The Chiller Technicians install, modify and repair refrigeration systems such as: hermetic, semi-hermetic, screw and scroll units to 500 tons; air conditioning; VAV and ventilation; VRF systems; CRAC units; geo-thermal; reversible chillers; air and water-cooled chillers; process coolers; ice machines; evaporative cooling; air compressing and related control systems, including pneumatic, DDC, and building control systems equipment. This mechanic may perform complex repair of systems component such as compressors, condensers, heat pumps, fluid and refrigerant gas lines, valves, meters, gages, thermostats, pumps, mechanical linkage, electrical components, switching and controlling devices including pneumatic controls, variable speed drives, digital controlled devices, hydronic heating, cooling and economizer systems.