LG ARUM080LTE5 Engineering Product Data Book page 88

Multi V 5
5. Field Wiring
5.1 Heat Recovery System
Example Connection of Communication Cable
 Single Outdoor Unit
Outdoor
Power supply
(3Ø 4wires)
(Main Switch)
Switch
Fuse
Indoor
Power supply
(1Ø 2wires)
N
L
Power Line
(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.
Between Indoor and Master Outdoor unit
SODU.B SODU.A
The GND terminal at the main PCB is a '-' terminal for day contact, it is
not the point to make ground connection.
[Outdoor Unit]
R S T N
Power Line
(4 Wires Cable)
Pull Box Pull Box
(Installer option) (Installer option)
HR unit
Power Line Power Line
(2 Wires Cable) (2 Wires Cable)
[Indoor Units]
IDU.B IDU.A CEN.B
3(A) 4(B) 3 4
HR unit
Frequency
60Hz
50Hz
Communication Line
(2 Wires Cable)
Power Line
(2 Wires Cable)
Communication Line
(3 Wires Cable)
CEN.A DRY1 DRY2 GND 12V
3 4
Outdoor Units
Voltage range(V)
Outdoor Indoor
380 220
380-415 220-240
Master
Outdoor Unit
81