ARLINGTON, VA — The General Standards Committee of the Air-Conditioning and Refrigeration Institute (ARI) has approved and released an addendum to ARI Standard 550/590-1998, “Standard for Water Chilling Packages Using the Vapor Compression Cycle.”
Standard 550/590-98 combines two previously separate standards: ARI Standard 550-92, “Centrifugal and Rotary Screw Water Chilling Packages,” and ARI Standard 590-92, “Positive Displacement Compressor Water Chilling Packages.” In 1999, ARI’s Large Tonnage Liquid Chiller Product Section voted to combine the two standards to reduce confusion in equipment application and ensure consistent treatment for rating and testing of two similar and overlapping product lines.