Vacuum Pumping, Refrigerant Adding - Gree FGR20Pd/DNa-X Owner's Manual

The pipes should not be shriveled when the pipes are connecting. The bend
diameter should be longer than 200 millimeter. The connecting pipes should not be
extended or curved frequently and the curving process should not be larger than 3
times in the same bending position.
During engineering installation, the connection pipe inside the unit must be
wrapped by insulation sleeve.

3.4 Vacuum Pumping, Refrigerant Adding

3.4.1 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.
3.4.2 Refrigerant Adding
(1) 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.
(2) Record the amount of additional refrigerant for convenience of after-sales
service.
Ducted Type Split Air-Conditioner Units(Inverter Series)
Fig.18
15