LG Multi V Plus II System Installation Manual page 61

N Example Connection of Communication Cable
3 Outdoor Units
I When the power source is connected
In series between the units.
Power supply switch
(Switch fuse : ELCB)
3 Phase 4 Wires
Power supply
50Hz 380~415V
(Main Switch)
Power supply switch
(Switch)
Power supply
1 Phase 50Hz
220~240V
I When the power source is supplied to
Each outdoor unit individually.
Power supply switch
(Switch fuse : ELCB)
3 Phase 4 Wires
Power supply
50Hz 380~415V
(Main Switch)
Power supply switch
(Switch)
Power supply
1 Phase 50Hz
220~240V
WARNING
• Indoor Unit ground Lines are required for preventing electrical shock accident during current leakage,
Communication disorder by noise effect and motor current leakage (without connection to pipe).
• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from the power supply.
• Install the main switch that can interrupt all the power sources in an integrated manner because this system consists of
the equipment utilizing the multiple power sources.
• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power goes on and off while the
product is operating, attach a reversed phase protection circuit locally.
Running the product in reversed phase may break the compressor and other parts.
Between Indoor and Master Outdoor unit
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
The GND terminal is a '–' terminal for the
central controller, not Ground Line
• Make sure that terminal number of master and slave outdoor units are matched.(A-A,B-B)
Master
Slave1
SODU
12V
Master
B A
Outdoor unit
SODU
B A
SODU
B A
3 Phase 4 Wires Power line (R, S, T, N)
Communication line (3 line): Wired remote control
Slave2
Single Phase of power supply line (L, N)
Communication line (2 shield line):
Between Outdoor Unit and Outdoor Unit
Communication line (2 shield line):
Between Indoor Unit and Outdoor Unit
Pull Box(Installer Option)
Pull Box(Installer Option)
IDU INTERNET DRY1 DRY2 GND 12V
Master
Outdoor unit
B A
Slave1
IDU INTERNET DRY1 DRY2 GND 12V
Outdoor unit
B A
Slave2
IDU INTERNET DRY1 DRY2 GND 12V
Outdoor unit
B A
Electrical Wiring
Installation Manual 61