The project object was the replacement of Cooling Towers, Pipes, Pumps and Low Voltage Fields in the central building’s refrigerator. Two water-cooled chillers were installed with SCREW compressors and paralleled to a Hydraulic Network, which was isolated from the rest of the installation. A cold water supply management system was installed in the building’s secondary network, adapting to the current building needs. This system consists of three Inverter controlled displacement pumps.To remove the air from the pipeline, an automatic degasser and a particle separator have been installed. The cooling coils were placed on the roof of the building in a parallel connection. In order to reduce the noise during the operating hours, noise traps were placed in the air inlet. Each Purgator has an Inverter-controlled centrifugal fan. The Cooling Tower circuit, as well as the entire air conditioning installation, is controlled by a Central Control System, which was designed and installed by of our company.Three-way valves, that securely enable the startup of each chiller, have been used. The Sequence of Operation is the key to the effective function of the installation.