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Contact Information: Bret Nickels 2900 4th Ave. North Billings, MT 59101 406-247-7084 Bret.Nickels@mail.ihs.com Activity: Mechanical Keyword: Chillers Background: Only one chiller was ever online, the #2 chiller never came online. The chillers were piped in parallel, and the water from the two chillers mixed before re-entering the building. These chillers were designed to run together, but were being controlled as a primary unit and a redundant unit. So as chiller #1 cooled the water, chiller #2 heated it back up. Lessons Learned: Sometimes the subcontractors for individual systems do not ensure that their system is working correctly with other systems to accomplish the overall design objective. Recommended Action: Verify that subcontractors are not only strictly following their own specs, make sure the systems they are working on are compatible with all other systems in the facility. Location: Lame Deer, MT Program: OEHE/AFM Date: 08/24/2001