When testing the low water fuel cut-off, what condition must the boiler be in?

When testing the low water fuel cut-off, the boiler must be in operation to accurately assess the functional integrity of the safety device. The low water fuel cut-off is a critical safety component designed to prevent the boiler from operating when there is an insufficient water level. If the boiler is not in operation, it would not simulate the actual operating conditions where the low water cutoff would need to engage in the event of a low water scenario.

Testing this device while the boiler is running allows for a real-time evaluation of how the system responds to low water conditions, ensuring that the cut-off engages as intended to prevent potential overheating and damage, which could lead to dangerous situations. This practice is essential for ensuring compliance with safety standards and safeguarding both personnel and equipment in boiler operations.