Use vacuum pump to evacuate the air. Never use the refrigerant for the evacuation.
Drain off the nitrogen gas after the leak test and then connect the vacuum pump as shown in the figure below. 
The vacuum pumping must be done from both the liquid and gas inlets.
Use a vacuum pump with high degree of 
The pumping time depends on the length of the connecting pipe. Generally, it takes about 
If the vacuum can no 
If the vacuum can no 
After the above steps, replace the vacuum pump with the refrigerant pump and refill refrigerant.
AU84NATEAA, AD842AHEAA specifications
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