Outdoor unit for the production of chilled water equipped with centrifugal oil-free compressors and available with R134a or R513A refrigerants. The machine comprises inverter fans, microchannel condensation coils, a flooded tube bundle evaporator with a reduced quantity of load and an electronic expansion valve, guaranteeing high performance and maximum reliability. The base, the structure and the panels are made of galvanised steel sheet painted with polyester powders, ensuring robustness and resistance to atmospheric agents. Designed to offer maximum operational flexibility, the unit adapts to a wide variety of load conditions thanks to an advanced temperature control system and a continuous variable speed compressor. The centrifugal compressor, equipped with magnetic levitation bearings and digital control of the impeller speed, makes it possible to achieve high levels of efficiency even with partial loads.