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24
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, mo-
mentary blackout or the power goes on and off while the product is
operating, attach a reversed phase protection circuit locally. Run-
ning 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
CEN. B
CEN. A
DRY1
DRY2
3
4
3
4
Series outdoor units
When the power source is connected
In series between the units.
Power supply
3 Phase 3 Wires
[Master]
(Main Switch)
R S T
Switch
ELCB
Power supply
1 Phase
2 Wires
L
N
Power Line
(3 Wires Cable)
ELCB
Power Line
(2 Wires Cable)
Pull Box
Pull Box
Pull Box
(Installer option)
(Installer option)
(Installer option)
Power Line
Power Line
Power Line
(2 Wires Cable)
(2 Wires Cable)
(2 Wires Cable)
Communication Line
(3 Wires Cable)
[Indoor Units]
When the power source is supplied to Each outdoor unit individually.
Power supply
3 Phase 3 Wires
(Main Switch)
R S T
R S T
Switch
Switch
ELCB
ELCB
Power supply
1 Phase
2 Wires
N
L
Power Line
ELCB
Power Line
(3 Wires Cable)
(2 Wires Cable)
Pull Box
Pull Box
(Installer option)
(Installer option)
Power Line
Power Line
(2 Wires Cable)
(2 Wires Cable)
Communication Line
(3 Wires Cable)
Master
GND
12V
Outdoor Unit
The GND terminal at the
main PCB is a '-' terminal
3
4
for day contact, it is not
the point to make ground
connection.
[Slave]
Communication Line
(2 Wires Cable)
Power Line
(2 Wires Cable)
[Master]
[Slave]
Communication Line
(2 Wires Cable)
Pull Box
(Installer option)
Power Line
Power Line
(2 Wires Cable)
(2 Wires Cable)
[Indoor Units]
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, mo-
mentary 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
Master
SODU. B SODU. A
IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
Outdoor Unit
3
4
3
4
3
4
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 transmission wire
[BUS type]
- Connection of communication
cable must be installed like
below figure between indoor
unit to outdoor unit.
Example) Connection of power and communication cable (UX2)
Left Side
Main power
terminal block
Ground wire
Power/
Ground cable
Over
50mm(1.97inch)
gap
Communication
cable
Front Side 1
Main power
terminal block
Ground wire
Power/
Ground cable
Over
50mm(1.97inch)
gap
Communication cable
Master
SODU. B SODU. A
IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
Outdoor unit
Slave1
SODU. B SODU. A
IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
Outdoor Unit
Slave2
SODU. B SODU. A
IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
Outdoor Unit
[STAR type]
- Abnormal operation can be
caused by communication de-
fect, when connection of com-
munication cable is installed like
below figure(STAR type).
Right Side
Main power
terminal block
Ground wire
Power/
Ground cable
Over
50mm(1.97inch)
gap
Communication
cable
Front Side 2
Main power
terminal block
Ground wire
Power/Ground cable
Communication
Over
cable
50mm(1.97inch) gap
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