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Field Wiring
Outdoor
Power supply
(3-phase 4-wire)
(Main Switch)
Indoor
Power supply
(1-phase 2-wire)
N
L
Pull Box
(Installer option)
Power cable
(2-wire Cable)
WARNING
!
• Indoor Unit ground wires 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 Outdoor unit
SODU B SODU A
IDU B
IDU A
INT B
3
4
3
4
[Outdoor Unit]
R S T N
Switch
Fuse
Power cable
(4-wire Cable)
Power cable
(2-wire Cable)
Pull Box
(Installer option)
Power cable
(2-wire Cable)
Communication cable
(3-wire Cable)
[Indoor Units]
Outdoor Unit
INT A
3
4
Frequency
60 Hz
50 Hz
Communication cable
Pull Box
Pull Box
(Installer option)
(Installer option)
Power cable
Power cable
(2-wire Cable)
(2-wire Cable)
The GND terminal at the main PCB is a '-'
terminal for day contact, it is not the point to
make ground connection.
ELECTRICAL WIRING
Voltage range(V)
Outdoor
Indoor
380 V
220 V
380 ~ 415 V
220 ~ 240 V
(2-wire Cable)
57
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