The Pre-Engineered Systems Group of C&R Mechanical Company recently completed four floors of computer rooms for MCI WorldCom in St. Louis. This retrofit project for the telecommunications industry was performed in the Valley Building, a two building attached structure built in 1927.

State-of-the-art Liebert systems were selected to provide the hvac needs for the critical controlled temperature in the computer rooms. Hvac and piping were installed for 20,000 sq. ft. of computer rooms on the lower level and floors four, six and seven. Approximately 800 tons of hvac was required.

As the building was originally constructed with reinforced concrete floors and support columns, a major retrofit activity was required to run piping from the rooftop chillers down to the three key floors and basement computer rooms.