Gree Ultra Heat GMV Multi VRF Series Owner's Manual page 31

The OUD is GMV-VQ192WM/A-F(U) including GMV-VQ96W/A-F(U) and GMV-VQ96W/A-F(U). The
IDUs are made up of 10 sets of GMV-ND18PHS/A-T(U).
IDU/ODU rated capacity collocation ratio C=18×10/192=94%.The quantity of included IDUs is more
than 8 sets. Please refer to the above table.
Refrigerant charging amount B for GMV-VQ96W/A-F(U) module is3kg(6.6 lbs).
Refrigerant charging amount B for GMV-VQ96W/A-F(U) module is3kg(6.6 lbs).
Suppose the Pipeline charging amount A=Added refrigerant quantity A1 for liquid piping + Added
refrigerant quantity A2 for high pressure gas piping=25kg (55.1 lbs)
Total refrigerant charging amount R=25+3+3=31kg (55.1+6.6+6.6=68.3 lbs).
For example 2:
The OUD is GMV-VQ72W/A-F(U). The IDUs are made up of 1 set of GMV-NDX72P/A-T(U).
IDU/ODU rated capacity collocation ratio C=0/72=0%. Refrigerant charging amount B for GMV-VQ
72W/A-F(U) module is0kg(0 lbs).
Suppose the Pipeline charging amount A=Added refrigerant quantity A1 for liquid piping + Added
refrigerant quantity A2 for high pressure gas piping=25kg (55.1 lbs)
Total refrigerant charging amount R=25+0=25kg (55.1+0=55.1 lbs).
After confirming that there is no leakage from the system, charge additional R410A with specified
amount to the unit through the filling opening of the liquid pipe valve of the outdoor unit when the
compressor is not in operation. 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
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. For example, the maximum allowed concentration level of refrigerant to a
humanly space for R410A according to the appropriate European Standard is limited to 0.44kg/m
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,
Ultra Heat GMV Multi VRF_Heat Recovery Serial
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