Combustion analysis question

Dave Yates (PAH)

Aside from O2, CO2, CO, draft, smoke test and net stack temp in the breech, why would a CO2 reading "over the fire" make sense? Seems to me that a reading taken there won't add anything of substance and may well be dilluted by free air.

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jim sokolovic

It could tell you...

if there is significant leakage around the boiler sections and flue collector. The CO2 in the breech would be the diluted reading, in that case?

Rudy

Getting accurate stack readings

Yep, you might want to take an O2/CO2 reading over fire (with the opening sealed with aluminum foil or something) and compare it to the stack readings.

I've found that in a tight system the stack reading will normally be about 1/2% higher.

Any more difference than that indicates that there is alot of 'tramp' air being sucked in though cleanout ports, access doors, etc. and the stack reading is not accurate.