What type of fittings should be used to avoid the creation of oxides in the refrigeration lines of mini-split systems?

In refrigeration systems, especially mini-split systems, the choice of fittings is crucial for maintaining system integrity and performance. Heavy-walled flare fittings are preferred because they offer a robust and secure connection that is less likely to allow contaminants into the refrigeration lines.

These fittings help prevent the formation of oxides by ensuring a tight seal that minimizes the chance of moisture or air ingress. Oxides can form when moisture is present in the refrigeration cycle, potentially leading to system inefficiencies and damage. The heavy-walled construction provides additional strength to withstand pressure without risking deformation, which could otherwise compromise the joint and allow contaminants.

In contrast, lighter fittings or standard threaded fittings may not provide the same level of safety or reliability. Compression fittings, while useful in certain applications, may also not offer the same airtight seal required for refrigeration lines, allowing potential issues to arise. Thus, heavy-walled flare fittings are the preferred choice for ensuring the long-term functionality and efficiency of refrigeration systems by mitigating the risk of oxide formation.