LG Multi V Water V ARWM072CAS5 Engineering Manual page 23

SYSTEM FOR HEAT PUMP
CONFIGURATION, 575V
Figure 9: Example of a Typical Heat Pump Configuration Power Wiring and Communications Cable Schematic.
Power Supply
3 Phase, 60Hz
575V
Main Switch
R S T R S T R S T
(L1) (L2) (L3) (L1) (L2) (L3) (L1) (L2) (L3)
Switch Switch Switch
Fused
Fused Fused
Disconnect
Disconnect Disconnect
Power Supply
1 Phase, 60Hz
208/230V
L1 L2
Pull Box Pull Box
(Installer option)
(Installer
option)
Power Cable:
Communication Cable:
WARNING
Indoor Units
• 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 fire, 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 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.
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.
Heat Pump Operation
Communications Cable Between Master Outdoor Unit and Indoor Unit
Master Outdoor Unit Communication Terminal Block
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
A
B A B B A
4(B)
3(A) 4(B) 3(A)
Indoor Unit Indoor Unit
• Make sure that the terminal numbers of master water source unit and slave 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 field-supplied phase loss protection circuit. Operating the system in reverse phase may break the compressor and other unit components.
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. "LG" is a registered trademark of LG Corp.
42 | ELECTRICAL CONNECTIONS
Master WSU Slave 1 WSU Slave 2 WSU
Pull Box Pull Box
(Installer (Installer
option) option)
Do not ground the ODU to IDUs
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
Master Outdoor Unit Communication Terminal Block
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
A
B A B B A
Slave 1 Outdoor Unit Communication Terminal Block
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
A
B A B B A
Slave 2 Outdoor Unit Communication Terminal Block
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
A
B A B B A
Figure 10: Example of a Typical Heat Recovery Configuration Power Wiring and Communications Cable Schematic.
Power Supply
3 Phase, 60Hz
575V
Main Switch
R S T
R S T R S T
(L1) (L2) (L3) (L1) (L2) (L3) (L1) (L2) (L3)
Switch Switch Switch
Fuse Fuse Fuse
Power Supply
1 Phase, 60Hz
208/230V
L1 L2
Pull Box Pull Box
(Installer option)
(Installer
option)
Power Cable:
Communication Cable:
Heat
Recovery
WARNING
Unit
• 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 fire, 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 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.
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.
Heat Recovery Operation
Communications Cable Between Master Outdoor Unit and
Heat Recovery Units / Indoor Units
Master Outdoor Unit Communication Terminal Block
ODU IDU DRY1 DRY2 GND 12 V
CENTRAL
B A B A B A
A B 3(A) 4(B) 3(A) 4(B)
Heat Recovery Unit Indoor Unit Indoor Unit
• Make sure that the terminal numbers of master water source unit and slave 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 field-supplied phase loss protection circuit. Operating the system in reverse phase may break the compressor and other unit components.
© LG Electronics Canada, Inc., North York, ON Canada. All rights reserved. "LG" is a registered trademark of LG Corp.
SYSTEM FOR HEAT RECOVERY
CONFIGURATION, 575V
Master WSU Slave 1 WSU
Slave 2 WSU
For Heat Recovery Unit information, refer
Pull Box Pull Box
(Installer (Installer
to the applicable Engineering Manual on
option) option)
www.lghvac.com.
Indoor Units
Do not ground the ODU to
Communications Cable Between Master Outdoor Unit and Slave Outdoor Unit(s)
Master Outdoor Unit Communication Terminal Block
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
B A B A B A
Slave 1 Outdoor Unit Communication Terminal Block
ODU IDU CENTRAL DRY1 DRY2 GND 12 V
A
B A B B A
Slave 2 Outdoor Unit Communication Terminal Block
DRY1 DRY2 GND 12 V
ODU IDU CENTRAL
B A B A B A
ELECTRICAL CONNECTIONS | 43