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  1. #14
    Join Date
    Jul 2008
    Posts
    20

    here i am

    Quote Originally Posted by richmod View Post
    My plenum is sheet metal and is NOT insulated - should it be? Only the ductwork is insulated.
    the plenum is located in non-conditioned space it has to be insulated

  2. #15
    Join Date
    Jul 2008
    Location
    Alabama
    Posts
    658
    Quote Originally Posted by cnpro18 View Post
    What is the temp. diff between the supply and the return. Coil could be too cold.

    The dude has a uninsulated plenum in a crawl, its gonna sweat regardless of coil temp.

  3. #16
    Join Date
    Feb 2008
    Posts
    78
    Quote Originally Posted by cnpro18 View Post
    What is the temp. diff between the supply and the return. Coil could be too cold.
    Don't know - how would I measure it?

    Of coil is too cold, can that be adjusted on the AHU?

  4. #17
    Join Date
    Feb 2008
    Posts
    78
    Quote Originally Posted by thandar56 View Post
    the plenum is located in non-conditioned space it has to be insulated
    Is that a requirement? If so, I'll be sure to advise the tech as such.

  5. #18
    Join Date
    Jul 2008
    Posts
    33

    Angry

    Quote Originally Posted by superd77 View Post
    The dude has a uninsulated plenum in a crawl, its gonna sweat regardless of coil temp.
    Any uninsulated plenum in a non conditioned space is going to be creating a small flood, not just a little condensation. Sounds like it may be internally insulated and Mr. homeowner doesn't know any better. I've seen plenums sweat in conditioned spaces if coil is too cold due to some other problem.

  6. #19
    Join Date
    Jul 2008
    Posts
    33
    Quote Originally Posted by richmod View Post
    Don't know - how would I measure it?

    Of coil is too cold, can that be adjusted on the AHU?
    You would need to call a tech to come check it out.

  7. #20
    Join Date
    Jul 2008
    Location
    Alabama
    Posts
    658
    Quote Originally Posted by cnpro18 View Post
    You would need to call a tech to come check it out.

    If its cooling fine, chances are he's got a humid crawl.

    And yes , it probably is a duct lined plenum with a few air leaks.

  8. #21
    Join Date
    Feb 2008
    Posts
    78
    Quote Originally Posted by cnpro18 View Post
    Any uninsulated plenum in a non conditioned space is going to be creating a small flood, not just a little condensation.
    It's not just a little condensation - the whole plenum is covered with condensation, and there is actually a small pool of water under it now, though not a flood.

  9. #22
    Join Date
    Feb 2008
    Posts
    78
    Quote Originally Posted by superd77 View Post



    If its cooling fine, chances are he's got a humid crawl.

    And yes , it probably is a duct lined plenum with a few air leaks.
    I'm in North Carolina, so yep - pretty humid down there right now. And yes - it is duct lined - 2 zone ducts, bypass duct, and return duct.

    Tech's coming next week - thanks for all the info and opinions.

  10. #23
    Join Date
    Jul 2008
    Location
    Alabama
    Posts
    658
    Quote Originally Posted by richmod View Post
    I'm in North Carolina, so yep - pretty humid down there right now. And yes - it is duct lined - 2 zone ducts, bypass duct, and return duct.

    Tech's coming next week - thanks for all the info and opinions.
    Dude, you are totally welcome!!

  11. #24
    Join Date
    Apr 2006
    Posts
    81

    Original Poster

    My plenum is in the attic. It is insulated in the inside with insulation. I don't notice condensation all the time, just some times. Should I be concerned or does this just happen sometimes?

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