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  1. #1
    Join Date
    Nov 2008
    Posts
    7

    Please help me understand...

    Hi,

    I posted this question in my wall of shame thread, but thought I get better respond here. So if I violate any double-post rule please forgive me and delete this thread.

    The "wall of shame" thread: http://hvac-talk.com/vbb/showthread.php?t=190822

    This is referring to my installation which you guy can view here:
    http://picasaweb.google.com/kqalbum/...at=directlink#

    The question is:

    Can you guy help me understand the problem with drawing combustion air from attic vs. outside? What the effect of trap water in 3x2 adapter?

    Thanks.

  2. #2
    Join Date
    Jun 2001
    Location
    Louisville, KY
    Posts
    12,189
    If you don't have adequate ventilation, the attic will go negative. then, you will draw air from the house.

    Water trapping in that reducer can cause the pressure switch to not make. Then, you got no heat.
    Perhaps you should have read the instructions before calling.

  3. #3
    Join Date
    Nov 2008
    Posts
    7
    Thanks for the quick reply.

    I'll see if I can ask the contractor to vent out directly without the adapter. Also to take in fresh air.

  4. #4
    Join Date
    Jan 2004
    Location
    Burleson, Texas
    Posts
    1,741
    Can you get some more pics of the drains? IMO, the two drains need to be seperate, if possible....

  5. #5
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,761
    Quote Originally Posted by khoile View Post
    Thanks for the quick reply.

    I'll see if I can ask the contractor to vent out directly without the adapter. Also to take in fresh air.

    adapter is ok to have it just needs to be in the vertical pipe so it cannot trap water.

    venting should also be insulated in unconditioned space.

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