The Marriott Luhrs Residence Inn Courtyard is located in downtown Phoenix and has 19 floors with 320 rooms. We installed a mechanical system consisting of a 4-pipe chilled water system and a central plant. The system includes three 250-ton water-cooled chillers, natural boilers, water-to-water heat exchangers, and vertical in-line pumps. We also installed a dehumidification system for the pool room. Everything is connected to an Energy Management System (EMS) Control system that is wired to thermostats for control.