LG Multi V 5 Engineering Manual

ELECTRICAL CONNECTIONS | 85
Electrical Connections
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Figure 23: Example of a Typical Heat Recovery Operation Power Wiring and Communications Cable Schematic.
WARNING
Heat Recovery Unit
3(A) 4(B)
A B 3(A) 4(B)
B
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
AB
A
BA
B
DRY1 DRY2 GND 12 V
AB
A
BA
B
DRY1 DRY2 GND 12 V
ABA
B
A
Heat Recovery Operation
Communications Cable Between Master Outdoor Unit and
Heat Recovery Units / Indoor Units
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
B
ODU IDU
CENTRAL
DRY1 DRY2 GND 12V
AB
A
BA
Master
Outdoor Unit Communication Terminal Block
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
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
Fused
Disconnect
Fused
Disconnect
Fused
Disconnect
Disconnect
SYSTEM FOR HEAT RECOVERY
OPERATION, 208-230V AND 460V
• Ground wiring is required to prevent accidental electrical shock during current leakage, communication problems from electrical noise, and
motor current leakage. 'RQRWFRQQHFWWKHJURXQGOLQHWRWKHSLSHV7KHUHLVULVNRI¿UHHOHFWULFVKRFNH[SORVLRQSK\VLFDOLQMXU\RUGHDWK
• 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 / HRUs to be 18 AWG, 2-conductor, twisted, strand-
ed, shielded. Ensure the communication cable shield is properly grounded to the Master ODU chassis only.
Do not ground the ODU to
IDUs / HRUs communication cable at any other point. Wiring must comply with all applicable local and national codes. Inadequate connec-
tions 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.
• 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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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)