A Scroll chiller of HVAC diamante company has a Scroll compressor. Scroll compressors are now produced in conventional, digital types of scrolls and inverter. The capacity of these compressors is less than that of the screw compressors, and as a result, in a chiller device, one to eight of these compressors may be used to provide the desired cooling. The number of compressors in a chiller, in addition to increasing the reliability of the device, controls the capacity of the stairs (each conventional compressor is one step) as well as the longer life of the device.