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Have new, Burnham V905A steam boiler as supplied with Carlin 201 CRD oil burner. Did assemble exactly per manual. Very impressed with overall quality and completeness of kit. Per the Carlin manual did set Air band at 95%. Seemed to run well. Had fuel vendor send their burner technician to confirm operation with a combustion analyzer. Advised best results with approximate 20% air band opening. Within a week furnace was rumbling badly spewing soot all over the room. Then would not stay running. I returned the air band to initial 95% opening and it seemed to run well. Had technician return to diagnose. Was unable to explain failure, reset air band to 20% and invoiced me a 2nd time. Now, 2 weeks latter is spewing soot and shutting down. Questions are, is the Carlin manual incorrect? Isn't huge amounts of soot due to rich fuel mixture? How do I screen for a competent oil burner technician?