GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
21
8 PRECAUTIONS ON REFRIGERANT LEAKAGE
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. If such
safety requirement is unavailable in local documents, the design and operation must be implemented
based on the following principles: GMV5 series VRF 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.
The maximum refrigerant charge and maximum refrigerant concentration in the system are
calculated directly based on the size of the air conditioning space. The unit of refrigerant concentration is
1 kg/m³ or 1lb/m³.
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.
Method for calculating the maximum concentration of refrigerant:
(1) Calculate the refrigerant charge quantity of each system.
Charge quantity of an ODU upon delivery (for the system consisting of multiple modules in parallel,
the accumulative charge quantity of modules upon delivery is used) + Onsite charge quantity = Total
refrigerant charge quantity in the system (kg)
(2) Calculate the volume of maximum air conditioning space (m³).
Volume of air conditioning space (m³) = Length x Width x Height
Note: The length, width and height here refer to the effective length, width and height of the indoor
space.
(3) Calculate the maximum refrigerant concentration of the refrigeration system.
Note: If the maximum supported refrigerant concentration is not available in relevant local standard,
use 0.3kg /m³ (0.66lbs/m³)as the maximum supported refrigerant concentration.
(4) If the maximum refrigerant concentration exceeds the allowed threshold, the refrigeration system
must be redesigned. In this case, separate the refrigeration system into multiple small-capacity
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