... )two types:Totally-hermetic, semi-hermetic compressor for cold room 1compressor for cold room include total-hermetic piston compressor and ... Semi-hermetic compressor,open-type piston compressor 2. compressor for cold room is mainly composed of a machine body, ... low noise and good sealing .6. Refrigerant : R134a ,R404A , R22 ,R5027.Applicable objects: flowers, tea, medicine, medicine, medical equipment, ...