HVAC Triple Evacuation
There is definitely some confusion among HVAC/R technicians about the proper methods of evacuation before introducing the refrigerant to the refrigeration circuit.
Let me be clear from the start that my methods of evacuating a refrigeration circuit
are based on experience, education and an official guide produced by the US Military and their specifications and proper procedures for evacuating a refrigeration system. It is the proper procedure on any US Navy ship or support ship that a refrigeration system that has been open to the environment be triple evacuated before the refrigerant is reintroduced to the refrigeration circuit. The purpose is to prevent future problems because of contaminants including moisture in the system. (more…)