DC Inverter Multi VRF System
19
binding nuts again and replace soundproofing cotton. If unit runs with metal pieces fitting on,
compressor will vibrate and un
it’s
operating life will be shortened.
4.5 Vacuum Pumping, Adding Refrigerant
Do not purge the air with refrigerants but use a vacuum pump to vacuum the installation! There is no extra
refrigerant in the outdoor unit for air purging!
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. 22
4.5.2 Adding Refrigerant
(1) Refrigerant quantity of outdoor unit before delivery:
Model
V5BV-36WMAK
V5BV-48WMAK
V5BV-60WMAK
Refrigerant Qty (kg/lb)
5.0
(11)
5.0
(11)
6.5
(14)
(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 determined on site. Therefore the amount of additional refrigerant
shall be determined according to the dimension and length of field-installed liquid pipe.
(3) Record the amount of additional refrigerant for future service reference.
(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(39-3/8inch)
