LG Multi V 5 Engineering Manual

84 | ELECTRICAL CONNECTIONS
MULTI V 5 Outdoor Unit Engineering Manual
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Figure 22: Example of a Typical Heat Pump Operation Power Wiring and Communications Cable Schematic.
SYSTEM FOR HEAT PUMP
OPERATION, 208-230V AND 460V
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)
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
Fused
Disconnect
Pull box
(Installer
option)
Pull box
(Installer
option)
Pull box
(Installer option)
R(L1) S(L2)
T(L3)
R(L1) S(L2)
T(L3)
R(L1) S(L2)
T(L3
)
L1 L2
Fused
Disconnect
Fused
Disconnect
Disconnect
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
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• Install a main shutoff switch that interrupts all power sources simultaneously. There is risk of fire, electric shock, explosion, physical injury
or death.
• Communication cable between Master ODU to Slave ODU(s), and Master ODU to IDUs to be 18 AWG, 2-conductor, twisted, stranded,
shielded. Ensure the communication cable shield is properly grounded to the Master ODU chassis only.
Do not ground the ODU to IDUs
communication cable at any other point. Wiring must comply with all applicable local and national codes. Inadequate connections may
generate heat, cause a fire, and physical injury or death.
• The GND terminal at the main PCB is a negative terminal for dry contact, not a ground. Inadequate connections may generate heat, cause
a fire, and physical injury or death.
WARNING
• Make sure that the terminal numbers of master outdoor unit and slave outdoor unit(s) match (A to A, B to B). The system will malfunction if
not properly wired.
• Maintain polarity throughout the communication network. The system will malfunction if not properly wired.
• 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
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Heat Pump Operation
Communications Cable Between Master Outdoor Unit and Indoor Unit
B
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
AB
A
BA
Master
Outdoor Unit Communication Terminal Block
B
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
AB
A
BA
B
DRY1 DRY2 GND 12V
AB
A
BA
B
DRY1 DRY2 GND 12V
ABA
4(B)
3(A)
4(B)
3(A)
B
A
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
Master
Outdoor Unit Communication Terminal Block
Slave 1
Outdoor Unit Communication Terminal Block
Slave 2
Outdoor Unit Communication Terminal Block
Indoor Unit Indoor Unit
ODU IDU CENTRAL
ODU IDU CENTRAL

LG Multi V 5 Specifications

General

Type	VRF (Variable Refrigerant Flow)
Refrigerant	R410A
Compressor Type	Inverter Scroll Compressor
Outdoor Unit Fan Type	Axial Fan
Cooling Capacity	22.4 kW to 270 kW
Energy Efficiency	High
Operating Range	Cooling: -5°C to 48°C
Power Supply	380-415V, 50/60Hz
Heat Exchanger Type	Microchannel
Control Type	Centralized Control
Indoor Unit Options	Cassette, Wall Mounted, Ducted
Heat Recovery	Available
Warranty	Varies by region (typically 5 years compressor, 1-2 years parts)