... -closed screw-type or fully closed scroll-type compressors;d.Running advantage: Low energy consumption, stable operation, little vibration, ... imported components, system with optimal design, stable operation of unit;f.Refrigerants: Environment Protection refrigerants like R134a, R407C, R410A and ... tower makes the environment more beautiful.g.Low running charge: The running charge only 1/3 to 1/2 of ...