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Horn sound on low fire on TT 110
in Gas Heating
So, I had my gas valve replaced after the tech detected gas during a cleaning. However, the smell is still there and now I am getting this low fire horn sound. It goes away as soon as the burner ramps up. I am assuming it's a combustion issue since the valve has been replaced. Any thoughts? I have reached out to the tech and am awaiting his response. I have video of the sound, the horn sound starts at around the 35 second mark. Thanks in advance.
Oops. Forgot to post a link
It can be the combustion mixture. And since it appeared after a gas valve change it makes sense.
See if they will cone out and adjust it0
What did you have for combustion readings after the valve change and adjustment of the throttling screw?
What is you inlet gas pressure?
Is this LP or natural gas?
Has anyone taken a Combustible Gas Detector and determined exactly what is givng off the odor of gas.0
From tech email "Supply pressure and 2nd stage reg supply pressure is 11 to 14"wc, manifold pressure on unit down stream of gas valve is 10"wc."
As far as the horn sound, he called tech support and was able to make an adjustment on the gas valve and the sound went away.
Hi fire numbers are co2 10.9%, 95.3% eff, 78
Ppm Co, oxygen 4.4 %, 103.1 temp stack, 24.3% oxygen
Low fire Co2 8.4%, 97.6 eff, 7ppm CO, oxygen 8.2%, 58.7% excess air
As far as gas smell detection, it was on and off when he placed
It near the Venturi, as soon as the wind picked up, the detector beeped, and when it didn't, the detector stopped. possible that wind works its way up
The exhaust and out through the intake??
thanks in advance0
And it's LP0
Ignore everything but the O2 and CO numbers (and the stack temp if it is really weird).
The rest of it is calculated by the analyzer and of little real value.
Your low fire O2 is way out of spec. I have found this to be the culprit of many trombone solos."If you can't explain it simply, you don't understand it well enough"
Thanks zman. What should the O2 be? I can't find the specs for low fire.0
It will vary a bit by manufacture. I believe triangle tube wants it within 10% of the high fire numbers."If you can't explain it simply, you don't understand it well enough"
So my o2 is about 50% higher than the number at high fire. So if it gets adjusted at low firing rate, wouldn't that change the combustion numbers at high fire? And now, those numbers are within spec. What about the efficiency ratings? Do they not mean anything or just not accurate? Thanks in advance0
These are the readings required according to the I and O manual from Triangle Tube.
On Propane the readings should be O2 min 2.7%, O2 max 4.7%, CO2 min 10.7%, CO2 max 12% and CO 100 PPM0
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