New York Low Pressure Boiler Certificate of Fitness (COF) Practice Test

What is the purpose of a low water cutoff?

1. Shut down when pressure is too high

2. Shut down when water level is below a safe point

3. Detect abnormal flames

4. Indicate water temperature

The correct answer is: Shut down when water level is below a safe point

The purpose of a low water cutoff is to ensure safe operation of a low pressure boiler by shutting down the boiler when the water level drops below a predetermined safe point. This is critical because if the water level falls too low, it can lead to overheating and potential damage to the boiler, as well as creating a hazardous situation. The low water cutoff acts as a safety device that prevents the boiler from running dry, thereby protecting both the equipment and the overall system. Low water cutoffs are essential components in steam and hot water heating systems, as they help maintain proper operation by monitoring the water level. If the boiler were to continue operating without sufficient water, the heating elements could become exposed and cause severe damage or even result in a failure or explosion. While the other answer choices mention functions like shutting down due to high pressure, detecting flames, or indicating water temperature, these do not pertain to the specific safety role of a low water cutoff. Instead, those functions relate to different safety measures and monitoring protocols within a boiler system.