GMV DC Inverter VRF
39
Step 6: Once debugging is finished, disassemble the pressure gauge, etc., to complete the
refrigerant-charging work.
3.7.3 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) Multi VRF unit adopts R410A refrigerant. When the unit is installed in the place where there
are people, the refrigerant must not exceed the maximum allowable concentration. 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.
Fig.3.7.4
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.
3.8 Electrical Installation
3.8.1 Notices for Electrical Installation
(1) All electrical installations must be performed by professionally qualified electricians in
accordance with local laws, regulations and corresponding instructions. All parts, materials
and electrical operations provided must comply with local regulations.
(2) The unit must be reliably grounded, with grounding resistance smaller than 4Ω.
(3) The special power supply for air conditioning unit must be used, and the power supply
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