本SAE推荐实践适用于拟用作移动式空调（A/C）系统中替代CFC-12（R-12）的改造制冷剂的制冷剂混合物（多组分制冷剂）。由于非共沸制冷剂混合物的组成随着制冷剂通过气相或液相的损失而变化，因此给A/C系统充电的方法是重要的。本文件的目的是通过将系统性能变化与加注方法联系起来，确定用于系统加注的适当制冷剂相（液体或蒸汽）。只有结合SAE J1657的要求，本文件才是完整的。

This SAE Recommended Practice applies to refrigerant blends (multicomponent refrigerants) intended for use as retrofit refrigerants to replace CFC-12 (R-12) in mobile air-conditioning (A/C) systems. Since the composition of non-azeotropic refrigerant mixtures changes as refrigerant is lost, either through the vapor phase or the liquid phase, the method of charging A/C systems is important. The purpose of this document is to determine the proper refrigerant phase, liquid or vapor, for system charging by relating system performance changes to the charging method. This document is complete only when combined with the requirements of SAE J1657.