Gree GMV5 Series Service Manual page 189

Step 3: Check oil quality.
Oil checking
valve
Before releasing the refrigerant, get some freezing oil through the oil checking valve. Connect a rubber
hose to the oil checking valve at one end and a glass container at the other end. Open the oil checking
valve. Control oil flow speed. Since the oil is a mixture of volatile refrigerant and lubricant, DO NOT cover
the container; or it may explode.
After the lubricant is fully gasified, record the volume of oil.
Step 4: Release refrigerant.
Refrigerant should be released from the high pressure side and low pressure side at the same time. If it
is released from one side only, the scroll is sealed, causing the refrigerant to fail to be released
completely. Control the release speed (it is expected to release for 12 hours or more). If too fast, massive
lubricant will be discharged with the refrigerant. Make sure to mark the valves.
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
186