Re: boiler

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Posted by mike on February 20, 2000 at 18:34:34:

In Reply to: Re: boiler posted by Rick Bullard on February 11, 2000 at 09:46:24:

: : Today we had a boiler that had the o2 go from 4.2 to 9.2,also the sides of the boiler started pulsating. it was pulling about 40000. We have Preferred Instruments Controls.Any Help ?

: The increase in O2 indicates an increase in excess air. I'd check the FD and/or ID fan controllers or the oxygen trim controller if you have O2 trim. The furnace was pulsating from an excessive amount of fuel-gas being carried through it.

also check your safeties on feed water heater to make sure they are not drawing in air! thsi is were O2 might be coming in!

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