With many small package boilers, the automatic control sequence usually ensures that the boiler fire...

With many small package boilers, the automatic control sequence usually ensures that the boiler fire is
initially ignited from a diesel oil supply, and changed over to the usual source when ignition is completed.
With good management, to facilitate subsequent starting from cold, the fuel system of large boilers will
have been flushed through with diesel oil when the boiler was on light duty immediately prior to being
secured. When burning such diesel fuel it is essential for safety that only the correct (small) burner tip
should be used. It should be kept in mind that if fire does not light, immediately shut off fuel and vent furnace.
Complete ignition of fuel in the furnace is essential. The burner flame, the smoke indicator and the
funnel should be frequently observed. With satisfactory combustion, the flame should appear in candescent
（白热的）with an orange shade at the flame tip, and a faint brownish haze should show at the funnel. If on
first ignition the flame is uncertain, badly shaped and separates from the primary swirler, momentary
opening or closing of air register may correct.