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  1. #1
    Join Date
    Jan 2013
    Location
    Southern Connecticut
    Posts
    3

    New Ruud 2 stage 95% exhaust vent VERY NOISY

    This week my HVAC contractor upgraded my old oil furnace to a new 95% Ruud 2 stage heat/cool variable speed gas furnace. The unit itself is whisper-quiet compared to the old oil unit, but after about 15 minutes of running the exhaust vent starts gurgling and popping from condensation getting blown around from the power vent. Intake and exhaust are both stepped up from 2" to 3" at the unit, the pitch is good, the run is about 20' total in length and there are 5 short radius 90's. My contractor has been back a couple times checking for any blockage in the drain goin from the trap inside the unit to the condensation pump, everything is clear and water is draining fine to the condensation pump. Also, the amount condensation is a lot. I don’t have a lot of experience with the 95+ efficient furnaces, and my contractor says everything is running the way it should. Is this noise normal? Here is a link to a video of the exhaust outside, where the noise is loudest from it echoing through the 3" pvc. https://skydrive.live.com/redir?resid=9ADF4CB14AA96C52!1754&authkey=!ABDQzII A_4wK8a8

  2. #2
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,153
    75,000btu unit?
    ...

  3. #3
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,241
    Gurgling usually indicates a sag in the PVC exhaust. Should run uphill all the way to the exterior termination. How far does it run from the furnace to the outside? Check and make sure it is all uphill, no sags.

  4. #4
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,153
    Where the exhaust of the furnace exits the cabinet and the PVC vent connects,, there will be a plastic flange with (2) screws you can see it on the top. The pvc vent will slide into this. Is this connector piece white or black?
    ...

  5. #5
    Join Date
    Nov 2006
    Location
    Athens, Ohio
    Posts
    1,834
    Are the drain tubes in the furnace all draining properly? An upward slope will trap water in the collector box or secondary heat exchanger.

  6. #6
    Join Date
    Jan 2013
    Location
    Southern Connecticut
    Posts
    3
    Quote Originally Posted by kangaroogod View Post
    Where the exhaust of the furnace exits the cabinet and the PVC vent connects,, there will be a plastic flange with (2) screws you can see it on the top. The pvc vent will slide into this. Is this connector piece white or black?
    Both the exhaust and the intake have 2 inch white flanges coming from the unit.

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  7. #7
    Join Date
    Jan 2013
    Location
    Southern Connecticut
    Posts
    3
    The exhaust vent has over a 1/4 per foot pictch back to the unit. The total span is about 20 feet from the unit to the exterior. The exhaust is draining to the condensation pump but it almost seems like the volume of condensation is overwhelming for the 1/2 rubber drain hose inside the unit that migrates the water to the condensation pump.

  8. #8
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,241
    Never heard that gurgle noise unless there was a sag in the PVC flue. They can product a lot of water but the hoses can handle it. That model has been out nearly 19 years, I put in a few of the test models including my sister's house. Can't get a much better furnace.

  9. #9
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,589
    Could it be water In the inducer or is it gurgling out in the vent system? Is the furnace tilted forward slightly?

  10. #10
    Join Date
    Aug 2001
    Location
    Pavilion, NY
    Posts
    2,153
    Tell your contractor to focus his attention on the white exhaust outlet tube. I cannot give DIY advice sorry. That is the reason I asked if yours was white or black as they have a different design. The unit may need to be "modified" and your issue will be resolved.
    ...

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