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Example) Connection of communication cable
[BUS type]
[STAR type]
When the power source is supplied to Each outdoor unit individually.
L
N
Communication cable
(2 Wires Cable)
Power cable
(4 Wires Cable)
Communication cable
(3 Wires Cable)
Power cable
(2 Wires Cable)
Power cable
(2 Wires Cable)
Power cable
(2 Wires Cable)
Power cable
(2 Wires Cable)
Power cable
(2 Wires Cable)
[Master]
[Indoor Units]
Outdoor
Power supply
(3Ø 4wires)
Indoor
Power supply
(1Ø 2wires)
(Main Switch)
[Slave1]
[Slave2]
R S T N
Switch
Fuse
R S T N
Switch
Fuse
R S T N
Switch
Fuse
Pull Box
(Installer option)
Pull Box
(Installer option)
Pull Box
(Installer option)
Pull Box
(Installer option)
Slave1
Outdoor Unit
Master
Outdoor unit
Slave2
Outdoor Unit
Slave3
Outdoor Unit
SODU. B SODU. A IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
SODU. B SODU. A IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
SODU. B SODU. A IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
SODU. B SODU. A IDU. B
IDU. A
CEN. B
CEN. A
DRY1
DRY2
GND
12V
3
4
3
4
3
4
Master
Outdoor Unit
SODU.B SODU.A
IDU.B IDU.A
CEN.B
CEN.A
DRY1
DRY2
GND
12V
Between Indoor and Master Outdoor unit
The communication cables between indoor unit and master outdoor
unit are possible to connect with BUS type or STAR type.
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)
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.
!
WARNING
When the total capacity is over than 68HP, Do not use single
power source for connecting series units.
The First terminal block could be burnt out.
!
- Connection of communication
cable must be installed like
below figure between indoor
unit to outdoor unit.
- Abnormal operation can be
caused by communication de-
fect, when connection of com-
munication cable is installed like
below figure(STAR type).
Frequency
Voltage range(V)
Outdoor
Indoor
60 Hz
380 V
220 V
50 Hz
380~415 V 220~240 V
CAUTION
It should be wiring power cables or communication cables to
avoid interference with the oil level sensor. Otherwise, That oil
level sensor would be operated abnormally.
!
Example) Connection of power and communication cable (UXA)
Gap : Over
50mm(1.97’’)
When connecting
Main power lines
/ Ground wire from left side
When connecting
Communication wires
/ Ground wire from left side
Main power
terminal block
Ground wire
Main power
terminal block
Insulation sleeves
attachments
Ground wire
Ground wire
ODU-IDU
Communication
cable
ODU-ODU
Communication
cable
Bottom Side
Main power
terminal block
Ground wire
When connecting
Communication wires
/ Ground wire from
front guide panel
When connecting
Main power lines
/ Ground wire from
front guide panel
Gap : Over
50mm(1.97’’)
Front Side
Fix firmly with cable tie or
clamp cord not to be displaced
Main power line
connection
Communication/Ground
wire connection
1,MFL67221438,영영 2018. 10. 4. 영영 11:29 Page 25
