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Oil Furnaces Questions and Answers
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You come across an oil furnace that has a tripped primary control. You should
A) reset the primary controller and attempt to fire the burner. B) not reset the primary control, and attempt to view the firepot for pooling oil. C) reset the primary control, but do not attempt to fire the burner. D)
not reset the primary control, and attempt to view the heat exchanger for pooling oil. ✔✔The answer is NOT RESET THE PRIMARY CONTROL, AND ATTEMPT TO VIEW THE FIREPOT FOR POOLING OIL. You should be looking for pooling oil in the firepot. You should not reset the primary control. This may contribute to flooding the firepot.
All of the following are common oil supply line problems except
A)
undersized. B) corrosion or mechanical damage. C) excess elevation change. D) leak. ✔✔The answer is EXCESS ELEVATION CHANGE. Excessive elevation change is not a common oil supply line problem. A fuel filter is needed in this arrangement.
All of the following are common vent connector issues on oil furnaces except
A) poor connection to chimney. B) poor support. C) poor slope. D)
B)
C)
D)
72%. ✔✔The answer is 87%. The maximum steady state efficiency for an oil burner is about 87%.
The primary control on a modern flame-retention head oil burner is typically found
A) on the furnace cabinet. B) on the exhaust flue. C) on the heat exchanger. D)
on the burner. ✔✔The answer is ON THE BURNER. The primary control is on the burner on a retention head system.
Oil flows from an above ground exterior tank through a 2-inch pipe into the basement. Here it passes a shutoff valve and a union. The 3/8-inch copper line starts here and runs to the burner. What is missing?
A) A manifold to allow oil to be drawn off for other burners B) A pump to increase fuel pressure in the exterior line C) A fuel pressure reducer D) A fuel filter ✔✔The answer is A FUEL FILTER. A fuel filter is needed here.
The heat content of one gallon of No. 2 heating oil is approximately
A)
blast tube. ✔✔The answer is BLAST TUBE. The blast tube is a component of oil furnace burners but not gas furnace burners.
What is the purpose of the primary controller in an oil furnace?
A) It is a high-temperature limit. B) It cycles the house air blower. C) It cycles the burner. D) It prevents oil accumulation in the combustion chamber. ✔✔The answer is IT CYCLES THE BURNER. The primary controller is an automatic safety device installed on every oil furnace to shut off the burner if the flame is out.
The viewport shows that the back wall of the ceramic felt combustion chamber is no longer white. It is browned and stained. What is the likely cause of this discoloration?
A)
Saturation of the ceramic felt with oil B) The felt will turn this color with time and use C) The heat exchanger has failed and is leaking creosote onto the firepot D)
Soot from a dirty flame ✔✔The answer is SATURATION OF THE CERAMIC FELT WITH OIL. A ceramic felt combustion chamber that is brown and stained is probably saturated with oil.
Common problems with oil fill and vent pipes do not include
A) missing caps. B) abandoned. C) leaks.
air to escape from the tank when the tank is filled. B) the oil supplier a second pipe through which to fill the tank. C) oil vapors to vent out of the tank on a hot day. D) an overflow condition to dump oil back outside. ✔✔The answer is AIR TO ESCAPE FROM THE TANK WHEN THE TANK IS FILLED. The oil vent pipe allows the air in the tank to escape during filling of the tank.
What is the typical residential oil burner pump pressure?
A) 10 psi B) 80 psi C) 2 psi D)
200 psi ✔✔The answer is 80 PSI. The oil burner pump pressure is in the range of 75 to 100 psi, so 80 psi is the best answer among the choices in this question.
