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How a Trane Water Cooled Chiller Works RTWD units are screw compressor chillers. The RTWD unit consists of an evaporator, two screw compressors (one per circuit), oil separators, liquid line service valves, sight glasses, electronic expansion valves, and filter. The discharge line coming out of the oil separator and the liquid line going into the filters are capped and welded. #chillers #hvac #trane