Which of the following must be included in the inspection prior to operation of a boiler?

The inspection of controls and safety features is critical prior to the operation of a boiler to ensure safe and efficient functioning. These components are vital in preventing malfunctions that could lead to hazardous conditions. By inspecting the controls, operators can confirm that they are functioning correctly and capable of regulating the boiler's operations, including temperature and pressure controls. Safety features, such as pressure relief valves and emergency shutdown systems, are essential for protecting both the equipment and personnel in the event of an emergency or abnormal operation.

In contrast, a visual examination of the exterior may overlook critical internal components and controls that influence safe operation. Relying solely on user manuals would not address the condition of the equipment or verify that all safety features are operational and compliant with regulations. Similarly, inspecting only similar equipment would not provide a comprehensive understanding of the specific boiler being operated, as each unit may have unique features and requirements. Thus, the inspection of controls and safety features is an indispensable step that ensures safe operation and compliance with safety standards.