PHOENIX FREE COOLING is a series of air cooled chillers with integrated free cooling with screw compressors, designed by MTA for outdoor installation with R407C refrigerant gas. The free cooling technology is particularly suitable when the requirement for cooled water and the conditioning of environments is necessary throughout the year. It involves exploiting, in winter and in the intermediate seasons, the low temperature of the outside air to cool either completely or in part the process fluid normally cooled by the chiller through the use of refrigeration compressors, obtaining high energy savings when compared to traditional solutions. With complete independence, the microprocessor control of the PHOENIX FREE COOLING units manages, according to requirement, the gradual switching-off of the compressors and the fans, minimising energy consumption. In order to maximise the useful effect of the free cooling, these units are equipped with condensing sections independent of those of free cooling through the use of fans and special finned coils, unlike the solutions traditionally available on the market in which the free cooling batteries are superimposed on the condensing ones and supplied with a single system of fans.