Unit description Outdoor unit for the production of chilled water, equipped with semi-hermetic screw compressors type optimized for R134a, axial-flow fans, condensing coil with copper tubes and aluminum fins, shell and tube evaporator single pass and electronic expansion valve. Chiller characterized by high efficiency ensured by booster patent pending solution. Base and supporting structure and panels are are of galvanized epoxy powder coated steel. The unit in supplied with anti-freeze oil and refrigerant and has been factory tested. On-site installation therefore just involves making connections to the mains power and water supplies. These units, fitted with FREE-COOLING coils, are used in civil and industrial installations when the demand for cooling load persists even during the cold months or when the outdoor temperature is lower than the temperature of the liquid return line. In free cooling mode, the fluid is cooled by outside air, thus reducing the load of the compressors until it is completely canceled; this occurs already at ambient temperatures positive (T + versions and SL-T +), with an energy cost very close to zero (@ FREE-COOLING 100% EER 24 for T+ version and EER 36 for SL-T + version). Further more the NG configuration complies with applications where it is not allowed or desired the use of ethylene glycol. Version T+ - Version with positive free-cooling temperature 100% SL-T+ - Super low noise version with positive free-cooling temperature 100% Configurations - - basic function NG - function for free-cooling without use of glycole