Gree Ultra Heat GMV-VQ72W/A-F, Service Manual, Page: 85 / 207

Ultra Heat GMV VRF Technical Service Manual_Heat Recovery Serial INSTALLATION
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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 and the compressor is not in operation,
charge additional R410A with specified amount to the unit through the filling opening of the liquid pipe
valve of the outdoor unit. 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.

Refrigerant amount must be calculated and treated by strictly following the above methods. Otherwise,
system will not work normally and compressor may even be damaged.
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Rated capacity configuration ratio C of outdoor/indoor unit = Rated Cooling capacity sum of indoor
units/Rated Cooling capacity sum of outdoor units

If all the indoor units are GMV-NDX series fresh air indoor units, the added refrigerant quantity B for
every module is 0 kg (bound).
2 METHOD FOR PERFUSING REFRIGERANT
Refrigerant perfusion for the VRF system is classified into pre-perfusion and perfusion during
running.
2.1 Refrigerant Pre-perfusion
Step 1: Connect the high pressure gauge pipe to the detection opening of the liquid pipe, and the
medium gauge pipe to the vacuum pump. Power on the vacuum pump to perform vacuumization and