Condensation on a/c line set.
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  1. #1
    Join Date
    Nov 2003
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    4
    Can anyone explain why the small un-insulated freon line, going from the coil in my oil furnace to the compressor unit outside, is dripping wet with condensation? The water is dripping onto my drop ceiling creating stains. What can I do to fix this? Is there a problem with the system?

    Thanks in advance,
    Jeff

  2. #2
    Join Date
    Feb 2004
    Location
    Maine
    Posts
    483
    The smaller uninsulated line is the liquid line, if it's sweating that means the liquid is boiling off in that line, undercharged probably, could be low head pressure due failing comp? Call for service and have someone check it out, and make sure they charge by superheat or subcooling, which method depends on the type of metering device.

  3. #3
    Join Date
    Nov 2002
    Location
    emerald city, sc
    Posts
    1,469
    is this happening with the unit running in cooling mode, the heating mode, or off.
    i wanted to put a picture here

  4. #4
    Join Date
    Nov 2003
    Posts
    4
    This is happening while running in the heating mode in the winter MD climate.

  5. #5
    Join Date
    Jan 2002
    Location
    Ft.Worth,Tx
    Posts
    4,584
    Need to have unit checked by professional. But, for now try and get some insulation 3/8" and cover the line from evaporator to where it goes through the wall.
    "Everyday above ground, is a good day".
    "But everyday that you have made a difference in someones life, may insure you stay above ground a little longer".<aircooled>

  6. #6
    Join Date
    Nov 2002
    Location
    emerald city, sc
    Posts
    1,469
    insulating the pipe will be the cheapest fix
    i wanted to put a picture here

  7. #7
    Join Date
    Jul 2004
    Location
    midwest
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    2,868
    Jeff, I am very interested in your problem if its anything like whats happening with a couple of our units. Is your unit a A/C only and not a heat pump? When this drips, is the outside unit off?

  8. #8
    Join Date
    Feb 2005
    Location
    Dothan, Al
    Posts
    3,453

    Jeff

    Is the coil for the oil furnace in the attic with the lines.
    In other words, is the cooling coil above the refrigerant lines. Or do they go up from a closet type furnace & coil, into the attic ( or overhead space ) ?

  9. #9
    Join Date
    Nov 2003
    Posts
    4
    I believe the unit outside is a/c only and has been off since the end of summer. The A-coil in the furnace is in the basement below the freon lines. I can insulate the line, however, will that only cover up a real problem?

  10. #10
    Join Date
    Jul 2004
    Location
    midwest
    Posts
    2,868
    Is this a new A/C unit and is the furnace in a basement?

  11. #11
    Join Date
    Nov 2002
    Location
    emerald city, sc
    Posts
    1,469
    Originally posted by jgerwitz
    I believe the unit outside is a/c only and has been off since the end of summer. The A-coil in the furnace is in the basement below the freon lines. I can insulate the line, however, will that only cover up a real problem?
    there is no real problem. the condensation is coming from the migration of refrigerant caused by the changing temp of the evaporator coil. other than insulating the line, the only other option is installing a solonoid valve on the liquid line. when your furnace runs it acts like the flame on an absorption system.
    i wanted to put a picture here

  12. #12
    Join Date
    Feb 2005
    Location
    Dothan, Al
    Posts
    3,453

    Jeff

    Yes, insulating lines is just temporary cover-up to possibly save ceiling until proper repair is made. At least that what I took it to be.
    You have puzzling problem. I'm sure many are trying to help solve it.

    Does the return air being drawn into your system going through the cooling coil first and then the funace, or is the air going through the furnace before it goes through the cooling coil ??

  13. #13
    Join Date
    Jul 2004
    Location
    midwest
    Posts
    2,868
    Originally posted by tlcartman
    Originally posted by jgerwitz
    I believe the unit outside is a/c only and has been off since the end of summer. The A-coil in the furnace is in the basement below the freon lines. I can insulate the line, however, will that only cover up a real problem?
    there is no real problem. the condensation is coming from the migration of refrigerant caused by the changing temp of the evaporator coil. other than insulating the line, the only other option is installing a solonoid valve on the liquid line. when your furnace runs it acts like the flame on an absorption system.
    Can you explain why I have two systems exactly the same and only one is doing this? So far the factory techs can't tell me what is causing this.

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