Gree GMV-72WM/B-U Owner's Manual page 31

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.
4.5.3 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
The maximum amount of refrigerant (kg) in the system = The volume of the room (m
maximum allowed concentration level of refrigerant (kg/m
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.
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.
3
.
Fig.4.5.3
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