What procedure should be followed when connecting copper ACR tubing?

When connecting copper ACR (Air Conditioning and Refrigeration) tubing, brazing with an inert gas purge is the preferred procedure. This method is important because it protects the joint from oxidation and contamination during the heating process. The use of an inert gas, typically nitrogen, helps to displace air and moisture inside the tubing, preventing the formation of oxide layers that can weaken the solder joint.

Brazing without the use of flux is particularly beneficial in scenarios where it can introduce impurities or debris that might compromise the integrity of the joint. The high-temperature brazing process creates a strong, long-lasting connection that withstands the pressure conditions typically found in refrigeration systems.

In contrast, using solder with flux or mechanical connectors may not provide the same strength and durability required for the high pressures involved in many refrigeration applications. Welding without purge can lead to oxidation that compromises the quality of the weld, creating potential failure points in the system. Therefore, brazing with an inert gas purge stands out as the most effective and reliable method for connecting copper ACR tubing.