Gree GMV-VQ680WM/C-X Service Manual page 351

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the pressure does not change, the refrigerant can be charged. If the pressure rises by over 0.1
2
kgf/cm , 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 refrigerant pressure before charging the refrigerant. The refrigerant quality can be
judged according to the refrigerant saturation pressure and temperature table.
The charging method is described as follows: Measure the pressure of the whole refrigerant
tank, check the saturation pressure and temperature against the parameter table, and check the
ambient temperature. If the difference is greater than 3°C, there is a problem with the refrigerant.
After confirming that the refrigerant is correct, calculate the refrigerant charging amount
according to the standard charging requirement; the standard refrigerant charging amount is the
sum of the nominal charging amount of the nameplate, the refrigerant amount to be recharged for
the pipeline and the additional refrigerant amount necessary for the module.
If the unit comprises multiple modules, discharge only the refrigerant of the ODU before the
maintenance. Make corresponding adjustment via the startup commissioning parameters after
recharging 80% of the nominal charging amount of the nameplate of the ODU.
Step 17: Connecting electrical parts
Connect the electrical parts according to the previous markings and the circuit diagram behind
the electrical appliance cover, connect the compressor cables, the corresponding electric heating
belt and the corresponding temperature sensors.
※Note: Check the wiring according to the circuit diagram and make sure that all the electrical
parts are wired correctly.
Step 18: Startup commissioning
Perform the startup commissioning separately when the unit is working in cooling mode with
full load, in cooling mode only, in heating mode with full load, and in heating mode only. In each
case, run the unit for more than 30 minutes, analyze the data, adjust the unit system and make
sure that all parameters are correct. For specific parameters, contact after-sales engineers or
Gree's technicians.
5.1.5 Removing and Installing Blades
Preparations
(1) Use the power circuit breaker to switch off the power of the GMV6 HR VRF system.
(2) Remove the unit top cover assembly.
A. Applicable to model GMV-VQ224/280/335WM/C-X.
①Remove the front and rear cover plate
GMV6 HR DC Inverter VRF Units Service Manual
349