The indoor vertical air conditioning units CLIMAVENETA RACK COOLER is an effective management system of the Hot Spots in the data center, ensuring low energy consumption and usage possibilities even under extremely high loads for HIGH DENSITY rack ´up and over 40 kW/m2 rack.The use of EC fan systems, featuring last-generation electronic-switching brushless motors, assures excellent performance and low consumption. The Rack Cooler Rack unit CRCF, coupled with the condensig water unit i-HCFT, combines the direct expansion system with the use of indirect free cooling water to ensure the cooling capacity required by the server with the maximum energy savings. The CRCF works in free cooling mode when the outside temperature permits using outdoor air as a source of indirect cooling, allowing the simultaneous operation between direct expansion system and water to maximize efficiency. For an easy integration in the plant, the water condensing unit i-HCFT fitted with plate heat exchanger, is equipped with dry cooler axial fans, circulation pump and expansion vessel. Fitted with INVERTER-DRIVEN HERMETIC SCROLL compressor for operation on R410A refrigerant, mounted on rubber vibration dampers, complete with oil charge, supplied with oil separator to ensure correct lubrication even at minimum speed, and fitted with thermal protector. PRINCIPLE OF OPERATION These individual units to be positioned between the racks in the row so as to act locally in order to dissipate the load of servers. In InRow versions (CRCF-I) by treating the air is sucked in the back of the unit directly from hot aisle of data center (35 ° C) to be cooled and sent on the cold aisle (18-20 ° C) in front of the racks. In Enclosure versions (CRCF-E) servers and conditioner are hermetically housed avoiding phenomena of mixing air with the outside, with obvious loss of efficiency in the conditioning. The air is sucked directly into the rack from the back closed directly by the servers (46 ° C) and sent from the front once cooled (25-30 ° C) directly to the servers with considerable savings of energy due to the smaller amount treated air.