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burner chamber extremely hot...keeps tripping rollout-90% bryant

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DDSM31
DDSM31 Member Posts: 3
my chamber extremely hot,verified clear f/a pipe. Stack temp 97 degree (seems low) but running eff 90%.co2 0ppm

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  • DDSM31
    DDSM31 Member Posts: 3
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    O2 4-5%...any thoughts????
  • DZoro
    DZoro Member Posts: 1,048
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    Is that model involved with the bad H/E's. They had a series of bad secondary's plugging up and failing.
    Your CO2 reading was O?
    Or was your CO reading O?
    D
  • SuperTech
    SuperTech Member Posts: 2,186
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    Stack temperature is 97 degrees but you are only at 90% efficiency? I think your combustion testing equipment needs recalibration. I somehow doubt zero ppm CO. If you are rolling out flame it's time to get a good look at the heat exchangers.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,624
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    @DDSM31 ,

    Shut the furnace off and let it cool off for an hour or so. Start it and look at the flame with the main blower off. Keep watching the flame when the main blower starts, if the looks of the flame change you have a cracked HX
  • mikeg2015
    mikeg2015 Member Posts: 1,194
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    We’ve had a lot of these Carrier/Bryant furnaces with rollout as you found. Can’t prove it’s a bad heat exchanger, but also unable ot fix the situation, so to be safe, we’ve condemned them. Most were oversized running at or above max temp rise or just in poor condition from being in wet basements.... rentals with dirty blowers, rusted out cabinets, holes from years of leaking or plugged condensate lines.... all the usual.

    One was so bad, that a poorly glued joint popped off and nearly killed the family. Pegged the meter at 1900+ ppm CO at the exhaust, I think it was 300+ indoors. Unit probably ran for year with very high temp rise and flooded secondary.
  • DDSM31
    DDSM31 Member Posts: 3
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    I have since found that it was indeed a bad heat exchanger(secondary) which was clogged due to a coating from manufacturer degrading.Carrier is replacing these under a service bulletin. Thanks for feedback and hope this helps someone in the future.
    DZoro
  • SuperTech
    SuperTech Member Posts: 2,186
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    Yeah, this is well known issue with their condensing equipment. I service a neighbourhood that isn't ten years old yet and I had to condemn three so far this season due to bad secondaries and dangerously high CO output. It's a shame because I generally like most of their stuff.