b5a5d860_for_any_fuel_gas_fired__boiler__Item
[Safety] The control system drives the burner main natural gas control valve to "low" flow when the main flame is to be lighted. [Reason] The pilot flame is much smaller than the main flame and may be unable to light the main flame if fuel gas is flowing at maximum rate. [Item] 
Low Fire To Light the Main Flame
Safety controls for any fuel gas fired  boiler
Item