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Boiler feed tank overfills
A customer has a job where he installed a Burnham V9A commercial boiler. He has 3 large motorized valves on the. There is a boiler feed pump (49 gallon) controlled by a McDonnell and Miller 150 pump control. The system is operated by a Vapor stat . Cut in is 4oz and out at 16 oz. After about 3-4 days usage the system overflows from the tanks vent pipe. This has been happening for 2-3 months since the boiler was installed. The customer thought it was the 150 pump control and that was not the case. I thought it might be a dirty boiler causing this and have instructed the contractor to clean this well. Any other thoughts