Question 185Steam Plants - 1st Asst/Chief
70% to passWhile trying to light off a burner on a semi-automated boiler, you note that the fuel oil solenoid valve at the burner will not stay open. Which of the following conditions could cause this problem?
AThe flame scanner is adjusted for excessive time delay in the ignition trial circuit.
BThe forced draft air supply has failed.
CThe fuel oil pressure at that burner is too high.
DThe solenoid coil is energized causing the valve to remain closed.
AI Explanation
The correct answer is B) The forced draft air supply has failed. If the forced draft air supply has failed, the lack of air flow would prevent the burner from lighting off properly. Without sufficient air, the fuel oil solenoid valve would not be able to stay open, as the burner requires the proper air-fuel ratio to ignite and maintain combustion. The other answer choices are incorrect because: A) The flame scanner issue would not directly impact the solenoid valve's ability to stay open. C) High fuel oil pressure would not prevent the solenoid valve from opening. D) If the solenoid coil was energized, the valve should open, not remain closed.
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