Monitor the operation and make adjustments on refrigeration, heat exchanger, HVAC, electrical, emergency backup systems and hot water systems; monitors operation, adjusts, and maintains refrigeration, chilled water, and air conditioning equipment; boilers, and ventilating and hot water heaters; pumps, valves, piping and filters; other mechanical and electrical equipment; record readings and make adjustments where necessary to assure proper operation of equipment. install and rebuild pumps and motors; install and rebuild air compressors; heat exchangers; replace bearings in all types of motors; replace seals on pumps; install and repair piping, valves, filters, hot water systems and associated controls; assist other mechanics and operators with major repairs and maintenance of building and equipment.