Responsible on a shift for the operation and maintenance of a combined high-pressure heating and central refrigeration plant - OR - in a very large facility, has responsibility on a shift for assignments which include either the operation and maintenance of a high-pressure heating plant or refrigeration plant - OR - is assigned to a geographic area of major multi-hospital medical center which requires maintenance and operation of steam reducing stations, ventilation and refrigeration equipment, and various mechanical and electrical equipment and controls. One (1) year of classroom training from a trade school, college, a branch of military service, or other equivalent accredited school in the operation, maintenance, and repair of refrigeration equipment, combustion controls or industrial controls equipment, boilers, or water treatment systems related to power plant operations, in any combination, may be substituted for one year of the required special experience.