The purpose of this position is to perform installation, maintenance, and repair of utility systems within a facility. Duties include work that is performed to repair and modify a variety of equipment and systems that achieve regulated climatic conditions and the work concerned primarily with operating air conditioning systems for large buildings or complexes of buildings. Installs maintains and repairs commercial and industrial systems and/or systems for areas with special requirements.

Work involves installing, recognizing the cause of faulty equipment and making repairs on large systems that provide for a variety of air conditioning functions such as heating, cooling, humidifying, dehumidifying, cleaning, filtering, and circulating. Installations and repairs are used to condition the air for different kinds of structures such as warehouses, ships, hangars, hospitals, submarines, and large office buildings. Works on a variety of commercial and industrial systems to locate and check elements such as those which control low side and high side pressure; the temperature of the cooling units; the temperatures of the liquid and suction lines; and the running time of the various mechanisms. Checks for the probability of leaks by visual and audible examination of equipment components; by applying prescribed test procedures and equipment; and by exploration of probable reasons for equipment failure. Uses principles and theories of 8.ir conditioning and refrigeration such as the refrigeration cycle, heat transfer laws, the use of refrigerant tables; how to calculate airflow, and the pressure-temperature characteristics for the different systems to troubleshoot, locate and repair faulty equipment swiftly and to reduce inoperative time to a minimum. Systems to work on include those with a variety of compressors such as gear, reciprocating, centrifugal, or rotary pump, and a variety of refrigerant controls such as those with low- high-pressure side floats, automatic thermostatic expansion valves, capillary or choke types, and those based on volume or quantity changes. A variety of complicated motor controls are also used such as hermetically sealed motors and pressure controls, thermostatic motor controls (remote and double remote), full and semi­ automatic defrosting controls, relays, and other controls to protect against overload or overheating. Various types of power sources are used with various combinations or pulleys, belts, horsepower capacity, and tensioners. Dismantles, repairs and reassembles units such as pumps, impellers, compressors, chillers, receivers, and evaporators. Installs and fits connecting rods, crank shafts, piston rings, bearings, and bushing; overhauling valves by adjusting or replacing gaskets, springs, floats, diaphragms, valve fittings, seals, and couplings; and aligning motors and flywheel drives. Plans test procedures.