What is the purpose of using dry nitrogen in refrigerant circuits during brazing?

Using dry nitrogen in refrigerant circuits during brazing serves the crucial function of preventing the formation of oxides. When metal is heated during the brazing process, there is a risk of oxidation, which can degrade the quality of the joint and compromise the integrity of the refrigerant circuit. Oxides can form on the surface of the metal, leading to poor adhesion between the brazed components and creating additional places for refrigerant leaks.

By passing dry nitrogen through the system, which is an inert gas, you effectively create a protective atmosphere that displaces air and moisture. This prevents oxidation and ensures cleaner, stronger joints when the brazing is completed. The use of dry nitrogen is a standard practice in HVAC installation and maintenance, particularly in systems that will contain refrigerants, to ensure long-lasting and efficient operation of the heat pump.