LG Multi V ARWN Series Installation Manual page 25

Series outside unit s
When the power source is supplied to Each outside unit individually.
Outside
Power supply
(3Ø 4wires)
(Main Switch)
R S T N R S T N R S T N
Switch Switch Switch Switch
Fuse Fuse Fuse
Indoor
Power supply
(1Ø 2wires)
L N
Power cable
(2 Wires Cable)
Power cable
(4 Wires Cable)
Pull Box Pull Box
(Installer option) (Installer option)
Power cable
(2 Wires Cable)
Voltage range(V)
Frequency
Outside Indoor
60Hz 380V 220V
50Hz 380-415V 220-240V
! 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.
[Heat Pump]
Between Indoor and Master Outside unit
Master
SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2 GND 12V
Outside 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 outside unit s
are matched.(A-A,B-B)
[Master] [Slave1] [Slave2]
R S T N
Fuse
Pull Box Pull Box
(Installer option) (Installer option)
Power cable Power cable Power cable
(2 Wires Cable) (2 Wires Cable) (2 Wires Cable)
Communication cable
(3 Wires Cable)
[Indoor Units]
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
u Example Connection of Communication Cable
[BUS type]
- Connection of communication
cable must be installed like
below figure between indoor
unit to outside unit .
[Slave3]
Communication cable
(2 Wires Cable)
Example) Connection of power and communication cable (UWC)
Main Power Connection
Main power
terminal block
Master
Insulation sleeves
Outside unit
attachments
Fix firmly not
Slave1
to be displaced
Outside unit
Slave2
! CAUTION
Outside unit
It should be wiring power cables or communication cables to avoid
Slave3
interference with the oil level sensor. Otherwise, That oil level sensor
Outside unit
would be operated abnormally.
25
[STAR type]
- Abnormal operation can be
caused by communication de-
fect, when connection of com-
munication cable is installed like
below figure(STAR type).
Main power
terminal block
Ground wire
Power/
Ground cable
Over
50mm gap
Communication
cable
Communication Connection
ODU-IDU
Communication cable
ODU-ODU
Communication cable