Gree GMV5 - Page 92

GREE Photovoltaic Direct-driven Inverter Multi VRF Units
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After confirming that there is no leakage from the system, when the compressor is not in operation,
charge additional R410A with specified amount to the unit through the filling opening of the liquid pipe
valve of the outdoor unit. If required additional refrigerant cannot be quickly filled for increase of pressure
in the pipe, set the unit at cooling startup and then fill the refrigerant from gas valve of outdoor unit. If
ambient temperature is low, the unit can’t be set to cooling mode but heating mode.
10.1.1 Precautions on Refrigerant Leakage
(1) Personnel related to air conditioning engineering design and installation operators must abide by
the safety requirement for preventing refrigerant leakage specified in local laws and regulations.
(2) The units adopt the R410A refrigerant, which is nonflammable and nontoxic. However, the space
for refrigerant leakage must be sufficient to ensure that the refrigerant concentration does not
exceed that specified in the safety requirement; otherwise, people involved can be stifled by the
refrigerant. For example the maximum allowed concentration level of refrigerant to a humanly
space for R410A according to the appropriate European Standard is limited to 0.44 kg/m
3
.
The maximum amount of refrigerant (kg) in the system = The volume of the room (m
3
) ×The
maximum allowed concentration level of refrigerant (kg/m
3
)
Total amount of refrigerant (kg) in the system = Total additional charging amount (kg) + Amount of
refrigerant (kg) which is charged before leaving the factory (for the system consisting of multiple modules
in parallel, the accumulative charge quantity of modules before leaving the factory is used)
Total amount of refrigerant (kg) in the system ≤The maximum amount of refrigerant (kg) in the
system
(3) When the total amount of refrigerant in the system is more than the maximum amount of
refrigerant, the cooling system should be designed again. In this case, the cooling system can
also be separated into several cooling systems with small capacity, or add corresponding
ventilation measures or alarming display.
① Flow direction of refrigerant leakage.
② Room for refrigerant leakage. Since the concentration of refrigerant is greater than that of air, pay
attention to the spaces where the refrigerant may residue, for example, the basement.