Oil Furnace Troubleshooting Exam Questions and Answer 100% Pass

What is the size of an air vent on an oil storage tank? - ANSWER-1 1/4" What safety feature is used on an inside oil storage tank that will protect against a house fire? - ANSWER-a fuse-type globe valve What effect, if any, would a decrease of primary air have on combustion? - ANSWER-It would increase CO2 percentage What effect if any would an increase in primary air have on combustion? - ANSWER-It would decrease CO2 percentage If an oil has a high viscosity - ANSWER-It is a thicker oil under low temperatures What type of system uses a single-stage fuel oil pump? - ANSWER-An aboveground one-pipe system What type of system uses a two-stage fuel oil pump? - ANSWER-An underground two-pipe system When a cad-cell is located in the light - ANSWER-Its resistance is below 1,500 ohms of resistance When A CAD cell is located in the dark, it's resistance is - ANSWER-above 100,000 ohms of resistance The orange wire on a cad-cell relay is used to? - ANSWER-Feed line voltage to the burner motor The number 3 terminal on the stack mount relay is used to - ANSWER-connect the burner motor circuit to the relay What is the purpose of the barometric damper used on an oil-fired furnace? - ANSWER-It controls the draft through the system What is the most common size oil line used on a residential oil-fired furnace? - ANSWER-3/8" OD What type of lubrication should be used in the burner motor of a high-pressure gun burner? - ANSWER-10-weight nondetergent-type oil What is the purpose of a delayed oil valve? - ANSWER-It delays the oil pressure to the nozzle How is the delayed oil valve wired in a heating circuit? - ANSWER-It is connected across terminals 2 and 3 on a stack mount relay What are three products produced in the combustion process? - ANSWER-H20, CO2, and N A high CO2 reading in an oil-fired furnace indicates? - ANSWER-A hot fire A common CO2 measurement for an oil-fired furnace is from - ANSWER-10-12% A common CO2 measurement for a gas-fired furnace is from - ANSWER-8.5%-9.5% A common fire draft reading for an oil-fired furnace would be? - ANSWER--0.01" to -0.02" WC A common breech draft for an oil furnace is? - ANSWER--0.03" to -0.06" WC