LG ARUN BTE4 Series Installation Manual page 22

22
WARNING
!
When the total capacity is over than as follow, the power source
do not use in series between the 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
1Phase 2Wires
L N
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)
! 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 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)
[Master] [Slave]
Communication Line
(2 Wires Cable)
Pull Box
(Installer option)
Power Line Power Line
(2 Wires Cable) (2 Wires Cable)
[Indoor Units]
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
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
Main Power Connection
Main power
terminal block
Insulation sleeves
attachments
Fix firmly not
to be displaced
! 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 (UX3)
Left Side
Main power
wer
terminal block
Ground wire e
Power/
Ground cable
Over
50mm(1.97inch)
gap
Communication
cable
[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
Communication Connection
ODU-IDU
Communication cable
ODU-ODU
Communication cable
Right Side
Main power
terminal block
Ground wire
Power/
Ground cable
Over
50mm(1.97inch)
gap
Communication
cable