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  1. Urgent..heater problem!!..

    I have a miller heater...beckett af-15....I had a techician come to service heater and he adjusted air intake plate on side....I know he added more air to system I believe..he had put nozzle .65 (80)B NOZZLE....I changed it to a .50 (80)AS SOLID and burner turned on for a couple hours and now...