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Thread: LOUD DRIPPING - A/C condensation drain behind the wall

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  1. #1
    DIY Senior Member jeff_bathroom's Avatar
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    Default LOUD DRIPPING - A/C condensation drain behind the wall

    Hi,
    I wasn't sure whether to put this thread in the plumbing forum or not. Seems to me that HVAC folks should
    know how to deal with this issue. I went into the attic last night and followed the pvc pipe from the air handler
    to what looks like an open 1 1/2" pipe starting at the floor of the attic going down the bathroom wall and probably
    connecting to the vanity sink drain at some point. There appears to be a p-trap about 2 1/2 feet down from the attic
    floor which would be about head height standing in the bathroom below. The drainage pipe I think is 3/4" diameter and sticking
    about 18" down the drain pipe and I think the ptrap is about 2 1/2 feet down. The drip is very loud. We can hear it easily
    in the living room.
    So, that's the problem. I would think a good way to have set this up would be a slight bend above the ptrap like maybe 22 degrees,
    then the trap , then reverse the 22 if necessary, but probably no need if set up that way to begin with. I don't want to cut into
    the wall though. So, how to solve this problem? I thought of fashioning something flat just below the 3/4" pipe to divert the drips
    to the side of the pipe, but it would have to fit fairly flush with the side of that 1 1/2" drain pipe in order not to just roll off the
    end and again drip into the pool of water in the ptrap. I'm guessing there is some other clever way to fix this.
    Making the problem possibly a little more difficult is that after that a/c drain was established, then the plumber ran the bath vent
    pipe horizontally across the top of the horizontal a/c drain pipe in the attic to the roof. So, the a/c pipe cannot be pulled out completely
    from the drain unless I cut it somewhere. Suggestions?

    Thanks.

  2. #2
    DIY Senior Member jeff_bathroom's Avatar
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    Bump. Wish it were a coffee maker?
    Surprised nobody's got a fix for this one.

  3. #3
    DIYer, not in the trades LLigetfa's Avatar
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    Pictures might help. I don't know how you would access the pipe down in the stud bay without cutting into the drywall.

    Maybe you could go in from the top with an inside pipe cutter and then glue in an offset with two matched elbows. They can be had in a variety of angles (11-1/4, 22-1/2, 33, 45). That would cause the water to hit the sloping pipe instead of the standing water.

    Maybe you could soften the pipe with a heat gun and put an offset bend in it. Don't burn down the house.

  4. #4
    DIY Senior Member jeff_bathroom's Avatar
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    I was hoping there was some method to redirect the water to the side of the drain pipe so that
    it would drizzle down into the ptrap. I was hoping not to have to cut the drain pipe. If I had to cut the smaller
    a/c drain pipe to make a modification to the end of it, that would be preferable. I'll take a photo in awhile.
    Seems I read that someone else that had this problem ran the a/c drain all the way into the water in the ptrap,
    but that ended up making the water suck upwards into the a/c drain pipe. Some kind of fluid physics that I don't understand.

  5. #5
    DIY Senior Member jeff_bathroom's Avatar
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    Name:  P1000859.jpg
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Size:  25.9 KBName:  P1000858.jpg
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Size:  25.4 KB
    Attached are a couple photos. One shows where the a/c drain goes down into the drain pipe.
    About 2 1/2 to 3 feet below the top of that black drain pipe is the p-trap.
    The other photo shows the bathroom vent pipe going over the top of the white a/c condensation
    drain pipe such that I cannot pull that drain pipe completely out of the black drain pipe.
    Hope that makes sense.

  6. #6
    DIYer, not in the trades LLigetfa's Avatar
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    If you have enough fall on the 3/4" drain, you could raise it up and glue a 45 elbow on the top of the 1.5" drain. The water should then dribble down the side of the pipe and not make dripping sounds.

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