What is interlock control in the context of boilers?

Interlock control is a crucial safety mechanism in boiler systems that ensures safe operation by preventing the boiler from functioning under potentially hazardous conditions. This system checks various safety parameters and conditions before allowing the boiler to ignite or operate, thereby mitigating risks such as pressure buildup, temperature exceedance, or failure of key components.

For example, interlock controls may include sensors that detect whether the pressure levels are safe, whether water levels are within the required limits, or if there are any operational failures. If any of these safety checks indicate an unsafe condition, the interlock system will prevent the boiler from starting or will shut it down, ensuring that the operational environment remains safe for both the equipment and personnel.

The other options focus on different aspects of boiler operation. While regulating fuel flow, controlling heat output, and balancing air and fuel ratios are important operational functions of a boiler, they do not encompass the primary function of interlock control, which is fundamentally centered on safety assurance.