Operate and maintain water chillers, cooling towers, pumps, heat exchangers, air handling equipment, fans, automatic temperature controls, electrical switch gear, distribution switch boards and panels, sprinkler systems, fire alarm systems, valves, plumbing fixtures, and other mechanical and electrical equipment and systems in buildings. Wear fall prevention/protection equipment when working at heights over 4 feet in areas without guardrails, or when performing other non-ladder work at elevations, or when working in permit-required confined spaces where retrieval equipment is required, including but not limited to body harness and lanyard in addition to other required Personal Protective Equipment.