My A/C coils are in my attic, and while changing the filter recently I noticed water dripping from the seam where the metal coil box connects to the plenum which is a foam box where all my duct runs connect. The builder's HVAC company said this might be because the plenum/coil box is not level and water could be going over the drain pan edge and then leaking at the seam. Does this seem correct? It seems that the metal at the seam itself is getting condesation on it.



Another issue is that the spots where the duct runs connect To the plenum are getting condensation on them and dripping on the attic floor outside the drain pan. Apparently there's a metal ring at that duct junction that's getting cold and forming condensation. Is this fixable by adding more sealing compound around the junction to insulate, or this just sloppy installation that should be redone a different way?

Any HVAC people on here seen something Iike this and know the solution?

It is getting cold and humidity is condensing on it and dripping. To fix it fix the cold air leak and or reinsulate

Dill-Ag13 said:

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It is getting cold and humidity is condensing on it and dripping. To fix it fix the cold air leak and or reinsulate

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They came out to fix the leveling of the unit today because they said it should have had two cinder blocks under it. However they put the second cinder block in a different orientation, and it is not centered in the middle (back to front). Should they have put the cinder block such that the hollow space was not showing to give it more load bearing ability?

TexAg1987 said:

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Thunderstruck xx said:

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Should they have put the cinder block such that the hollow space was not showing to give it more load bearing ability?

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That unit is not going to exceed the capacity of that block. As long as it is level, I wouldn't worry about it.

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Good to know. I actually measured it just now, and at the left cinder block the unit is at 7 5/8 inches above the drain pan, but the right cinder block is at 7 3/8 inches above the drain pan. Not sure if 1/4 inches out of level is good enough?

I'm going to monitor it for another week to see what happens.

Put a level on the unit itself.
Pan may be tilted to drain.

Could also be a cracked primary condensate pan, just went through this on an older Trane system.