Gree GMV6 DC Inverter VRF Units Service Manual
258
Low pressure
measurement valve
Vacuum the gas and liquid
valves and keep them vacuum
in the oil charging process
Liquid
pipe
Gas
pipe
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
2
and the gauge pressure is
-1 kgf/cm
2
. Only in this way, can the water in the pipeline system be fully evaporated.
Recommended specifications of vacuum pump are as follows:
Model Maximum vacuum discharge
Oil-lubricating rotor
100 L/min Yes Yes
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
2
and the gauge pressure is -1 kgf/cm
2
, continue to vacuum the unit for 0.5-1h. Then,
close the high and low pressure gauge knob and stop the vacuum pump for 1h, If the pressure does not
change, the refrigerant can be charged. If the pressure rises by over 0.1 kgf/cm
2
, recheck the system for
leakage.
Step 16: Charging refrigerant
Charge the unit with the correct refrigerant. Only use high-quality refrigerant made by qualified
manufacturers. The refrigerant package must be intact and the printing must be clear. Measure the
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