Which type of copper tube is designated for air-conditioning and refrigeration installations?

The designation "ACR" specifically refers to copper tubes that are intended for use in air-conditioning and refrigeration applications. This type of copper tube is manufactured to rigorous standards that ensure it is specifically suited for the needs of these systems, including the ability to withstand the refrigerants typically used in air-conditioning and refrigeration.

ACR tubing is often treated to enhance its durability and resistance to corrosion, which is essential for maintaining the performance and reliability of refrigeration systems. This type of tubing is distinguished from other types of copper pipe, such as Type K, Type L, and standard plumbing copper, which may not be appropriate for the unique pressures and temperatures encountered in refrigeration systems. Therefore, the correct designation for copper tubes utilized in air-conditioning and refrigeration settings is ACR.