Precautions On Refrigerant Leakage - Gree Ultra Heat GMV Multi VRF Heat Recovery Series Service Manual

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial
 During installation, please strictly follow the above capacity range and number to construct, otherwise,
units may work abnormally and compressors may even be damaged

7 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:
1) Ultra Heat GMV 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 .
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.
2) 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
refrigeration systems, or add corresponding ventilation measures or alarming display.
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UNIT INTRODUCTION