 2009
    Location
    north of 49
    Posts
    233

    walk in cooler won't cool

    Need some info on this point:

    I have a walk in that is perking out at 60 degreef temps.
    It has a Tecumseh compressor water cooled in the basement crawl pumping up to a duel fan evaporator in the cooled. I have:
    set the high head to bang on 200psi: got the suction at 60 psi (should be cooling at 32 degreef): no problems with the accumulator or dryer: cleaned the evaporator coil so you can eat off it: tested the 2 fans for amp draw and rpm: checked the compressor and it only draws 5.6 amp fla.

    Why the hang can't I get better than 60 degreef cooling? I haven’t gone as far as sizing the unit to the cubic feet in the cooler because I didn't think it necessary. I worked before. This drop in temp has been an ongoing thing over the past 2 months
    thanks
    tl

  2. #2
    Join Date
    Jun 2004
    Posts
    847
    what refregerant do you have it banging on?

  3. #3
    Join Date
    May 2007
    Location
    The South
    Posts
    555
    Assuming you are 134A?
    Need a lot more info on operating conditions,such as superheat and subcool,and discharge superheat.

    When was the last time the condensor was cleaned?
    Stinks that it's in a crawlspace.
    GO DAWGS!

  4. #4
    Join Date
    Dec 2006
    Location
    Middle Tennessee
    Posts
    11,347

    *

    delete

    need more info



    .

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    66,807
    Moved to Refrigeration and Ice making.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #6
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,978
    Need a lot more info.

    As mentioned, SH and refrigerant type are the biggest.

    60# is 24 degrees on 404. A wee bit high, but it will get you in the 'cooler' range.

    If it is 404 and you have a solid column of liquid look at the TEV.

  7. #7
    Join Date
    Mar 2006
    Posts
    1,004
    start with air flow.. though evap, and though condensor.. always start with air flow and clean coils

  8. #8
    Join Date
    Feb 2009
    Location
    north of 49
    Posts
    233
    As i said you can eat off the coils so restriction of air flow is not a problem. It's an old water cooled R22. No I did not do superheat. These units are no that sofisticated. I rely on my guages. The high head has been adjusted to 200 and the low side is topped to 60psig. My cooling should be around 32F. The history on the unit as relayed to me from the owner is that it has been topped a couple of times in the past 2 years. Contaminated gas has crossed my mind. As a solution before condemming the compressor might be to evacuate and put in fresh gas. Thoughts?

  9. #9
    Join Date
    Dec 2005
    Location
    In the sticks,Northern Idaho
    Posts
    339
    Quote Originally Posted by trout lake View Post
    No I did not do superheat. These units are no that sofisticated. I rely on my guages. The high head has been adjusted to 200 and the low side is topped to 60psi. Thoughts?
    Uh Oh, you better duck!
    "The trouble with the world is the stupid are cocksure and the intelligent full of doubt" -Bertrand Russell

  10. #10
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,978
    Check the compressor.

    60# on R-22 will get you a 32 degree evap.

    That's almost AC temps, boss.

    You need about 20# lower suction. Look at the compressor.


    And BTW. Superheat is very important. "Just using your gauges" is only doing half the job. Age of the equipment not withstanding..

  11. #11
    Join Date
    Jul 2008
    Location
    Mid Michigan
    Posts
    319
    You need more info for a proper diaignosis.

    It could be anything.

    Information is power.
    Waddya mean don't thaw out the frig with a knive?

  12. #12
    Poor customer.

  13. #13
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,978

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