Purging and Pressure Testing

Using a refrigerant for purging contaminants from a system is no longer acceptable. To remove contaminants from a system and remain environmentally safe, use dry nitrogen. To assure the system is clean of contaminants before charging with refrigerants, purge the system with low pressure dry nirogen when brazing. Testing a system for leaks with nitrogen will save time and money. Prest-O-Lite®’s Nitrogen Regulator R-36-500-580 can deliver up to 500 psig to pressurize a system for leak testing at operating pressure. Always use manufacturer’s recommended specifications for maximum test pressure before testing.