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Thread: Condensation lines

  1. #1
    DIY Junior Member sneezye's Avatar
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    Default Condensation lines

    Would it be abnormal for an HVAC unit to have two condensation lines? I have two 3/4" pvc lines (one from each side of the unit) running down from my attic to the crawlspace under the house.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    From what I hear, this is not abnormal...one is for the primary drip pan, the second is the emergency or secondary pan. If you ever walk by, you'd normally only see water coming from one. If you see it from the other, you have a problem, and it is time to fix it before you have a flood, ruining your ceilings and maybe walls and floor as well.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Junior Member sneezye's Avatar
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    and the next question...

    IF that were the case, could they be combined into 1 pipe?
    I am moving the pipes and would prefer to wye them together to avoid having 4 pipes running through my closet (the other two being the WH T&P and overflow). Not that 3 is that much better...

  4. #4
    Plumbing Designer FloridaOrange's Avatar
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    No, you cannot connect them to one pipe.
    If you want to get rid of the secondary you should have a float switch installed (if possible with your existing arrangement) which would turn the unit off at a predetermined level in the pan.
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    The whole idea of a secondary line is it is an entirely separate path, so if one has problems, the other can take up the slack.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    DIY Junior Member sneezye's Avatar
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    Alright. I will leave it as it is. It's better to find things correct than to find things... well, messed up. Thanks, guys.

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