Gree GMV-VQ680WM/C-X Service Manual page 350

Gree
CAUTION!
Compressor refrigeration oil plays an important role in the normal operation of compressor.
The lubricant with the correct model number and quality must be used in accordance with the
requirements of Gree after-sales and technical departments. The recharging amount must be
correct.
Step 15: System vacuuming
After adding the appropriate lubricant, it is necessary to continue vacuuming the unit. Make
sure that the pressure after vacuuming reaches the absolute pressure of 0 kgf/cm
pressure is -1 kgf/cm
Recommended specifications of vacuum pump are as follows:
Model
Oil-lubricating rotor
pump
Non-oil rotor pump
Use a vacuum pump to vacuum the unit from the gas and liquid valves simultaneously. The
pressure gauge must be connected when vacuuming. When the unit pressure reaches the
absolute pressure 0 kgf/cm
0.5-1h. Then, close the high and low pressure gauge knob and stop the vacuum pump for 1h, If
2
. Only in this way, can the water in the pipeline system be fully evaporated.
Maximum vacuum discharge
100 L/min
50 L/min
2
and the gauge pressure is -1 kgf/cm
GMV6 HR DC Inverter VRF Units Service Manual
Air discharge
Yes
Yes
2
, continue to vacuum the unit for
348
2
and the gauge
Purpose
Vacuum drying
Yes
Yes