LG MULTI V Installation Manual page 66

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.
[Heat Pump]
Between Indoor and Master Outdoor unit
SODU IDU INTERNET DRY1 DRY2 GND 12V
A
B A B 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)
66 Outdoor Unit
A
4 3 4
SODU IDU
Master
Outdoor Unit
B A B
SODU IDU
B A B
INTERNET DRY1 DRY2 GND 12V
A
B A
INTERNET DRY1 DRY2 GND 12V
A
B A
Master
Outdoor Unit
Slave
Outdoor Unit