Understands and has mastered all types of HVAC systems and how each component within the system operates in conjunction with the other components and how that impacts the overall operations of the system as a These systems include but are not limited to air cooled, water-cooled, hot water systems, chilled water systems, VAV systems, steam heating systems, and building automation control systems. Understands and has mastered the refrigeration cycles to include: identifying components in advanced refrigeration circuits, understanding how each component works, diagnosing and correcting problems in the refrigeration circuit, using manifold gauge set, pressure/temperature chart, and temperature measuring devices for routine maintenance and to troubleshoot.