York International Corporation. The Group's principal activity is to design, manufacture, sell and service heating, ventilation and air conditioning systems for residential and commercial markets. The Group operates through four business segments. Engineered Systems Group manufactures air-cooled and water-cooled chillers, and control equipment to monitor and control the entire system and provides maintenance and service. York Refrigeration Group produces screw and reciprocating compressors, gas compression systems and automated plant control systems and provides refrigeration contracting, maintenance and service. Unitary Products include ducted central air conditioning and light commercial heating and cooling equipment. Bristol Compressors manufactures reciprocating and scroll compressors. Engineered systems accounted for 48% of 2002 revenues; Refrigeration products, 23%; Unitary products, 18% & Bristol Compressors, 11%.