LG ARUN80LN3 Installation Manual page 64

Electrical Wiring
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
A
B A B
3 4 3
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)
64 Outdoor Unit
INTERNET DRY1 DRY2 GND 12V
B A
4 3 4
SODU IDU
Master
Outdoor Unit
B A B
SODU IDU
B A B
SODU IDU
A B
B
SODU IDU
A B
B
INTERNET DRY1 DRY2 GND 12V
A
B A
INTERNET DRY1 DRY2 GND 12V
A
B A
INTERNET DRY1 DRY2 GND 12V
A
B A
INTERNET DRY1 DRY2 GND 12V
A
B A
Master
Outdoor Unit
Slave1
Outdoor Unit
Slave2
Outdoor Unit
Slave3
Outdoor Unit