LG ARUN80LN3 Installation Manual page 71

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 DRY1 DRY2 GND 12V
A
B A B B A
3 4 3 4
The GND terminal at the main PCB is a '-'
terminal for dry contact.
It is not the point to make ground
connection.
• Make sure that terminal number of master
and slave outdoor units are
matched.(A-A,B-B)
SODU
Master
Outdoor Unit
B A
SODU
3 4
B A
SODU
A
B
SODU
B A
Electrical Wiring
IDU INTERNET DRY1 DRY2 GND 12V
A
B B A
IDU INTERNET DRY1 DRY2 GND 12V
A
B B A
IDU INTERNET DRY1 DRY2 GND 12V
A
B B A
IDU INTERNET DRY1 DRY2 GND 12V
A
B B A
Installation Manual 71
Master
Outdoor Unit
Slave1
Outdoor Unit
Slave2
Outdoor Unit
Slave3
Outdoor Unit