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  1. #1
    Join Date
    Jun 2009
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    Albuquerque NM
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    Question about condensate drains on heat pump systems

    I have a dual fuel system with upflow configuration so the coil is on top of the furnace. The heat pump isn't operational now, but the furnace is running and there is heat coming out of the condensate drain. In cooling mode the water in the p-trap will prevent this, but in heating mode there is no water in the trap. It's lost heat. Is there any way to stop this? Maybe a different condensate drain or p-trap configuration?

  2. #2
    Join Date
    Sep 2008
    Location
    lexington ky
    Posts
    19
    Shouldn't be enough to amount out of a 3/4 drain line. If nothing else, fill the trap through the drain pan in the coil

  3. #3
    Join Date
    Jul 2002
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    Zelienople, Pa
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    Fill the trap if you are concerned about losing 3 cfm...
    How tall are you Private???!!!!

  4. #4
    Join Date
    Feb 2010
    Location
    butler pa
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    1,073
    its not actually wasted heat..its going into your house...or just fill the trap

  5. #5
    Join Date
    Jun 2009
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    Albuquerque NM
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    Quote Originally Posted by pauls heating & View Post
    its not actually wasted heat..its going into your house...or just fill the trap
    Actually some goes into the garage (out the vent) and some goes out the wall. I guess the bugs and lizards will like hanging around the outside vent in the winter.

    I could fill the trap but it's so dry here it would probably have to be filled every day.

    Just wondering if there's a way to avoid the problem.

  6. #6
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    Jul 2002
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    Buy a couple 3/4" PVC caps and put them over the vent tee and end of the drain.

    Problem solved. Just remember to remove them for cooling season.
    How tall are you Private???!!!!

  7. #7
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    Jun 2009
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    Albuquerque NM
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    Quote Originally Posted by Gunnery Sergeant Hartman View Post
    Buy a couple 3/4" PVC caps and put them over the vent tee and end of the drain.

    Problem solved. Just remember to remove them for cooling season.
    That's an idea that might work all the time somewhere, and some of the time where I'm at. We have large day-night temperature differentials, and during some parts of the year a heat pump might be cooling during the day and heating at night (example: 55F night, 85F day).

    I was sort of looking for a passive solution that didn't rely on my memory or be dependent on the weather.

  8. #8
    Join Date
    Dec 2003
    Posts
    2,395
    http://www.jrsmith.com/products/floo...ttal/d2699.pdf

    Payback will be around 500yrs +/-.

  9. #9
    Join Date
    May 2010
    Location
    SF Bay Area, CA
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    390
    Quote Originally Posted by garya505 View Post
    That's an idea that might work all the time somewhere, and some of the time where I'm at. We have large day-night temperature differentials, and during some parts of the year a heat pump might be cooling during the day and heating at night (example: 55F night, 85F day).

    I was sort of looking for a passive solution that didn't rely on my memory or be dependent on the weather.
    motorized valve in the drainline? something like a hydronic zone valve? closed on heating call, open on cooling call?

  10. #10
    Join Date
    Jun 2009
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    Albuquerque NM
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    Doesn't someome make a "waterless trap"? Seems I saw one somewhere, a while back, but I don't recall where.

  11. #11
    Join Date
    Nov 2005
    Location
    Charlotte, N.C.
    Posts
    961
    It's insignificant, Why worry with it? Sit back and enjoy your new heat.
    Those who restrain desire do so because theirs is weak enough to be restrained. (William Blake)

  12. #12
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    Jun 2009
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  13. #13
    Join Date
    Jul 2002
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    Zelienople, Pa
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    Quote Originally Posted by garya505 View Post
    That's an idea that might work all the time somewhere, and some of the time where I'm at. We have large day-night temperature differentials, and during some parts of the year a heat pump might be cooling during the day and heating at night (example: 55F night, 85F day).

    I was sort of looking for a passive solution that didn't rely on my memory or be dependent on the weather.
    If it cools during the day, the trap will be filled with condensate when the heat runs at night.
    How tall are you Private???!!!!

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