LG ARUN038GS2 Installation Manual page 51

Example Connection of Communication Cable
2 Outdoor Units
When the power source is supplied to
Each outdoor unit individually.
3 Phase 3 Wires
Power supply
60Hz 460V
Power supply switch
(Switch fuse)
Power supply
1 Phase 60Hz
208/230V
HR unit
When the power source is supplied to
Each outdoor unit individually.
3 Phase 3 Wires
Power supply
60Hz 460V
(Main Switch)
Power supply
1 Phase 60Hz
208/230V
HR unit
Power supply switch
(Switch fuse)
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 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.
Between Indoor and Master Outdoor unit
SODU IDU INTERNET
B A B
HR unit
The GND terminal is a '–' terminal for the central controller, not ground line
Power supply switch
(Switch fuse : ELCB)
Power supply switch
(Switch fuse : ELCB)
DRY1 DRY2 GND 12V Master
Outdoor unit
A
3(A) 4(B) 3(A) 4(B)
Master
3 Phase 3 Wires Power line(R, S, T)
Slave
Communication line (3 line): Wired remote control
Single Phase of power supply line(L(1), L(2))
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)
HR unit
Pull box(installer option)
HR unit
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
SODU IDU INTERNET DRY1 DRY2 GND
B A B A
Electrical Wiring
12V
Master
Outdoor unit
12V
Slave
Outdoor unit
Installation Manual 51