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Lennox venting questions

Post in 'It's a Gas!' started by MoeB, Nov 15, 2008.

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  1. MoeB

    MoeB New Member

    Joined:
    Apr 4, 2006
    Messages:
    82
    Loc:
    Bangor, Maine
    I'm looking for advice about venting a new condensing natural gas furnace. Last week I had a new furnace installed and it's not working well. It works okay for a little while. Then the blower starts blowing cool air. My installer initially believed there was a condensate drain problem because when he'd open it up, it would work again. Now they're thinking it may be the venting. They're going to change the vent pipe from a two inch to a two and a half inch today.

    Setting aside whether this will work or not for the time being, I am concerned that all the condensation will rot my sill. The venting comes through a cellar window below ground level right under the sill and then comes out and up. Would it better to vent it out the chimney, which is fairly new and lined, with the required PVC pipe all the way up? This would alleviate the concern about the sill rotting. I have a very old house -- 1833 cape. How much trouble is it to go right up the chimney?

    Thanks in advance for any advice.

    Moe

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  2. tubbster

    tubbster Member

    Joined:
    Aug 12, 2008
    Messages:
    127
    Loc:
    Central NY
    I'm confused. My condensing furnace has a drain where the condensate goes into a pump to the sewer.

    Did they not hook up a condensate drain?
  3. MoeB

    MoeB New Member

    Joined:
    Apr 4, 2006
    Messages:
    82
    Loc:
    Bangor, Maine
    Yes, the condensate drain is working and so is the venting. We did a few minor adjustments, and now it's working like a dream. The exhaust was not pointing straight out. It is now. Thanks for responding.

    Moe
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