DC Inverter Multi
VRF Service Manual
121
5.12.2 Steps of refrigerant charge are as follows:
a. The connecting hose of refrigerant cylinder shall be connected to the connector of the pressure gauge. The valve
VH shall be opened to discharge air in the hose. Then, the high pressure end of the pressure gauge shall be connected to the
refrigerant lling nozzle on the small valve of outdoor unit.
Refrigerant cylinder
Spring balance
Connector on gas side
Connector on liquid side
Pressure gauge connector valve
Gas liquid
VH VL
b. Open pressure gauge valve VH, then ll liquid state refrigerant into the liquid pipe side until required amount is
reached.
If refrigerant can not be charged in system unless the unit is turned on, let the system run at full-load cooling mode.
Open VH and discharge air in the hose. The high pressure end of pressure gauge is connected to the refrigerant lling
nozzle on the small valve of outdoor unit. Open VL and charge gas state refrigerant into the gas pipe until required
charging amount is reached.
c. Observe electronic balance or spring balance. When required amount is reached, the valve shall be closed very
quickly and then source valve on the refrigerant valve shall be shut off
d. The amount of charging refrigerant shall be recorded.
Refrigerant charge shall be recorded as per the following table.
Unit Mark Amount of charging refrigerant(kg)
Unit 1
Unit2
………
Unitn
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