When can a one-pipe oil delivery system be used successfully?
A) When using a low firing rate burner
B) When the burner is at or below the level of the oil tank
C) Only when the oil burner has single firing rate
D) When the burner is above the tank and must lift the oil
Question 2
The oil safety valve will not open until
A) The draft switch closes
B) The oil pump produces a pressure in the supply line
C) The oil pump produces a vacuum in the supply line
D) It is energized by the primary burner control
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