Successful completion of a US Department of Labor registered apprenticeship program in Heating, Ventilation and Air Conditioning; or five (5) years of commercial HVAC or refrigeration experience, including experience with low pressure chillers; or an equivalent combination of education and experience from which comparable job knowledge can be acquired as determined by Ball State University. Maintain and operate central chilling plant equipment, geothermal heat pump chillers, fluid coolers, cooling towers, and the chilled and hot water distribution system, including large tonnage centrifugal chillers, heat pump chillers, air dirt separators, distribution pumps, and associated control systems.