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Arun Series Heat Pump Systems (208-230v & 460v) - LG Multi IV Engineering Manual

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ARUN SERIES HEAT PUMP SYSTEMS
Figure 45: Typical Multi V IV Heat Pump VRF System Power and Communications Wiring Schematic.
3 Phase 3 Wires
Power supply
60Hz 208-230V or
60Hz 460V
Main Switch
Switch
Fused
Power supply
Disconnect
1 Phase 60Hz
208-230V
L1 L2
Disconnect
Power Line
(2-wire Cable)
• 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.
Heat Pump
Between Indoor and Master Outdoor unit
SODU
IDU
A
B
A
B
4(B)
3(A)
The GND terminal at the main PCB is a negative
terminal for dry contact, not a ground.
• 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.
148 |
R(L1) S(L2) T(L3)
R(L1) S(L2) T(L3)
Switch
Switch
Fused
Disconnect
Disconnect
Power Line
(3-wire Cable)
Pull box
Pull box
(Installer option)
(Installer
option)
Power Line
Power Line
(2-wire Cable)
(2-wire Cable)
Communication Line
(3-wire Cable)
INTERNET
DRY1 DRY2 GND
12 V
B
A
3(A)
4(B)
©
Master
R(L1) S(L2) T(L3)
Fused
Pull box
(Installer
option)
Power Line
(2-wire Cable)
Indoor Units
SODU
IDU
Master
Outdoor Unit
A
B
A
B
SODU
IDU
A
B
A
B
SODU
IDU
A
A
B
B
Slave1
Slave2
Communication Line
(2-wire Cable)
Power Line
(2-wire Cable)
INTERNET
DRY1 DRY2 GND
12 V
Master
Outdoor Unit
B
A
INTERNET
DRY1 DRY2 GND
12 V
Slave1
Outdoor Unit
B
A
INTERNET
DRY1 DRY2 GND
12 V
Slave2
Outdoor Unit
B
A

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