GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
226
NOTE:
Lubricant is of great importance to the normal running of compressors. You should follow
Gree‘s requirement to add qualified lubricant of the specified trademark and ensure properness of fill
amount.
Step 14: Vacuum-pump.
After lubricant is added, keep on extracting air through a vacuum pump till the internal pressure
reaches the absolute pressure 0 kgf/cm2 (0psi)and the pressure gauge reads -1 kgf/cm2 (-145psi). This
is to ensure that moistures inside the pipeline system are completely vaporized.
Vacuum pumps of the specifications below are recommended:
Open all valves in order that the vacuum pump extracts air through all the valves, during which,
connect the units to a pressure gauge. When the internal pressure reaches 0 kgf/cm2 (0psi)and the
pressure gauge reads -1 kgf/cm2 (-145psi), keep on the extraction action for 0.5~1.0 hour more. Finally,
turn off the rotary switch of the gauge and close the pump. One hour later, if the pressure remains the
same, fill refrigerant. If the pressure increases to 0.1 kgf/cm2 (14.5psi)or higher, conduct leakage
check again.
Connect the rubber hose
to the oil checking valve at
one end and put the other
end of the hose into the
glass for drawing lubricant
Extract air through all
valves. In the course of oil
fill, keep on the extraction
action
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