Gree GMV5E Series Service Manual page 269

GREE
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 and the pressure
gauge reads -1 kgf/cm2, 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 or higher, conduct leakage check again.
Step 15: Fill refrigerant.
Before filling refrigerant, check its manufacturer, package, and print information. Besides, check
refrigerant pressure and quality against the saturation pressure / temperature list.
1. Measure and check the pressure of the entire refrigerant product against the saturation pressure /
temperature list. Verify temperature parameter. If the difference between the actual temperature
and the parameter value is 3° C or more, the refrigerant quality is unsatisfactory.
2. If the refrigerant is proved satisfactory, fill refrigerant of the combined amount of the rated amount
(specified on the nameplate) and the calculated refrigerant loss amount.
For a multi-modular unit system, if only the refrigerant of an ODU is drawn out, add 80% refrigerant
of the rated fill amount (specified on the nameplate of the ODU) and start the system for a debugging
test.
Step 16: Install electric parts.
Install the electric box and connect various parts to the electric box by referring to the marks made
beforehand and the wiring diagram on the back of the box. Wire the compressors and corresponding
electric heating belts.
Note: Wires should be checked against the wiring diagram beforehand so that they can be
connected correctly.
Step 17: Start for debugging.
Start the units and set them to run in refrigerating full-start, refrigerating single-start, heating full-start,
and heating single-start modes respectively. Duration for each running mode should be 30 minutes at
least. After the debug, analyze data and adjust the unit system, to ensure indexes of the entire system.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
265