LG MULTI V WATER 5 ARW Series User Manual

ELECTRICAL CONNECTIONS | 63
Electrical Connections
Due to our policy of continuous product innovation, some specications may change without notication.
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Figure 10: Example of a Typical Heat Recovery Operation Power Wiring and Communications Cable Schematic.
WARNING
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. Do not connect the ground line to the pipes. There is risk of re, electric shock, explosion, physical injury or death.
• 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 Main ODU to Sub ODU(s), and Main ODU to IDUs / HRUs to be 18 AWG, 2-conductor, twisted, stranded,
shielded. Ensure the communication cable shield is properly grounded to the Main 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 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.
• Make sure that the terminal numbers of main water source unit and sub water source 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
a eld-supplied phase loss protection circuit. Operating the system in reverse phase may break the compressor and other unit components.
Figure 11: Close-up of Heat Recovery Operation Communications Cable Schematic.
Heat Recovery Unit
3(A) 4(B)
A B 3(A) 4(B)
B
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
A B
A
B A
B
DRY1 DRY2 GND 12 V
A B
A
B A
B
DRY1 DRY2 GND 12 V
A B A
B
A
Heat Recovery Operation
Communications Cable Between Main Outdoor Unit and
Heat Recovery Units / Indoor Units
Communications Cable Between Main Outdoor Unit and Sub Outdoor Unit(s)
B
ODU IDU
CENTRAL
DRY1 DRY2 GND 12 V
A B
A
B A
Main Outdoor Unit Communication Terminal Block
Main
Outdoor Unit Communication Terminal Block
Sub 1
Outdoor Unit Communication Terminal Block
Sub 2
Outdoor Unit Communication Terminal Block
Indoor Unit Indoor Unit
ODU IDU CENTRAL
ODU IDU CENTRAL
Main WSU
Indoor Units
Main Switch
Sub 1 WSU
Sub 2 WSU
Pull Box
(Installer option)
R
(L1)
L1
L2
Switch
Fuse
Switch
Fuse
Switch
Fuse
S
(L2)
T
(L3)
R
(L1)
S
(L2)
T
(L3)
R
(L1)
S
(L2)
T
(L3)
Power Supply
3 Phase, 60Hz
208/230V
or 460V
Power Supply
1 Phase, 60Hz
208/230V
Heat
Recovery
Unit
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Power Cable:
Communication Cable:

LG MULTI V WATER 5 ARW Series Specifications

General

Brand	LG
Model	MULTI V WATER 5 ARW Series
Category	Heat Pump
Language	English