LG ARUM080LTE5 Engineering Product Data Book page 91

Multi V 5
5. Field Wiring
5.2 Heat Pump System
Example Connection of Communication Cable
 Single Outdoor Unit
Outdoor
Power supply
(3Ø 4wires)
(Main Switch)
Indoor
Power supply
(1Ø 2wires)
N
L
(2 Wires Cable)
Pull Box
(Installer option)
Power Line
(2 Wires Cable)
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.
84
[Outdoor Unit]
R S T N
Switch
Fuse
Power Line
(4 Wires Cable)
Power Line
Pull Box Pull Box
(Installer option) (Installer option)
Power Line
(2 Wires Cable)
Communication Line
(3 Wires Cable)
[Indoor Units]
Between Indoor and Master Outdoor unit
SODU.B SODU.A IDU.B IDU.A
3
3 4
The GND terminal at the main PCB is a '-' terminal for day contact, it is
not the point to make ground connection.
Communication Line
(2 Wires Cable)
Power Line Power Line
(2 Wires Cable) (2 Wires Cable)
CEN.B CEN.A DRY1 DRY2 GND
4
3 4
Voltage range(V)
Frequency
Outdoor Indoor
60Hz 380V 220V
50Hz 380-415V 220-240V
Master
12V
Outdoor Unit
Outdoor Units