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Did a service on a Weil MClain boiler CGA-25-PIDN 52,000 btu's. As soon as I got there I noticed the flue had a lot of signs of condensation on it. When I checked the gas pressure it was right at 3.5", but the Oxygen was high at 11.2, and the C02 was low at 5.39 and stack temp was low at 280. I had to increase the pressure to almost 4.6 to get the O2 down, and the CO2 up, It went to 9.7 and 6.23. The stack temp went to 325f. Evrything is closer to where it should be when the pressure is higher, but is it exceptable to leave it this high? Obviously it looks like the flue gases are reaching its dew point when the pressure is at 3.5" and it is probably raining inside of th flue. The CO wasn't effected by the changes in gas pressure. It was between 2 - 4 ppm AF. Thank you.
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