Turn on the refrigerant recovery system / vacuum pump.
Open both Coupler (3, 4), open LP Manifold Valve (1), HP Manifold Valve (2).
Read the amount of vacuum on the Blue LP Gauge.
Shut off the refrigerant recovery system / vacuum pump when the vacuum level reaches the manufacturer’s recommended level.
Close both Coupler (3, 4), close LP Manifold Valve (1), HP Manifold Valve (2).
Turn on the vehicle and allow it to come up to normal operating temperature. Then, turn on the A/C system(about 5-10 minutes).
Connect the refrigerant CAN / CYLINDER and open it with Can Tap.
Open Blue Coupler (3), open Blue LP Manifold Valve (1).
Read the amount of vacuum on the Blue LP gauge, and according to the value to select the appropriate capacity of refrigerant.
Observe the refrigerant filling condition through the Sight Glass (5) and the Blue LP gauge.
Close Blue Coupler (3) when the refrigerant volume is in line with the manufacturers recommendations.
Close Can Tap, close Blue LP Manifold Valve (1), turn off the vehicle and the A/C system.
Carefully disconnect the Couplers (3, 4) from the A/C system, the hoses may contain residual refrigerant.