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  1. #1
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    Oct 2002
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    gas smell - dont understand

    Confused by this.
    Have a attic system. The supply vents register high natural gas levels and it smells like it. Likewise, flue has high levels.
    I read zero on the co detector and cannot find NG level anywhere at the burners. I also checked the attic and short return ducting for any gas. None.
    I guess I have a bad heat exchanger, but I would expect a high reading on CO, not NG. Flame looks good.

  2. #2
    Join Date
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    Quote Originally Posted by timjimbob View Post
    Confused by this.
    Have a attic system. The supply vents register high natural gas levels and it smells like it. Likewise, flue has high levels.
    I read zero on the co detector and cannot find NG level anywhere at the burners. I also checked the attic and short return ducting for any gas. None.
    I guess I have a bad heat exchanger, but I would expect a high reading on CO, not NG. Flame looks good.
    What is the CO level in the flue?

    Is the CO reading Stable?

    Does the CO continue to rise on Shutdown or decrease to zero?

    Do the O2 levels change when the blower comes on?

    Model Number of this unit please.
    Instead of learning the tricks of the trade, learn the trade.

  3. #3
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    Thread Starter
    O2 Oxogen??.

  4. #4
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    Quote Originally Posted by timjimbob View Post
    O2 Oxogen??.
    Yes. O2 percentage from a combustion test.

  5. #5
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    Thread Starter
    "Does the CO continue to rise on Shutdown or decrease to zero?" What is the significance of this question?

  6. #6
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    Quote Originally Posted by timjimbob View Post
    "Does the CO continue to rise on Shutdown or decrease to zero?" What is the significance of this question?
    Tells you if the gas valve is leaking after shutdown.

  7. #7
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    Thread Starter
    Wouldn't I want to check combustion gas level, not CO?

  8. #8
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    Quote Originally Posted by timjimbob View Post
    Wouldn't I want to check combustion gas level, not CO?
    Doing both would be prudent.

  9. #9
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    Aug 2002
    Location
    Cincinnati, Ohio
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    How did you measure gas in the flue? What testers are you using?
    captain CO

  10. #10
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    Thread Starter
    used fieldpeice combustion gas meter a foot from the termination. Real high.

  11. #11
    Join Date
    Aug 2002
    Location
    Cincinnati, Ohio
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    Fieldpiece does not make a natural gas leak detector. What is the model #?
    captain CO

  12. #12
    Join Date
    Oct 2002
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    Thread Starter
    Infocon Gas-mate and fieldpiece scm4

  13. #13
    Join Date
    Aug 2002
    Location
    Cincinnati, Ohio
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    Is the furnace running when you detect gas in the flue? Any chance there is some type of battery charger in the house?
    captain CO

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