本SAE标准适用于二氧化碳R-744制冷剂，该制冷剂用于维修设计为使用二氧化碳（R-744）的机动车乘客空调（A/C）系统。本文件不包括密封冷藏货物系统。

This SAE Standard applies to Carbon Dioxide R-744 refrigerant used to service motor vehicle passenger air-conditioning (A/C) systems designed to use CO2 (R-744).Hermetically sealed, refrigerated cargo systems are not covered by this document.