Frick rotary screw ammonia compressor, RXB-50, model XJS120S1760D. Uses R717 refrigerant. Capacity 100 tons of refrigeration. Motor 125 HP. Built 1990, compressor head new in 1999. Equipped with a thermosiphon to cool the oil. - run time 19,899 hours. 3600 rpm, 350 psig. Has hollow shaft for ammonia cooling. Built 1999. Approx. physical size: 4 ft w x 8 ft long x 6 ft tall. Part of Winterizer System 4366