This standard specifies the terms and definitions, product classification, basic parameters, technical requirements, test methods, inspection rules, signs, packaging and storage of screw refrigerant compressors and screw refrigerant compressor units. This standard applies to screw refrigerant compressors (hereinafter referred to as compressors) and screw refrigerant compressor units (hereinafter referred to as "units") using R717, R22, Rl34a, R404A, R407C and R410A as refrigerants. Compressors and compressor units using other refrigerants can be implemented as a reference.