An O&M manual is a document that provides detailed information about the operation and maintenance of a particular system, such as a building, machine, or process. It is a comprehensive guide that outlines the specific procedures and processes necessary to ensure the system is functioning properly and efficiently. The manual typically includes diagrams, schematics, and other visuals to help users understand the system and its components. Additionally, it includes detailed instructions on how to perform maintenance tasks, troubleshoot issues, and replace parts. An O&M manual is an essential resource for anyone responsible for the operation and maintenance of a system, as it provides the information needed to ensure the system is functioning properly and safely.