The project involved replacement and addition of key components of the entire HVAC system in two phases while the building remained occupied. The Phase 1 project task includes the installation of fan-coil units with chilled water piping, condensate pumps and piping, and controls. Tasks included hot-tapping existing the building chilled water system to ensure no downtime to building. Additional tasks include removal and installation of the air distribution system including grills, dampers, insulation, and supports. Work included coordination of project controls, testing and balancing. Phase II involved the installation of two (2) 225-ton air-cooled chillers with connection of 6-inch chilled water piping (including two 15 HP, 450 GPM pumps with variable frequency drives). Tasks included new air handlers, outside air units, fan coils and CRAC units with associated chilled water piping. Work included installation of supply and return metal duct work, variable air volume units and air devices, dampers and supports. Work included coordination of project controls and testing and balancing of the entire facility.