DC Inverter Multi VRF System User Manual
16
4.5 Vacuum Pumping, Refrigerant Adding
4.5.1 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.
Fig. 20
4.5.2 Refrigerant Adding
(1) Refrigerant quantity of outdoor unit before delivery:
Note:
①The refrigerant amount charged before delivery doesn’t include the amount that needs to be
added to indoor units and the connection pipeline.
②Length 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.
③Record 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
Quantity of additional refrigerant per meter for liquid pipe（kg/m）
Note: Liquid pipe that is within 20m doesn’t need to be added with refrigerant.
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
pipe valve of the outdoor unit. If required amount cannot be quickly filled due to pressure increase
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