Follow each step carefully.
Collect refrigerant gauge, refrigerant canister, and safety gear.
Verify the refrigerant type required for your system.
Attach the refrigerant gauge to the service port.
Open the refrigerant canister valve slowly.
Watch the gauge for appropriate pressure levels.
Once filled, close the canister valve securely.
Remove the refrigerant gauge from the service port.
Inspect connections for any refrigerant leaks.