ISO 5149-2:2014适用于制冷系统的设计、施工和安装，包括ISO 5149-1、ISO 5149-3或ISO 5149-4中未涵盖的与此类系统直接相关的管道、组件、材料和辅助设备。它还规定了测试、调试、标记和文件的要求。除与制冷系统相关的任何安全装置外，不包括二次传热回路的要求。 ISO 5149-2:2014适用于新的制冷系统、现有系统的扩展或修改，以及转移到另一现场并在另一现场运行的旧系统。 ISO 5149-2:2014适用于:a）所有尺寸的固定或移动式制冷系统，包括热泵；b） 二次冷却或加热系统；c） 制冷系统的位置；和d）采用ISO 5149本部分后，如果功能和容量不相同，则更换部件和添加部件。 ISO 5149-2:2014不包括“机动车空调”。就损坏或污染而言，它不适用于储存中的货物，但也适用于将系统转换为另一种制冷剂的情况。

ISO 5149-2:2014 is applicable to the design, construction, and installation of refrigerating systems, including piping, components, materials, and ancillary equipment directly associated with such systems, which are not covered in ISO 5149？1, ISO 5149？3, or ISO 5149？4. It also specifies requirements for testing, commissioning, marking, and documentation. Requirements for secondary heat-transfer circuits are excluded except for any safety devices associated with the refrigerating system. ISO 5149-2:2014 is applicable to new refrigerating systems, extensions or modifications of already existing systems, and for used systems, being transferred to and operated on another site. ISO 5149-2:2014 applies to: a) refrigerating systems, stationary or mobile, of all sizes including heat pumps; b) secondary cooling or heating systems; c) the location of the refrigerating systems; and d)replaced parts and added components after the adoption of this part of ISO 5149, if they are not identical in function and in capacity. ISO 5149-2:2014 does not cover "motor vehicle air conditioners". It does not apply to goods in storage, with respect to spoilage or contamination, but it also applies in the case of the conversion of a system for another refrigerant.