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  1. #1
    Join Date
    Oct 2017
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    1
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    Copeland Scroll Charging (R22)

    Hi All,

    Recently out of trade school and have finished a repair on a pumyang water cooled package unit.

    I have to charge it with 3.1 KG of R22, I am getting conflicting messages on the best way to charge as I have no access to the liquid line. I would have thought the best option would be to charge liquid into the suction and then leave if for 20-30 minutes to boil off. However I have also been told to charge as much vapour into the suction side and then meter in liquid until I reach the nameplate charge.

    A bit confused, which way is better ? neither ? any other options ?

    Cheers,

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    15,840
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    Have you changed the drier?

    No access then how are you going to measure the S C?

  3. #3
    Join Date
    Feb 2009
    Location
    Toronto, Ontario
    Posts
    50
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    What kind of repair was made? If circuit opened might as well have installed liquid line service valve then charge with liquid if not then just charge in with vapour on suction side to weighted in charge at this point.

  4. #4
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    15,840
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    With Water coils extreme care needs to be taken when charging!

  5. #5
    Join Date
    Feb 2006
    Location
    Phoenix,AZ
    Posts
    3,399
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    You can dump it into the suction just wait a while before starting. I do it with mini splits that have no LL access.

  6. #6
    Join Date
    Nov 2011
    Location
    East Side
    Posts
    4,598
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    With any unit that uses water for heat exchange, you have to be very careful.

    ALWAYS have a pump running, so the water is not standing in the unit.

    Evacuate the unit, charge gas until the saturated temp. Is above 34-36* F, then throw the liquid to it. Failure to follow this method could resault in tube rupture.

  7. #7
    Join Date
    Jan 2017
    Location
    Rhode Island
    Posts
    541
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    What if it was a Blend,410A?

  8. #8
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
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    Quote Originally Posted by Zmaniac View Post
    What if it was a Blend,410A?
    Water Flow!

  9. #9
    Join Date
    Nov 2011
    Location
    East Side
    Posts
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    We charge 134A the same way

  10. #10
    Join Date
    Jan 2017
    Location
    Rhode Island
    Posts
    541
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    Quote Originally Posted by 71CHOPS View Post
    We charge 134A the same way
    As a Gas? Not being a wise guy,just trying to learn.

  11. #11
    Join Date
    Nov 2011
    Location
    East Side
    Posts
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    Yes, into large chillers.

  12. #12
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    15,840
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    Quote Originally Posted by 71CHOPS View Post
    Yes, into large chillers.
    The first 2 or 3 100# bottles as vapor the next 5 or 6 liquid

  13. #13
    Join Date
    Jan 2017
    Location
    Rhode Island
    Posts
    541
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    I thought you couldn't charge a Blend as a Gas. But I guess if your dumping it all in,it will mix,blend,whatever.

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