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  1. #1
    Join Date
    May 2018
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    Recovering air on accident?

    I just got into the field and I'm certified to recover 5 lb and under. My question is how can I tell if my yellow jacket recovery machine keeps shutting off and turning back on during recovery due to a leak and it's sucking in air or there really is refrigerant still in there? I realize I can put a vacuum on it but I'm trying to balance what I'm supposed to do, that is not intentionally release refrigerant into the air, and what is actually practical without knowing, that is trying to figure out if all the refrigerant is already gone or if there's a leak by switching to a vacuum.

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  2. #2
    Join Date
    Mar 2013
    Location
    Billington Heights, NY
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    The machine turns off and back on either due to over-pressure or over-temperature. Chilling the recovery tank often helps with over pressure problems. Over-temperature is harder to deal with as it is a machine problem. Look in the owner's manual for solutions.

    If you dont disconnect the machine when it stops there will still be refrigerant in the system. For recovery, you only need to get it down to 0 psi or a slight vacuum. a stubby gauge on one of the service ports is very helpful.

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  4. #3
    Join Date
    May 2018
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    29
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    Thread Starter
    Thanks for the response!

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  5. #4
    Join Date
    Oct 2002
    Location
    Plano, TX
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    2,177
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    Don't skimp on the extention cord.

  6. #5
    Join Date
    Aug 2009
    Location
    Beatrice, NE
    Posts
    6,556
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    If you pump it into a vacuum and it only goes up to 0 you have a leak, if it goes above 0 you still have refrigerant.

    If you are only certified for up to 5 lb how can you work on most new systems that are over 5 lb factory charge?

  7. #6
    Join Date
    Feb 2014
    Location
    Phoenix Arizona
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    911
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    Quote Originally Posted by BNME8EZ View Post
    If you are only certified for up to 5 lb how can you work on most new systems that are over 5 lb factory charge?
    The cert he has is meant for appliance techs working on residential refrigerators. Larger low temp machines and comfort cooling is an additional certification. Not sure why anyone would bother. Just go for the universal, it’s only a few more questions.



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