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Thread: A/C drain line trapped in series with tub trap

  1. #1
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    Default A/C drain line trapped in series with tub trap

    We're in the middle of an apartment remodel and just set the tub and noticed some popping/gurgling noise coming from the drain. A few days ago the indoor A/C unit leaked around the pan and the plumber removed the existing trap at the unit. Prior to removing the trap, we located the drain line connected to a tee that went to the tub trap. Apparently it's double trapped and either overflowed the other day or leaked enough around the drain pan to cause the carpet to get wet hence the reasoning behind removing the A/C drain line trap but in doing so caused the aforementioned noises. The plumber did fix a small hole in the drain pan so I requested to have the trap reinstalled and after some hesitation and a little arguing it got put back in and all is well again. Is there potential for this drain to back up or would the tub drain at worst just suck the water out of the A/C drain line trap?

  2. #2
    In the Trades Wally Hays's Avatar
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    Under no circumstances can you drain an AC line into a septic line.
    Perception is 3/4 of reality

  3. #3
    Moderator & Master Plumber hj's Avatar
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    quote; Under no circumstances can you drain an AC line into a septic line.

    Oh, Oh! Now you've done it. You have made ALL those installations where the City REQUIRES that the condensate drain be connected to the sewer system, ans NOT drain onto the ground, ILLEGAL. I guess that means we will have to put heaters on them and evaporate the water. Draining to the tub's connection AHEAD of the trap is perfectly okay, in fact there are overflow fittings made with a 3/4" tap to connect the condensate drain to them. It gives them TWO traps, but does NOT make them double trapped.

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    In the Trades Wally Hays's Avatar
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    should have been a bit more clear. If it dumps into the drain line it has to be through an air gap or an air break.
    Perception is 3/4 of reality

  5. #5
    Master Plumber-Gas Fitter shacko's Avatar
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    Quote Originally Posted by Wally Hays View Post
    should have been a bit more clear. If it dumps into the drain line it has to be through an air gap or an air break.
    Thats the only code I know about condesate drains, it must be indirect and not tied in solid

  6. #6
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    Thanks for the replies, I'll wait and see if any problems arise from this setup.

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