Must have the skill and knowledge necessary to install, maintain, troubleshoot, and repair a wide variety of air conditioning and refrigeration systems including circulating air and chilled water air conditioning systems, high, medium, and low temperature refrigeration systems, and total environmental control systems. Skilled in the use a variety of tools, test equipment, and close tolerance measuring devices such as voltmeters, ammeters, multimeters, vacuum and acid pumps, pressure gauges, serviceman's thermometer, humidity recorders, micrometers, calipers, and soldering equipment.