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Thread: Dry is ...

  1. #1
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    when the AC ran for 1.5 hours yesterday and not one drop of condensate came out the pipe.

  2. #2
    Join Date
    Apr 2006
    Location
    Nebraska
    Posts
    115

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  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,712
    Originally posted by Panama
    when the AC ran for 1.5 hours yesterday and not one drop of condensate came out the pipe.
    Or the drain line is clogged.
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    How many times must one fix something before it is fixed?

  4. #4
    Join Date
    Jul 2004
    Location
    Poughkeepsie, Ny
    Posts
    631
    Originally posted by Panama
    when the AC ran for 1.5 hours yesterday and not one drop of condensate came out the pipe.
    Check the secondary drain line?
    Check you coil, Is your coil a block of ice?
    Check your pressures?
    Check your SH or SC?
    Check the drain line, is it cracked somewhere in line?
    Check the filter(s)
    Check check check... Is this thing on?

  5. #5
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    Line is clear and everything is OK. Indoor RH yesterday afternoon was below 30% even before the AC came on. Outdoor RH was about 10% most of the afternoon.

  6. #6
    Join Date
    Jan 2005
    Location
    Central Fl
    Posts
    49
    What was the dew point of the indoor air? What was the saturation temperature of the refrigerant?

  7. #7
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579



    In order for moisture to condense on the coil the coil temperature must be at or lower than the dew point temperature of the air.

    Using a psychrometer measure the wet and dry bulb temperatures of the air and find the stat point on a psychrometric chart. Then, plot the dew point of the room air and compare it to the coil temp.

    The coil temp must be the same or lower than the dew point temp of the air for condensation to occur.



    [Edited by NormChris on 04-16-2006 at 12:55 AM]

  8. #8
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    The indoor dew point was about 38F.

  9. #9
    Join Date
    Nov 2004
    Location
    SW FL
    Posts
    6,234

    Right

    Originally posted by Panama
    Line is clear and everything is OK. Indoor RH yesterday afternoon was below 30% even before the AC came on. Outdoor RH was about 10% most of the afternoon.
    I didn't know Panama would be that dry in April.

    at 10% R.H., A/C is not needed < 100'F.



    Designer Dan
    It's Not Rocket Science, But It is SCIENCE with "Some Art". ___ ___ K EEP I T S IMPLE & S INCERE

    Define the Building Envelope and Perform a Detailed Load Calc: It's ALL About Windows and Make-up Air Requirements. Know Your Equipment Capabilities

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