單項選擇題

Ignition failure in an automatically controlled auxiliary boiler could be caused by（）

A.carbon deposits on the flame scanner
B.high fuel oil temperature
C.low fuel oil viscosity
D.high steam pressure

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單項選擇題

Heavy soot accumulations in an auxiliary boiler could be caused by（）

A.water in the fuel oil
B.excessive cycling
C.high fuel oil pressure
D.improper burner maintenance

單項選擇題

The purpose of the programmed purge cycle on an automatically fired auxiliary boiler is to（）

A.cool the furnace to prevent pre-ignition
B.remove explosive vapors from the furnace
C.evaporate accumulated unburned fuel oil
D.provide sufficient air in the furnace to allow ignition of the fuel