GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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Caution
Lubricant is of great importance to the normal running of compressor. You should follow the
requirements of Gree to add qualified lubricant of the specific trademark and ensure the correctness of
charging amount.
Step 15: Vacuum pumping
After lubricant is properly added, keep evacuating until the internal pressure reaches the absolute
pressure 0kgf/cm2 and the gauge pressure reaches -1kgf/cm2. This is to ensure that moisture inside the
pipeline is completely vaporized.
Vacuum pumps of the following specifications are recommended:
Type Maximum discharge rate
Purpose
100L/min Applicable Applicable
50L/min Applicable Applicable
Connect a vacuum pump to big and small valves and evacuate at the same time. During evacuating,
connect a pressure gauge. When the internal pressure reaches absolute pressure 0kgf/cm
2
and
pressure gauge reads -1kgf/cm
2
, keep evacuating for 0.5~1 hour. After that, turn off the knob of high and
low pressure gauge and close the pump. 1 hour later, if pressure remains the same, charge refrigerant. If
pressure increases by 0.1 kgf/cm
2
or more, it’s necessary to conduct leak test again.
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