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  1. #1
    Join Date
    Dec 2012
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    columbus, OH
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    Ever seen a drain like this?



    Now guess what the two top ones are for..


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  2. #2
    Join Date
    Dec 2012
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    Thread Starter
    another pic


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  3. #3
    Join Date
    May 2013
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    If I remember right that was supposed to put positive pressure air into the drain. I had to do something like that once years ago thought it was the dumbest thing

  4. #4
    Join Date
    Dec 2012
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    columbus, OH
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    I suspected it had some “purpose” maybe? Both “extra” drain lines are one the return side of the system. Just stubbed into it.

    Only thing i can picture it doing is the one after the trap is sucking in air.


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  5. #5
    Join Date
    Nov 2011
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    East Side
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    it's supposed to be a "trapless" drain.....it should allow water to drain without a trap installed.....if it's installed right. saves freezing and breaking drain lines in cold climates.

    I've never seen one in person, but the theory is supposed to be sound. I'd like to experiment with it.....

  6. #6
    Join Date
    Dec 2012
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    Thread Starter
    ill have to get the model numbers and look at the installation manual, how is it suppose to be installed?

  7. #7
    Join Date
    May 2014
    Location
    Bay Area California
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    Hmm, I'm curious about that trapless drain also.
    If you were a real tech, you'd solder a relay on that board and call it good to go.

    I do a triple evac with nitro to remove non condensables.

    I use 56% silver on everything except steel.

  8. #8
    Join Date
    Sep 2002
    Posts
    24,572
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    Natural Gas ?

    PHM
    -----------



    Quote Originally Posted by Core_d View Post


    Now guess what the two top ones are for..


    Sent from my iPhone using Tapatalk
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  9. #9
    Join Date
    Jul 2018
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    Wisconsin
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    The two on the right would be negative the one on the right would be positive and in the heat exchanger section. Makes no sense to me.

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  10. #10
    Join Date
    Nov 2011
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    East Side
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    I doubt you’ll find anything in the unit installation manual. I tried to research this a year or so ago, there’s not really much info available.

    The positive pressure from the discharge side is supposed allow for an almost equal pressure in the drain line, allowing it to drain.....like I said, the theory is sound, but I’ve never seen one in person.

  11. #11
    Join Date
    Dec 2012
    Location
    columbus, OH
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    Thread Starter
    Actually both stubbed in “vent pipes are on the negative pressure side of the system. The one on the left before the trap is right by the blower and the one past the trap is by the tube sheet, both in the same air space/compartment.

    It is not a gas furnace, its a heatpump with one indoor coil.

    Tough to see but here is the one by the tube sheet.


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  12. #12
    Join Date
    Aug 2015
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    COSTGARD. Theyre pretty common in florida. Trap never clogs up

  13. #13
    Join Date
    Mar 2016
    Location
    Pahrump, NV
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    Quote Originally Posted by Jmiami View Post
    COSTGARD. Theyre pretty common in florida. Trap never clogs up
    I looked at the CostGuard information. Their system doesn’t use a trap, and one of the lines is on positive pressure side. That doesn’t look like what is being used here.
    It's an upside down world we live in.

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