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  1. #1
    Join Date
    Dec 2005
    Posts
    3

    Hmm

    I just had a new furnace installed by a professional company. It is an Amana 95% with a stainless heat exchanger. Since it was installed I have noticed a gurgling / popping noise coming from the pvc exhaust pipe outside when the furnace is running. I called contractor who installed it and he told me that it is just condensation in the pipe and it is completely normal. The last house i owned had a 92% furnace and I never heard this noise. Also, is it good to have condensation in the pvc exhaust pipe? I thought that was why the small pvc pipe was routed, to drain the condensation into the drain.
    Can someone help ease my mind about this noise?

    Thanks a lot!!!

  2. #2
    Join Date
    Feb 2005
    Posts
    655
    Make sure PVC venting is pitching back towards furnace.

  3. #3
    Join Date
    Dec 2005
    Location
    Newton, NJ
    Posts
    299
    Amana...built better than it has to be. You paid extra for the technology to make those noises.

  4. #4
    Join Date
    Feb 2005
    Posts
    344

    Gurgle-gurgle

    Check the PVC pipes for any sags that could trap water. Then as mentioned in another post, be sure the pipes are sloped back to the furnace.

    If it doesn't look right, get the installing contractor back
    on the job. They might appreciate your feedback.

    Best regards...

  5. #5
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,607
    That probably is normal, especially if Amana drains its PVC flue into the inducer as opposed to a Tee like Rheem does.

  6. #6
    Join Date
    Nov 2000
    Location
    Eastern PA
    Posts
    68,981
    Nahhh, it should not be making those noises. On the types of installs were condensate will go back through the induced draft blower there should be a special bypass coupling installed. This would only apply to a horizontal mounted furnace with a left side discharge.

    It really sounds like either air is getting into the condensate line between the furnace and the condensate trap assembly, the trap assembly is not being utilized or there is water trapping in a horizontal section of the venting.
    Government is a disease...
    ...masquerading as its own cure…
    Ecclesiastes 10:2 NIV


  7. #7
    Join Date
    Dec 2005
    Posts
    3

    gurgling & popping in new furnace (2)

    Thanks for the info. I checked the furnace, and there is a slope in the exhaust back towards it. The slope is a little greater than 1/4" per foot of exhaust run. The pipe is not sagging at all (the exhaust pipe is one piece with one pipe inside the other). The install looks good as far as I can tell. The furnace is mounted normally not horizontally. Any other ideas???

    Thanks a lot!

  8. #8
    Join Date
    Apr 2002
    Posts
    11,808
    Does your partner post as Snow Dog?
    The way we build has a greater impact on our comfort, energy consumption and IAQ than any HVAC system we install.

    http://www.ductstrap.com/

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