How rich is too rich
Battling the HTP phoenix lite that I've named "tuba". Foghorns like a sonofa for the first 30 seconds or so after ignition. I tried all the usual suggestions and the only thing that works is throttling a little rich. It's out of spec though. Manual calls for 8-10% for low and high fire. I keep low around 8.5 for some excess air to keep the burner cool but high is closer to 11 if I want silence. Maybe a little more. CO stays well under 60 so I don't know if I should even care as it's more efficient combustion the higher that CO2 goes. I've searched and searched and nobody ever has a real answer to all the modcons that howl besides richen it up.
Comments
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co of 60ppm seems kinda high, you are probably on the low excess air side of the curve.
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I'm not sure where you operate out of, but in New York, the Natural Gas Utilities want CO flue #s under 50 PPM as a rule. Mad Dog
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Each manufacturer has their own specs on CO in the flue. Most want <100 ppm CO. Some like the NTI Trinity allow up to 175 ppm CO in the flue. Not saying its right, but…
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You probably aren't confused, but I've seen it enough times to feel a need for a caution: CO and CO2 are not the same thing. And in combustion work in general, CO will increase with a richer mixture, while CO2 will increase with a leaner mixture.
Another sort of useless general comment: sometimes you can get a resonant sound — like a tuba maybe! — from unstable combustion, but other times you can get a similar sort of sound by simply varying the air flow — and it may change as less air or more flows through. This can be altered by draught, for instance. Or of course any air shutters.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England1 -
Is any portion of the gas line CSST?
Bob Boan
You can choose to do what you want, but you cannot choose the consequences.
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This is certainly not Too Rich
Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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Only the 6" piece HTP uses inside their control panel. Completely hard piped.
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I agree but also hear comments like "anything below 100 is fine". What else can I do besides have the noise? And why does it only happen for that short time at ignition? You'll find 100s of these type of threads with a quick Google search but none of them ever seem to have a detailed, proven explanation. Some say pipe, some say vent, some say regulator, but when those items are changed it never seems to solve anything.
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Yes I'm on the right side 100%. I thought of that. The readings verify based on my gas adjustments. I'm between 3 and 4% O2 currently.
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Just a thought — but have you tried going way lean? Just enough fuel in the air to fire up? and then adjusting back richer? Until the CO2 peaks and the CO maybe beings to show an increase?
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Not sure what you mean. just to verify I'm on the right side of the curve?
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I thought for a minute there you were talking about the 15+billionaires in the cargill and mcvey families😀
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How many years before you can't plant corn in your garden without kicking up to them?
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any time i've planted corn in my garden i got an ear the size of a aa battery that was full of earwigs or rot
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yup
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
I have checked that. I am 100% sure I'm on the right side of the curve.
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If our CO is around 60, you are way too rich. End of story. Something is not adding up.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
Maybe I need my meter calibrated. I'll grab another and compare.
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Normally the horn noise indicates a rich mixure .
There was an error rendering this rich post.
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my uft-100 makes some occasional very faint foghorn like noises, i don't find it objectionable and i'm not sure it is abnormal.
the better question here is if you are on the left side, as you lean it out, does it stay ignited as it gets to the excess air side or does it go out and leave you with no way to adjust it?
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I gave them 22 years of my life and they gave me nothing back if that is what you are referring to.
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