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  1. #1
    Join Date
    Feb 2011
    Location
    Georgia
    Posts
    191

    furnace burner???

    http://www.facebook.com/video/video....ideo_processed[/video]

    had this one last night. inlet pressure is 6.9 and outlet pressure is 3.45. i cleaned the burners but the only one dirty was the first one that is rolling back at start up. cleaned orifices. still has roll back at start up. i did notice when i was turning the furnace on and off to check it, that if i didnt let the inducer completely stop before turning it back on it wouldnt have roll out. what do yall think?

  2. #2
    Join Date
    Jun 2012
    Location
    Rising Sun, Maryland, United States
    Posts
    110
    did you inspect the heat exchanger?

  3. #3
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,164
    did you clean the pilot orafice ?

    its like the gas valve is opening too slow

    can you swap burners around ??

  4. #4
    Join Date
    Aug 2012
    Posts
    2,645
    check the amp draw on inducer fan motor.
    My name is TooCoolforschool and I am a chronic over charger.

  5. #5
    Join Date
    Feb 2011
    Location
    Georgia
    Posts
    191
    Amp draw was .9 name plate 1.7

  6. #6
    Join Date
    Oct 2011
    Location
    Toronto
    Posts
    35
    That is strange, make sure to share the outcome. Never know when youll come across something like this

  7. #7
    Join Date
    Feb 2011
    Location
    Georgia
    Posts
    191
    I do remember the valve took about 2 or 3seconds to get to 3.45. Is that normal or is it usually immediate

  8. #8
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,164
    I believe I heard they do make valves that are slow openers , i dont know enough about them to tell you anything , but if one got installed into that furnace on accident , it will act similar to what you are seeing

    If the pilot flame is Not big enough it could do that , or make a Whoosh sound

    Some are a real pain to diagnose

  9. #9
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,855
    Delayed ignition. Check the runners on the burners. Make sure they are spaced enough. Was the valve replaced?

  10. #10
    Join Date
    Jul 2009
    Location
    Columbia, MD
    Posts
    3,855
    Let the furnace run for 5 minutes. Turn off gas valve, let flame go out, turn it right back on and see if it lights normal

  11. #11
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    3,164
    Quote Originally Posted by gravity View Post
    Let the furnace run for 5 minutes. Turn off gas valve, let flame go out, turn it right back on and see if it lights normal
    ahh .... you are bypassing the valve this way , checking to see if valve is opening too slow , good idea !

  12. #12
    Join Date
    Feb 2011
    Location
    Georgia
    Posts
    191
    valve was not replaced. it was original

  13. #13
    Join Date
    Feb 2011
    Location
    Georgia
    Posts
    191
    it will light normal because the inducer i still running. it lights normal when i cut the switch off and back on before the inducer has time to completely stop.

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