Which type of copper tubing is restricted in size for certain refrigerant applications?

Annealed temper copper tube is restricted in size for certain refrigerant applications due to its physical properties and the specific requirements of refrigerant systems. Annealed copper tubing is more flexible than hard-drawn types, which allows it to be easily bent and shaped for various installations. However, this flexibility can also limit the operational pressure it can handle effectively.

Specific applications, particularly those involving refrigerants, often have size and pressure limitations to ensure the integrity and safety of the system. The annealed temper may be more susceptible to damage from physical stress or pressure changes, making it necessary to adhere to restrictions regarding its diameter and wall thickness in these scenarios. Designing a refrigerant system with components that are incompatible or inadequately rated for pressure can lead to failures or leaks, so these restrictions are in place to maintain system reliability and safety.

In contrast, soft drawn and hard drawn copper tubing both have specific uses but do not have the same restrictions concerning refrigerants; they are often used in applications requiring strength and durability. Welded copper tubing, while useful, is generally not subject to the same restrictions related to refrigerant applications as they are not typically used in the same capacity.