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I assume this is no bueno

TheStressMachine
TheStressMachine Member Posts: 50
in Carbon Monoxide Awareness
1000000759.jpg

The meter isn't professional by any means, but this doesn't seem right. Before I make a call, just want to gut check with pros that this is an unacceptable level of CO in a Navien tankless heater exhaust. I've read that some can be present but this seems high.

Comments

  • TheStressMachine
    TheStressMachine Member Posts: 50

    Forgot to mention exhaust piping is nice and sealed so no leakage in the house, CO detectors sit above any gas appliance I have.

  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,389
    edited April 6

    While not a huge number, it's concerning. It should be serviced with a flue gas analyzer and someone that knows how to use it and adjust the air/gas mix as necessary.

    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
    mattmia2TheStressMachineGGross
  • HVACNUT
    HVACNUT Member Posts: 6,718

    It should say right in the manual the maximum level.

    mattmia2Ironman
  • TheStressMachine
    TheStressMachine Member Posts: 50
    https://forum.heatinghelp.com/discussion/comment/1851306#Comment_1851306

    I'm usually an RTFM guy, but this didn't occur to me for some reason. I'll go track one down. Thanks for (always) being helpful.

    Alan (California Radiant) Forbes
  • Dave Carpentier
    Dave Carpentier Member Posts: 626

    I thought you can trash a CO sensor by doing that ?

    30+ yrs in telecom outside plant.
    Currently in building maintenance.
    Mad Dog_2
  • Ironman
    Ironman Member Posts: 7,713

    Is this natural or LP gas?

    If the number is out of spec, then the heat exchanger probably needs cleaning and a combustion analysis done.

    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • mattmia2
    mattmia2 Member Posts: 12,479

    If my limited understanding of combustion is correct, you can get the same O2(electronic analyzers convert O2 to CO2) percent with too little air or excess air. If you are on the too little air side you are making a lot of CO so you could get good CO2 numbers but still have it wrong.

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