Maintain, install, alter, and/or repair air distribution systems, exhaust and supply fans, variable frequency drive systems, pneumatic and other control systems, air compressors, vacuum pumps, fan coils, evaporative condensers, electrical circuits, electrical motor control centers, and heating equipment; Charge refrigeration systems with refrigerant, check operation, and adjust for leaks; Respond to emergency calls, locate and determine cause of equipment malfunctions, analyze problems and take corrective steps to repair or replace equipment as needed; Inspect and test equipment; replace worn air filters, belts, blower wheels, shafts, bearings, relays, fuses, switches, condensers, thermostats and other equipment parts. Inspect motors and checks load amperage and static pressure in system, lubricate bearings, flush and re-insulate lines, clean equipment for maximum efficiency; Maintain cold rooms and warm rooms, check temperature settings, inspect and replace equipment as needed; Prefabricate and install piping or air distribution systems, repair and replace valves and fittings; Install, repair and replace water, gas, vacuum and compressed air and waste lines; Interpret blueprints, drawings, layouts or other specifications to determine installation or repair requirements; Interact with TSRI personnel, utility companies, contractors and vendors to evaluate, plan and coordinate work.