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  1. #1
    Join Date
    Jul 2004
    Location
    Oakland, CA
    Posts
    54
    Is correct to charge refrigerant as liquid when the unit is running?....A co-worker says that can occur an accident when the refrigerant cilynder is to low becouse pressure difference, Is that true?. Thanks for comments.

  2. #2
    Originally posted by josan6
    Is correct to charge refrigerant as liquid when the unit is running?....

    Assuming you mean into the suction side, it depends on refrigerant and the technician's skill level. In the old days before all the new refrigerants were around, r-12, r-22, and the others were commonly charged in the liquid state to the suction side thru one's manifold gauges, although any text book you read would discourage that practice. This should not be attempted by the inexperienced. For refrigerants that are suseptible to fractionation, check with the manufacturer to see if they can be charged in the vapor state. For those refrigerants that need to be charged in the liquid state, some means of flashing the liqid into a vapor during the charging process is recommended.


    A co-worker says that can occur an accident when the refrigerant cilynder is to low becouse pressure difference, Is that true?. Thanks for comments.
    Not sure I understand you co-workers comment. Ask him to restate it.

  3. #3
    Join Date
    May 2004
    Posts
    11,967
    Originally posted by josan6
    Is correct to charge refrigerant as liquid when the unit is running?....A co-worker says that can occur an accident when the refrigerant cilynder is to low becouse pressure difference, Is that true?. Thanks for comments.
    I think what he is saying that if a drum has a lower pressure than the system pressure there would be damage to the drum.

    Depends on if you use a drum with a backflow device. Most small drums come standard with the backflow device to prevent the re-use of the old drum.

    The backflow device will not allow pressure to enter this type of drum and there will be no danger. If you are using a big cylinder then I wouldn't think your system would have enough pressure to damage the casing.

    So if you are using cylinders of 50lbs or less and that are not an old style tank... there will be no damage.

    If you use the piercing auto can, you are own your own.

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