What term describes the manipulation of fuel and air controls by remote manual means in automatic boiler controls?

The term that best describes the manipulation of fuel and air controls by remote manual means in automatic boiler controls is commonly referred to as remote sensing control. This type of control allows an operator to manually adjust the fuel and air mixture from a distance, ensuring that the automatic boiler functions efficiently and safely.

Remote sensing control incorporates various sensors and manual inputs that enable adjustments based on real-time data, thus optimizing the combustion process. It is essential in maintaining operational efficiency and responding dynamically to changes in load or fuel quality.

In contrast, the other terms listed would not adequately represent the concept described. For example, automatic control refers to systems that operate without manual intervention, electronic control typically involves using electronic components for automation processes, and two-knob control is not a standard terminology used in the context of boiler control systems.

Understanding how these systems function and their classifications is crucial for effective operations and maintenance in boiler management.