Panasonic CS-A18CKPG Service Manual page 92

Open the valve on the gas cylinder.
Open the valve on the manifold gauge, discharge for three seconds and wait for one
minute. Repeat this three times.
5. Check for gas leakage.
Check the flare connections for gas leakage.
6. Discharge the refrigerant.
Close the valve on the gas cylinder and discharge the refrigerant until the gauge
indicates 0.1 to 0.3 MPa.
7. Disconnect the manifold gauge and gas cylinder.
8. Mount the valve caps and the service port caps onto the 3-way valves.
Be sure to use a torque wrench to tighten the service port nut.
Be sure to check for gas leakage.
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