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  1. #14
    Join Date
    Jun 2004
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    Location:Raleigh NC
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    Sounds like flood back
    You need to take the EPA 608 test and pass it to do what you want.
    get a study Guide and study up then take the test you need a min of level II to work on a split systems and/or over 5 pounds
    If you help others then you are a Success

  2. #15
    Join Date
    Sep 2008
    Location
    Western PA
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    25,760

  3. #16
    Join Date
    Jun 2004
    Location
    Location:Raleigh NC
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    9,643
    Get a good tech out there and hang with them ask question and then read up on the what and why. Your Not Legal to be working with the AC yet and you aren't ready to be YET.

    But It will come in time, Like your eagerness to learn.

    Good luck in school
    If you help others then you are a Success

  4. #17
    Join Date
    Apr 2009
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    R.O.T.
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    301
    Quote Originally Posted by ascj View Post
    A over charged system can frost a suction line. Your feeling, is just that a feeling. Leave to it some one else, until it's not a feeling anymore.
    Can you help me understand how an overcharged system can frost a suction line?

  5. #18
    Join Date
    Sep 2008
    Location
    Western PA
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    Quote Originally Posted by Edwin73 View Post
    Can you help me understand how an overcharged system can frost a suction line?
    With a fixed metering device, an overcharge will lead to low superheat.

  6. #19
    Join Date
    Jun 2006
    Location
    New Jersey
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    4,340
    Quote Originally Posted by Edwin73 View Post
    Can you help me understand how an overcharged system can frost a suction line?
    Or any metering device with low airflow and someone added gas to try to fix the system. If your suction line gets to 32 degrees or below it will freeze.

  7. #20
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    Apr 2009
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    Quote Originally Posted by jpsmith1cm View Post
    With a fixed metering device, an overcharge will lead to low superheat.
    True, but a low superheat does not mean that the line temp will be below 32degrees F.

  8. #21
    Join Date
    Apr 2009
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    Quote Originally Posted by ascj View Post
    Or any metering device with low airflow and someone added gas to try to fix the system. If your suction line gets to 32 degrees or below it will freeze.

    32 degrees or below will freeze, but overcharging will raise the saturation temp.

  9. #22
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    Sep 2008
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    Western PA
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  10. #23
    Join Date
    Jun 2006
    Location
    New Jersey
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    Quote Originally Posted by Edwin73 View Post
    32 degrees or below will freeze, but overcharging will raise the saturation temp.
    You basing this on proper air flow. jpsmith1cm and I are pointing out that, most guys see low pressures and/or frost and add gas and over charge the unit. So yes a overcharged unit can have a frozen suction.

  11. #24
    Join Date
    Apr 2009
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    Quote Originally Posted by ascj View Post
    You basing this on proper air flow. jpsmith1cm and I are pointing out that, most guys see low pressures and/or frost and add gas and over charge the unit. So yes a overcharged unit can have a frozen suction.

    Even with low airflow, a system can be overcharged to the point where it will not freeze. I've recovered many a lb of refrigerant out of a grossly overcharged system that was not freezing until the saturation temp dropped below 32 degrees F.

  12. #25
    Join Date
    Jun 2006
    Location
    New Jersey
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    4,340
    Quote Originally Posted by Edwin73 View Post
    Even with low airflow, a system can be overcharged to the point where it will not freeze. I've recovered many a lb of refrigerant out of a grossly overcharged system that was not freezing until the saturation temp dropped below 32 degrees F.
    Did I say all?

  13. #26
    Join Date
    Apr 2009
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    Quote Originally Posted by ascj View Post
    Did I say all?

    Don't get me wrong, I'm not questioning y'alls ability or anything. I really enjoy talking about the thermodynamic properties of refrigerant, and I'm always open to learning something new. I guess I just misunderstood.

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