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What should happen when testing a low water fuel cutoff?

  1. The burner remains on regardless of water level

  2. The burner should shut off when water is visible

  3. The burner should operate continuously

  4. The burner should only shut off if the gauge glass is broken

The correct answer is: The burner should shut off when water is visible

When testing a low water fuel cutoff, it is crucial for safety and proper operation that the burner must shut off when the water level falls below a certain threshold. This mechanism is designed to prevent the boiler from operating without sufficient water, which can lead to overheating, equipment damage, and even explosions. The correct answer indicates that as soon as the water is no longer visible, signaling that the water level has dropped to an unsafe level, the burner should automatically shut off. This automatic response ensures that the system actively monitors water levels and protects the integrity of the boiler and the safety of operations. In contrast, the other options present scenarios that would be dangerous or incorrect. For example, allowing the burner to remain operational regardless of the water level or only shutting off if the gauge glass is broken does not prioritize safety or effective equipment management. Operating continuously without regard to water level could lead to catastrophic failures, making it vital for the low water fuel cutoff to engage precisely at the correct moment.