Vacuum Pumping, Refrigerant Adding - Gree GMV-H224WL/A-X Manuel D'utilisateur

DC Inverter Multi VRF System

4.4 Vacuum Pumping, Refrigerant Adding

4.4.1 Vacuum Pumping
（1） Outdoor unit has been charged with refrigerant before delivery. Field-installed
connection pipe needs to be charged with additional refrigerant.
（2） Confirm whether outdoor liquid and gas valves are closed.
（3） Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the
outdoor valve, as shown below.
4.4.2 Refrigerant Adding
（1） Refrigerant quantity of outdoor unit before delivery:
Model
Refrigerant Qty (kg)
Model
Refrigerant Qty (kg)
Note:
① The refrigerant amount charged before delivery doesn't include the amount that needs to be added to
indoor units and the connection pipeline.
② Length of connection pipe is decided on site. Therefore the amount of additional refrigerant shall be
decided on site according to the dimension and length of field-installed liquid pipe.
③ Record the amount of additional refrigerant for convenience of after-sales service.
（2） Calculation of the amount of additional refrigerant
Calculation method of the quantity of additional refrigerant (based on liquid pipe)
Quantity of additional refrigerant = ∑length of liquid pipe X quantity of additional refrigerant
per meter
Φ22.2
0.35
First confirm that there is no leakage from the system. When compressor is not working,
charge additional R410a with specific amount to the unit through the filling opening of the liquid
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GMV-H224WL/A-X
5.5
GMV-224WL/C-X
5.5
Quantity of additional refrigerant per meter for liquid pipe（kg/m）
Φ19.05 Φ15.9
0.25 0.17
Fig. 26
GMV-H280WL/A-X
7.1
GMV-280WL/C-X
7.1
Φ12.7
0.11
19
GMV-H335WL/A-X
8.0
GMV-335WL/C-X
8.0
Φ9.52 Φ6.35
0.054 0.022