What is the purpose of a manual reset in boiler systems?

In boiler systems, a manual reset is primarily used to secure fuel in the flame scanner. This function is crucial for safety and operational integrity. When certain unsafe conditions are detected, such as a flame failure or a malfunction, the flame scanner sends a signal that leads to a shutdown of the fuel supply. This manual reset feature ensures that an operator must physically verify and confirm that it is safe to restart the boiler.

The requirement for manual intervention helps prevent the boiler from automatically turning back on in hazardous situations, thereby reducing the risk of accidents or explosions. It serves as an added layer of protection, confirming through human oversight that all systems are functioning properly before allowing the burner to reignite.

The other options do not accurately describe the role of a manual reset in a boiler system. Initiating boiler startup, measuring water quality, and adjusting temperature settings fall under different operational controls and automated systems that may not necessarily require a manual reset.