单项选择题
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
Ignition failure in an automatically controlled auxilia...
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
Heavy soot accumulations in an auxiliary boiler could b...
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
The purpose of the programmed purge cycle on an automat...
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
