Vacuum Pumping, Refrigerant Adding - Gree GMV-12WP/A-T Owner's Manual

4.5.8 Support and Protection of Pipeline
(1) Support should be made for hanging connection pipe. Distance between each support
cannot be over 1m (3-1/4feet).
(2) Protection against accidental damage should be made for outdoor pipeline. When pipeline
exceeds 1m (3-1/4feet), a pinch board should be added for protection.

4.6 Vacuum Pumping, Refrigerant Adding

4.6.1 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.
4.6.2 Refrigerant Adding
(1) Refrigerant quantity of outdoor unit before delivery:
Refrigerant Qty (kg/oz)
(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 = Quantity of additional refrigerant for each set of indoor unit:
0.2kg (7oz) +∑length of liquid pipe × quantity of additional refrigerant per meter
Model
Fig. 28
GMV-12WP/A-T(U)
16
DC Inverter Multi VRF System
0.8(28.2)