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  1. #1
    Join Date
    May 2002
    Location
    laredo, tx
    Posts
    62

    Hmm R-22 walk in cooler

    hi all,
    i came across a walk in cooler using R22 but ive never worked on one before, what are the operating pressures? i add r22 up to 50 psig but wouldn't go above that then came the rain and i haven't been able to go back to it. thx
    "Semper Fi"

  2. #2
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,304
    Arw you monitoring liquid subcooling and suction superheat and consulting a PT chart ? Or are you just adding R22 until you see familiar pressures ?

    Doing the lattter could be a waste of expensive R22. Also Im assuming their is a reciever on that cooler and a head pressure control valve.

    Depending on ambient temp you might have to restrict air flow through the condensor to increase liquid saturation temp to 120 degrees to properly charge it.

    Consult your PT chart for corresponding pressure.

    My R22 walkins maintain 34 to 38 degrees with a delta of around 10 to 15 degrees.

    Hope this helps.

  3. #3
    Join Date
    Nov 2004
    Location
    up in the hizzy
    Posts
    1,441
    48-50psi is about right, like anything else, clear the sight glass, check superheat and supcooling.

  4. #4
    Join Date
    Jun 2003
    Location
    Chicago, IL
    Posts
    4,568
    Is the condenser indoors or outdoors?

  5. #5
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,401
    Was it a "hot pull down"? My experience with walk-N is a considerably higher suction pressure during a hot pull down. After box temp gets down to around 45*, the press will be lower.

  6. #6
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,217
    All you need to do with refrigeration is FILL THE GLASS! It's not as hard as AC work.

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,957
    Quote Originally Posted by Dchappa21 View Post
    All you need to do with refrigeration is FILL THE GLASS! It's not as hard as AC work.
    Well, that assumes that it doesn't have a headmaster.


    Subcooling doesn't matter a lot with refrigeration work.

    Solid column of liquid, verified by a sightglass. SET the superheat on the TXVs.

  8. #8
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,855
    Did you find/fix the leak?
    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

  9. #9
    Join Date
    Jan 2010
    Posts
    6,838
    Quote Originally Posted by Dchappa21 View Post
    All you need to do with refrigeration is FILL THE GLASS! It's not as hard as AC work.
    Wow.....I would think the opposite. I do both and find refrigeration to be much more challenging.

  10. #10
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,217
    Quote Originally Posted by jpsmith1cm View Post
    Well, that assumes that it doesn't have a headmaster.


    Subcooling doesn't matter a lot with refrigeration work.

    Solid column of liquid, verified by a sightglass. SET the superheat on the TXVs.
    I'm guessing he isn't going to need to flood the condenser very much in Laredo Texas. LOL... But yes if you have a headmaster you should add your winter charge.
    http://www.sporlanonline.com/90-30-1.pdf

  11. #11
    Join Date
    Apr 2012
    Location
    Paper Street Soap Company
    Posts
    2,304
    Quote Originally Posted by Dchappa21 View Post
    All you need to do with refrigeration is FILL THE GLASS! It's not as hard as AC work.
    Flashing or bubbles in a SG can be caused by other issues and if I remember correctly some blends in refrigeration applications can still bubble even when the unit is charged correctly.

  12. #12
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,957
    I agree with Dchappa.

    HVAC is crazy.

    Refer work is simple 99.8% of the time.

    It's the 0.2% that makes my paycheck, though......

  13. #13
    Join Date
    Sep 2007
    Location
    NH
    Posts
    1,217
    Quote Originally Posted by VTP99 View Post
    Wow.....I would think the opposite. I do both and find refrigeration to be much more challenging.
    I was trying to be sarcastic. I do both as well.

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