Deep freezing tunnels are used primarily in the food industry for quick freezing of food. This process maintains maximum food quality after defrosting. In a "freezing shock", the product's water freezes with a lot more initial ice crystals, so no large ice crystals that break down the cells membrane in the product appear. The procedure itself is carried out with extremely low evaporation temperatures to accelerate freezing. Such methods are most commonly found in larger plants where several tens of tons of goods in one batch need to be frozen. For such conditions, in our case, a vaporizer requires a total output of 80 kW per one refrigerator. The system is made up of 3 screw compressors, 1 for each freezer and a water-cooled condenser. In order to make the system more efficient, the temperature dynamics in the tunnel were monitored and the evaporation temperature adjusted accordingly for maximum compressor and evaporator performance. The working substance used is R449A (Opteon XP40), based on HFO and HFC groups of working substances. In this paper the evaporator and condenser calculations are also processed, and finally the disposition drawing and the coupling scheme are shown.