单项选择题

Which action should be taken when an auxiliary boiler in is operation?（）

A.Clean all electrical connections
B.Lift the relief valves by hand
C.Inspect and clean all solenoid valves
D.Inspect for oil and water leaks

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单项选择题

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

单项选择题

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

单项选择题

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