Gree GMV-224WM/G-X Owner's Manual page 40

GMV DC Inverter VRF
Notes:
① Rated capacity configuration rate of indoor unit and outdoor unit C = sum of indoor unit rated
cooling capacity / sum of outdoor unit rated cooling capacity.
② If all indoor units are all fresh air indoor units, the added refrigerant amount for each module
B is 0kg.
③ If all fresh air indoor units are mixed with the general VRF indoor units, charge the refrigerant
according to the refrigerant-charging method of the general indoor unit.
For example1:
Outdoor unit consists of one 28kW module and one 45kW module. Five 14kW duct type units are
used as indoor units.
IDU/ODU rated capacity collocation ratio C=14.0×5/(28.0+45.0)=96%. The quantity of included
IDUs is more than 4 sets. Please refer to the above table.
Additional refrigerant quantity B for 28kW module is 2.0 kg.
Additional refrigerant quantity B for 45kw module is 4 kg.
So, ∑Refrigerant charging amount B of every module=2.0+4=6 kg.
Suppose the Pipeline charging amount A=∑Liquid pipe length × refrigerant charging amount of
every 1m liquid pipe=20kg.
Total refrigerant charging amount R=20+6=26kg.
For example 2:
Outdoor unit is a 45kW module and the indoor unit is a 45kW fresh air unit. The quantity (B) of
refrigerant added to this module is 0kg.
So, ∑Refrigerant charging amount B of every module= 0kg.
Suppose the Pipeline charging amount A=∑Liquid pipe length × refrigerant charging amount of
every 1m liquid pipe = 5kg.
Total refrigerant charging amount R = 5+0=5kg.
Modular combination of outdoor unit subjects to combinations that is currently available.
3.7.2 Refrigerant-charging Method
Refrigerant charging for multi VRF unit includes two parts: pre-charging and start-up charging.
(1) Pre-charging of refrigerant.
Step 1: Connect the pipe of high pressure gauge of the pressure gauge to the detection port of
liquid pipe, the pipe of low pressure gauge to the detection port of gas pipe valve, and the pipe of
intermediate pressure gauge to the vacuum pump. Put through the power for the vacuum pump to
conduct the vacuum drying work.
Step 2: Once vacuum drying is completed, close the high pressure gauge valve and the low
pressure gauge valve. Disassemble the intermediate gauge pipe and the vacuum pump connection
end, and then connect the refrigerant tank.
Step 3: Properly loosen the pipe of intermediate gauge and the connection end of pressure gauge,
slightly open the refrigerant tank valve, and empty the pipe of intermediate gauge. After that, retighten
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