LG ARUM080LTE5 Engineering Product Data Book page 93

Multi V 5
5. Field 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.B SODU.A IDU.B IDU.A
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)
Example Connection of Communication Cable
• Connection of communication cable must be installed
like below figure between indoor unit to outdoor unit.
BUS Type
86
CEN.B CEN.A DRY1 DRY2 GND 12V
4 3 4
Master
SODU.B SODU.A IDU.B IDU.A
Outdoor Unit
SODU.B SODU.A IDU.B IDU.A
SODU.B SODU.A IDU.B IDU.A
• Abnormal operation can be caused by communication
defect, when connection of communication cable
isinstalled like below figure.
STAR Type
Outdoor Units
CEN.B CEN.A DRY1 DRY2 GND 12V
CEN.B CEN.A DRY1 DRY2 GND 12V
CEN.B CEN.A DRY1 DRY2 GND 12V
Master
Outdoor unit
Slave1
Outdoor Unit
Slave2
Outdoor Unit