Multistack, a manufacturer of modular chillers in Sparta, Wis., has received California certification for its MS chillers. Units that have passed the testing procedure by the California office of Statewide Health Planning and Development Pre-Approval Certification include the MS10X, MS15X, MS20X, MS30X, MS50X, MS70X, MS105X, MS135X, MS145X, MS165X and MS80T.

By achieving certification, Multistack's MS water-cooled chillers are in compliance with ASCE 7-05 Chapter 13. The testing required to meet the standards is considered by many to be the most rigorous in the United States, and often it is viewed as the default standard for products used in healthcare, educational and civic institutions, according to the company.

Multistack's MS modular line includes dual-compressor units, its recently developed dual-tandem compressor models and the MagLev-equipped modular chiller line. Applicable dedicated heat-recovery chiller modules also are covered by the certification.