Refrigerant Charging; Precautions On Refrigerant Leakage - Gree GMV-S120WL/A-S Service Manual

Note:
a) Wired controller and remote-control receiver board can be used at the same time.
b) If remote-control receiver board is selected, please select a remote controller.

13.Refrigerant Charging

13.1 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: the system adopts 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 .
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:
①Calculate 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)
②Calculate the volume of minimum 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.
―Total refrigerant quantity of the system‖/―the volume of minimum air conditioning
space‖≤Maximum allowable concentration (kg/m³)
Note: If the maximum allowable refrigerant concentration is not available in relevant local
standard, use 0.3kg /m³ as the maximum allowable refrigerant concentration.
④If 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 refrigeration systems, or adopt other ventilation measures, or contact local Gree
sales company.
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