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Posted by boilerlady on September 26, 2010 at 21:51:47:
In Reply to: inverted O2 and CO2 readings posted by Paul on March 15, 2009 at 08:17:39:
: I have 3 Kewanee boilers and everytime we take emissions readings I notice that our O2 stats and CO2 stats seem to be inverted. Our CO is well within range, under 100ppm, as is our temps, under 400dF, but on low fire our O2 reads around 16 and our CO2 around 6. Shouldn't those readings be switched around?
: I am not a licensed operator, but I do supervise operators and I need to ensure what we are doing is correct.
Not sure what your boiler programming calls for but generally speaking at low fire limits you should have a ratio of 4:1 air to gas. This will ensure that you do not have unspent combustibles. The controls on the boilers that I operate have approximately 10% bias of FD fan speed/louvers from the flue gas O2 readings.
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