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stevetheplumber

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Nov 25, 2008
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its no secret that i realy dont understand fga readings, yes i know the action levels and i can compare what ive got to the manufacturers recomendations
but im seeing condensing vaillants that chuff out 180 ppm co and old turbomax non condensers in the 30/50 ppm i thought the new ones were supposed to be better
 
its no secret that i realy dont understand fga readings, yes i know the action levels and i can compare what ive got to the manufacturers recomendations
but im seeing condensing vaillants that chuff out 180 ppm co and old turbomax non condensers in the 30/50 ppm i thought the new ones were supposed to be better






had a new vaillant with a vertical flue knocking out 130 ppm last week,today a 13 year old ideal classic at 37ppm
 
They belt out more co because the combustion is forced and cooled , older ones the combustion is at high temp and an abundance of air as it's negative pressure (combustion sucked out)?

Do an fga on a clean Myson Apollo bf. Co might not even register
 
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Its the ratio between CO & CO2 which counts. These older appliances may have less CO but also less CO2 which results in similar ratio's.
 
But they're not. The CO reading from the Fga isn't the whole story. You need to look at the excess air as well. The total CO from the old BF boiler will possibly be higher. To get a true comparison you need to look at flue gas emissions versus gas burnt.
 
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