Cooling groups are designed according to capacity of tanks. For 500 - 1.500 liters capacity tanks single compressor is used and double or more compressors for higher capacities. That is because to provide a faster cooling process. Additionaly, compressors work in a sequence depending on capacity which extends compressor life. Generally scroll type compressors are chosen. HighAow pressure sensors are placed on compressors to make them in a healthy way. Condenser’s capacity determined consider in ambient climate. Condensers have fan control system according to weather conditions.