Arub Series Heat Recovery Systems (208-230V & 460V) - LG Multi IV Engineering Manual

Figure 46: Typical Multi V IV Heat Recovery VRF System Power and Communications Wiring Schematic.
3 Phase 3 Wires
Power supply
60Hz 208-230V or
60Hz 460V
Main Switch
Power supply
1 Phase 60Hz
208-230V
L1 L2
Disconnect
• 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.
Between Indoor and Master Outdoor unit
SODU B
A
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)
Communications cables are shielded, grounded at the outdoor unit(s) only. Maintain polarity throughout the communication network.
ARUB SERIES HEAT RECOVERY SYSTEMS
R( L 1) S( L 2) T( L 3 ) R ( L 1) S( L 2) T( L 3 )
Switch Switch
Fused
Disconnect
Fused
Disconnect
Power Line
(2-wire Cable)
Power Line
(3-wire Cable)
Pull box Pull box
(Installer
(Installer
option)
option)
HR unit
Power Line
(2-wire Cable)
SODU A IDU B IDU A INT B INT A
3(A) 4(B)
B
HR unit
©
Master
R ( L 1) S( L 2) T( L 3)
Switch
Fused
Disconnect
Pull box
(Installer
option)
Power Line
Power Line
(2-wire Cable) (2-wire Cable)
Indoor Units
SODU
Master B
Outdoor Unit
SODU
B
3(A) 4(B)
SODU
B
Slave1 Slave2
Communication Line
(2-wire Cable)
Power Line
(2-wire Cable)
Communication Line
(3-wire Cable)
IDU INTERNET DRY1 DRY2 GND
A
A B B A
IDU INTERNET DRY1 DRY2 GND
A
A B B A
IDU INTERNET DRY1 DRY2 GND
A
A B B A
12 V
Master
Outdoor Unit
12 V
Slave1
Outdoor Unit
12 V
Slave2
Outdoor Unit
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