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Thread: 3-4 round ceiling water spots near the vent closest to the air handler

  1. #1
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    3-4 round ceiling water spots near the vent closest to the air handler

    My 25yr old inside Rheem air handler is in the closet on ground floor, not the attic. My condensation drain was badly clogged and flooded the floor beneath the handler in the closet. I had a tech come out and fix the clog and clean my unit as well, but I really couldn't get a definitive answer whether that condensation drain clog could of caused the water spots. I thought maybe the air handler might have lifted up some of that water & moisture and caused the 3-4 water spots now on my ceiling by saturating the insulation around my duct work? I know this is a lot of info but I'm at my wits end. I'm in SW Florida. Any ideas would be appreciated.
    Thanks

  2. #2
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    Condensation, But not because the drain plugged. Air, as it leaves the indoor coil is at 100% humidity. That coil is, by design, below dew point. Common to see supply registers that are very close to the air handler rust from the excess humidity.

  3. #3
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    Thread Starter
    Quote Originally Posted by theoldscroll View Post
    Condensation, But not because the drain plugged. Air, as it leaves the indoor coil is at 100% humidity. That coil is, by design, below dew point. Common to see supply registers that are very close to the air handler rust from the excess humidity.
    Appreciate the suggestion. Yes i've seen metal vents sweat to the point that they do rust, but 2 of these 3 water stained ceiling spots are 6"-12" round, and are all in a row following the path of the duct work across the ceiling. I think the duct work is sweating, why I don't know. I've looked at the duct work in that area and they look well insulated with no tears or splits. very puzzling

  4. #4
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    As you are a homeowner and not a technician, your post belongs in the Ask Our Pros forum. Click on the little black triangle below your post and request that it be moved.
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  5. #5
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    Quote Originally Posted by quintas View Post
    Appreciate the suggestion. Yes i've seen metal vents sweat to the point that they do rust, but 2 of these 3 water stained ceiling spots are 6"-12" round, and are all in a row following the path of the duct work across the ceiling. I think the duct work is sweating, why I don't know. I've looked at the duct work in that area and they look well insulated with no tears or splits. very puzzling
    Reaching the dew point is what causes condensation. You need to reduce humidity in the attic and perhaps raise the temperature in the ducts
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  6. #6
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    Define what "cleaning the unit"means? Was the blower wheel cleaned? How about the evap coil ? A 25 year old system has to be dirty, which lowers the airflow which drops the air temp which leads to duct condensation.

  7. #7
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    I think you've got it TechmanTerry! This unit was unbelievably filthy! Never saw an evap so packed with huge clumps of slimy wet dust globs and God only knows what else, you couldn't even see the fins. This debris completely covered the entire "W" evap coils. The tech spent 30 mins just cleaning it on his back with Nitrogen, brushes, vacuum, blower, and other stuff.
    Your synopsis sounds logical. My extremely dirty evap lowered airflow, dropped the temp, and caused duct condensation which dripped onto my ceiling. I'll be watching those wet spots on the ceiling the next few days, and if they do dry out, i'll know that was the problem

  8. #8
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    The tech spent 30 mins just cleaning it on his back with Nitrogen, brushes, vacuum, blower, and other stuff.

    If he didnt use cleaner and water its still dirty!

  9. #9
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    Like I stated he used quite a few things, including a spray can of some sort of evap cleaner and compressed air. There is no more clog, no more water leakage, and no accumulation.

  10. #10
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    As pecmsg said “it’s still dirty”.

  11. #11
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    Forgive me but I'm a bit confused,,,,,,,He did use a cleaner, so are you saying that because he didn't use water along with that cleaner that the evaporator is still dirty?

  12. #12
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    N2, vacuum, brushes do nothing but clean the surface and push the dirt in. Spray cleaners are more cosmetic then anything else.
    Coil cleaner and water. If the coil is that bad remove and wash. Was the squirrel cage cleaned?

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