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  1. #1

    Talking Walk-in-Freezer Help with compressor

    I have the job of making a walk-in-freezer work.
    The freezer was installed 3 years ago.
    it is a mishmash no name, the inly names are on the compressor and the TXV.
    The compressor is a LA50-0400-EWL-202 Coplamatic compressor. The valves have been replaced several times?? The compressor now has 1 phase shorted to ground.
    The Condensing unit is on the roof , low profile and in the sun all day.
    The evaporator is 6 feet below the condenser coil.
    There is a solenoid valve in the liquid line as the liquid line enter the wall behind the walk-in. but there is no low pressure switch anywhere to be found.
    Since I am in Thailand I can not seem to find a rebuilt compressor here, even though the factory is here in Thailand.

    Now for my question, Can I replace the existing condensing unit with a 4 ton A/C condensing Unit, an locate it with in 6 feet of the evaporator and out of the sun. The system uses R-22.

    If this will work it would save me a lot of work and money, I would of course install the proper safety and control circuits.

    I use to work and install walk-in's 40 years ago in Louisiana, but things have changed a lot.

    I would appericate any comments, advice and help with this project.

    Thanks
    Farang (an American in Thailand)

  2. #2
    Join Date
    Jan 2010
    Posts
    6,379
    A/C coil runs at 45* and a freezer coil runs at -20* to -10* there lies the problem.
    Recheck your compressor #. I do not see it in Copelands book.

  3. #3
    I only need to replace the Condensing Unit, I would use the old freezer coil.

    I found the compressor in the Coplamatic book, but none locally??

    Thanks
    Farang (an American in Thailand)

  4. #4
    Join Date
    May 2009
    Location
    The Pas, Manitoba Canada
    Posts
    212
    A/C condensing unit wouldn't have a suction accumulator. If there isn't one on the unit you have to replace that could take out a few valve plates and short out a compressor.

  5. #5
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,680
    Ain't gonna happen
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

  6. #6
    Join Date
    Jan 2010
    Posts
    6,379
    Quote Originally Posted by 2sac View Post
    Ain't gonna happen
    Do you show that model # as good ?

  7. #7
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,514
    Quote Originally Posted by VTP99 View Post
    Do you show that model # as good ?


    I can't find that # either.
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

  8. #8
    Join Date
    Apr 2003
    Location
    Maple Grove, MN
    Posts
    1,326
    Get rid of the R22. It sucks for freezer use. Find a new R404a condensing unit designed for a walk in freezer, and a compatible TXV. Make it work like it is supposed to.

    Note... Try to blow out as much oil as you can from the evaporator and lineset as possible before you decide to switch out the txv and condensing unit to R404a.
    Last edited by ammoniadog; 07-24-2012 at 06:18 PM.

  9. #9
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,421
    Quote Originally Posted by VTP99 View Post
    Do you show that model # as good ?
    Quote Originally Posted by crackertech View Post
    I can't find that # either.
    Powell had it.

    www.hvacrinfo.com/Compressors/cope_semi_asia.pdf

  10. #10
    Join Date
    Sep 2005
    Location
    florida
    Posts
    5,514
    Quote Originally Posted by icemeister View Post


    I should know that he has all the info by now.
    I love the smell of phosgene first thing in the morning:

    To apply for professional membership click here


    Educational forums are open.

    If you would like to submit a link or an article or other related info to the EF. click here

  11. #11
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,221
    This question has been asked many times about using AC compressor for refrigeration , and its always a NO

    Suuuuure it would work for a short period of time ..... maybe .... but dont bother

    Oh and like said , get rid of the 22

  12. #12
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,221
    Quote Originally Posted by farang View Post
    The Condensing unit is on the roof , low profile and in the sun all day.
    Does it have a tin cover ?

    Most are located on the roof .... nothing odd there , but they have a tin shroud.

    Bolt a piece of plywood to the tin to keep sun off it directly. Woods a great insulator

    Hold your hand on one side of plywood , and hold a lighter under it , tell me if you feel any heat

  13. #13
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,680
    Quote Originally Posted by Snapperhead View Post
    Hold your hand on one side of plywood , and hold a lighter under it , tell me if you feel any heat
    All depends on how long you old the lighter there.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

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