What is the maximum size of annealed temper copper tube allowed in refrigerant lines?

The maximum size of annealed temper copper tube allowed in refrigerant lines is 2 inches. This specification is established to ensure the safe and efficient operation of refrigeration systems. Copper tubes with this specific temper are widely used due to their excellent thermal conductivity and corrosion resistance properties.

Using copper tubes larger than 2 inches could create challenges in terms of handling, installation, and the potential for reduced system efficiency. Larger tubes could also lead to complications around pressure drop considerations, refrigerant flow, and may not be practical for the compact construction often desired in HVAC applications. The 2-inch limit addresses these factors while still allowing ample capacity for refrigerant transport within typical system designs.

Therefore, the standards set for refrigerant lines emphasize both operational performance and safety, making the 2-inch maximum size a balanced and reasonable choice for annealed temper copper tubes in refrigeration systems.