The AU and AR compressors are made in 1/2, 3/4, 1, and 1-1/4 hp sizes. They are used primarily for air-conditioning units. Most of the models use R-22, except for a few models that use R-134a or its equivalent substitute. A 30-oz charge of oil is standard, except in one of the 1/2-hp models. Because of such exceptions, you must refer to the manufacturer’s specifications chart to obtain the information relative to a specific model number within a series.
