本标准的目的是建立一个框架，以确保R-744和R-1234yf移动空调（MAC）系统的所有蒸发器应满足适当的测试和标签要求。SAE J639要求进行评估，以将MAC系统中的合理风险降至最低。蒸发器（按照设计和制造）应是风险评估的一部分，车辆制造商有责任确保蒸发器的所有相关方面都包括在内。所有车辆或蒸发器制造商都有责任至少遵守本文件的标准。（车辆制造商可替代与现场返回数据相关的特定试验程序。 )在适当情况下，本标准可作为支持风险评估的指南。 关于认证，大多数车辆制造商都建立了正式的生产零件批准流程（PPAP），其中建立了合规认证并正式记录在案。对于非原装设备部件的蒸发器制造商（或没有正式部件符合性认证流程的车辆制造商），则本标准中所述的认证是这些蒸发器应符合的要求。在这种情况下，蒸发器制造商或独立机构应根据SAE J2911完成蒸发器认证。后者的一个例子是蒸发器制造商完成见证试验，见证组织提交证明文件。 制冷剂R-152a被排除在本标准之外，因为需要二次回路制冷剂系统。本标准也不适用于R-134a制冷剂蒸发器，因为它已在使用中得到验证。

The intent of this standard is to establish a framework to assure that all evaporators for R-744 and R-1234yf mobile air conditioning (MAC) systems shall meet appropriate testing and labeling requirements. SAE J639 requires an assement to be performed to minimize reasonable risks in MAC systems. The evaporator (as designed and manufactured) shall be part of that risk assessment, and it is the responsibility of the vehicle manufacturer to assure all relevant aspects of the evaporator are included. It is the responsibility of all vehicle or evaporator manufacturers to comply with the standards of this document at a minimum. (Substitution of specific test procedures by vehicle manufactures that correlate well to field return data is acceptable.) As appropriate, this standard can be used as a guide to support risk assessments. With regard to certification, most vehicle manufacturers have established formal production part approval processes (PPAP) where compliance certification is established and formally documented. For an evaporator manufacturer of non-original equipment parts (or a vehicle manufacturer that does not have a formal part compliance certification process), then the certification described in this standard is the requirement to which those evaporators shall comply. In this case, the evaporator manufacturer or an independent institution shall complete the evaporator certification according to SAE J2911. An example of the latter would be the completion of witness testing by the evaporator manufacturer with the submission of certification documents by the witness organization. Refrigerant R-152a was excluded from this standard because a secondary loop refrigerant system is required. This standard also does not apply to R-134a refrigerant evaporators because it is proven in use.