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We inherited a customer for service that has a W/M UO-3 with a Beckett NX. Here is the short of the story:
This boiler continues to soot up like we have never seen, almost every 6 months to the day. This has been an ongoing problem for 3 years. We have only been servicing it now for approx. 18 months.
Here is the tale of the tape:
burner set up and running as per OEM specs- to the letter & verified
all settings and combustion results are within normal range, after servicing and cleaning, then we follow up about 90 days later, still good and all seems great.
Then 90 later, soot like we can't believe.
The combustion air supply is more than ample and clean.
The chimney is a ss lined with a rain cap- also it is cleaned annually.
Fuel supply is clean, no vacuum problems,.
We are not having any "usual" nx burner problems associated with the end cone, the entire gun looks like new every time. No carbon deposits.
Now when I say, we have checked, re-checked and re-checked again EVERYTHING, we have.
We have pretty much ruled out fuel problems, combustion air issues, exhaust issues,
burner setup problems, we looked for any possible environmental contamination from anything in the vicinity of the unit (paints, chemicals, etc.)
Maybe you guys can help us out here, the three of us here are just out of ideas to solve this. Short of putting an OEM Riello burner on, which I may need to add is not an option for our customer, but that's a different story.