Which refrigerant is copper tubing never used with?

Copper tubing is not used with R-717, also known as ammonia, because ammonia is corrosive to copper over time. While copper is widely utilized in many refrigeration systems, its interaction with ammonia poses significant risks, as the corrosion can lead to leaks and system failure.

In contrast, refrigerants like HCFC 22 and HCFC 134a are compatible with copper tubing. HCFC 22, a common hydrochlorofluorocarbon refrigerant, does not have the corrosive properties that ammonia possesses, making it safe for use with copper. Similarly, HCFC 134a is also considered safe to use with copper without the same detrimental effects.

The general statement that copper tubing is never used with any refrigerant is too broad and inaccurate. It misrepresents the compatibility of copper with many commonly used refrigerants. Therefore, the specific reference to R-717 highlights the importance of understanding material compatibility in the design and maintenance of refrigeration systems to ensure safety and effective operation.