... arrangement mode:double-stage compressor circuit5.Cross level control mode:four stage compressor circuit Bay numbers:2,3,4,5,6 ... of pplications such as:Window, Split and package AC systems;2.Commercial Refrigeration Systems (Kitchen refrigerator,bottle cooler,deep freezer,milk tank ... air-conditioning;6.Special Application Coils. New type aluminum small cooling and heating ac condenser coil