Boiler Back fire
Possible Causes of Boiler Backfire.
? Improper tuning of the burner
? Accumulation of un burnt fuel left in the
furnace
? Air Fuel ratio disturbance
? Outlet damper partially/fully closed
? Purging time before and after burner shut
off not enough i.e. too short
? Flue gases outlet damper malfunction
? High flow from FD
? Low rpm of ID fan
? Repeated unsuccessful start attempts for
boiler firing
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