Make sure that both High and Low valves are shut off in your AC gauge..
Attach HVAC gauge's blue hose onto the low-pressure port on the unit outside.
Hook the yellow hose in the center into your vacuum pump.
Turn your vacuum pump on and open HVAC gauge's low-pressure part.
Allow your pump to run until it goes in negative pressure indicating vacuum.
Run the pump for minimum of fifteen to twenty minutes or longer, and then switch off your vacuum pump.
Let your unit rest for twenty to thirty minutes and ensure the vacuum stays in place.
If there is vacuum, then there are no leakages, and it will release the refrigerant into the system.
Via Allen Key, allow your refrigerant to enter your air conditioning system.
Some refrigerant may leak, and that is all, and it's required to break the vacuum...
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