LG Multi IV - ARUB Series Heat Recovery Systems (208-230 V & 460 V)

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Electrical Connections
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Switch
Communication Line
(2-wire Cable)
Power Line
(3-wire Cable)
Communication Line
(3-wire Cable)
Power Line
(2-wire Cable)
Power Line
(2-wire Cable)
Power Line
(2-wire Cable)
Power Line
(2-wire Cable)
Master
Indoor Units
Power supply
3 Phase 3 Wires
60Hz 208-230V or
60Hz 460V
Power supply
1 Phase 60Hz
208-230V
Main Switch
Slave1 Slave2
Switch Switch
Pull box
(Installer
option)
Pull box
(Installer
option)
Pull box
(Installer
option)
Power Line
(2-wire Cable)
HR unit
R(L1) S(L2) T(L3 R) (L1) S(L2) T(L3 R) (L1) S(L2) T(L3)
L1 L2
The GND terminal at the main PCB is a negative terminal
for dry contact, not a ground line.
• Make sure that terminal number of master and slave outdoor units
match. (A-A,B-B)
Between Indoor and Master Outdoor unit
Master
Outdoor Unit
SODU B SODU A IDU B IDU A INT B INT A
HR unit
3(A) 4(B)
AB
Fused
Disconnect
Fused
Disconnect
Fused
Disconnect
Disconnect
3(A) 4(B)
B
SODU IDU INTERNET DRY1 DRY2 GND 12 V
AB
A
BA
Master
Outdoor Unit
B
SODU IDU INTERNET DRY1 DRY2 GND 12 V
AB
A
BA
Slave1
Outdoor Unit
B
SODU IDU INTERNET DRY1 DRY2 GND 12 V
ABA
Slave2
Outdoor Unit
B
A
ARUB SERIES HEAT RECOVERY SYSTEMS
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise,
and motor current leakage . Do not connect the ground line to the pipes.
• Install a main shutoff switch that interrupts all power sources simultaneously.
• If the system operates in reversed phase, it may break the compressors and other components.
• If there is a possibility of reversed phase, phase loss, momentary blackout, or the power goes on and off while the system is operating,
install a field-supplied phase loss protection circuit. Operating the system in reverse phase may break the compressor and other unit
components.
Communications cables are shielded, grounded at the outdoor unit(s) only. Maintain polarity throughout the communication network.
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Figure 46: Typical Multi V IV Heat Recovery VRF System Power and Communications Wiring Schematic.