LG ARUB80LT2 Installation Manual page 50

Electrical Wiring
N Example Connection of Communication Cable
3 Outdoor Units
I When the power source is connected
In series between the units.
3 phase 4 wires
power supply
(Main Switch)
Single phase
power supply
Power supply switch
(switch fuse)
I When the power source is supplied to
Each outdoor unit individually.
3 phase 4 wires
power supply
(Main Switch)
Single phase
power supply
Power supply switch
(switch fuse)
WARNING
• Indoor unit ground lines are required for preventing electrical shock accident in 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 equip-
ment 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.
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
HR unit
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)
50 Outdoor Unit
Master
Power supply switch
(Switch fuse : ELCB)
HR unit
Power supply switch
(Switch fuse : ELCB)
HR unit
12V Master
Outdoor unit
Slave1
Slave2
HR unit
HR unit
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
3 phase 4 wires power line(R, S, T)
Communication line (3 line): wired remote control
Single phase of power supply line
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)
12V Master
Outdoor unit
12V
Slave1
Outdoor unit
12V
Slave2
Outdoor unit