本SAE标准适用于制冷剂蒸汽压缩系统，该系统为使用汽车式移动空调（MAC）系统的乘用车、轻型卡车和商用车（道路上和越野）提供冷却和/或加热。本标准不包括不使用典型汽车空调系统或使用本文件未列出制冷剂的大型卡车、公共汽车和其他车辆。本标准适用于配备MAC系统的车辆，该系统使用皮带驱动压缩机和电机驱动压缩机。本文件为MAC系统（包括必要的服务设备）的设计、组装和测试提供了行业公认的标准，旨在涵盖MAC系统寿命的所有阶段，以将环境、健康和安全影响降至最低。本文件中列出的标准涵盖了当前公认的行业指南和程序。这些标准可作为监管机构满足最低环境、健康和安全要求的要求。 还包括服务行业的警告声明，以提醒技术人员在服务期间排放制冷剂的不可取性以及可能对健康或安全造成的影响。其目的不是限制用于MAC应用的其他类型制冷剂或制冷系统的使用或进一步开发。如果其他制冷剂或制冷系统变得实用，则可以修改本文件或制定其他安全标准。本文件仅涉及HFC-134a（R-134a）、二氧化碳（R-744）、HFO-1234yf（R-1234yf）和HFC-152a（R-152a）制冷剂。对于R-152a制冷剂，本标准仅适用于二次回路系统。为防止系统污染，MAC蒸汽压缩系统中使用的所有制冷剂都需要独特的维修配件和维修设备。独特的维修配件旨在显著降低制冷剂交叉的可能性- 维修活动中的污染。CFC-12（R-12）不再用于新的MAC系统。维修配件说明作为仍在使用的旧款车辆的参考。当改装R-12系统以使用R-134a或拆除R-12（在车辆处置过程中）时，请使用为R-12设计并经认证符合SAE J1990（R-12回收和再循环设备）要求的维修设备。

This SAE Standard applies to refrigerant vapor compression systems that provide cooling and/or heating for passenger cars, light trucks, and commercial vehicles (on and off road) that use automotive type mobile air conditioning (MAC) systems. Large trucks, buses, and other vehicles that do not use typical automotive A/C systems or use refrigerants not listed in this document are not covered by this standard. This standard covers vehicles with MAC systems using belt driven compressors and electric motor driven compressors.This document provides industry-recognized standards for the design, assembly, and test of MAC systems, including necessary service equipment, and is intended to cover all phases of the lifetime of MAC systems to minimize environmental, health, and safety impacts. The standards listed in this document cover the currently accepted industry guidelines and procedures. The standards can be used as requirements for regulatory authorities to meet minimum environmental, health, and safety requirements. Also included are cautionary statements for the service industry to alert technicians to the inadvisability and possible health or safety effects associated with venting refrigerant during service. It is not intended to restrict the use, or further development of, other types of refrigerants or refrigeration systems for MAC applications. This document may be amended, or additional safety standards created, should other refrigerants or refrigeration systems become practical. This document addresses only HFC-134a (R-134a), carbon dioxide (R-744), HFO-1234yf (R-1234yf), and HFC-152a (R-152a) refrigerants. For R-152a refrigerants, this standard will only apply to secondary loop systems. To prevent system contamination, all refrigerants used in MAC vapor compression systems require unique service fittings and service equipment. The unique service fittings are intended to significantly reduce the potential for refrigerant cross-contamination during service activities.CFC-12 (R-12) is no longer in use in new MAC systems. The service fitting description is maintained as a reference for older vehicles still in use. When retrofitting an R-12 system to use R-134a or when removing R-12 (during vehicle disposal), use service equipment designed for R-12 and certified to meet the requirements of SAE J1990 (R-12 recovery and recycle equipment).