Arwn Series Heat Pump Systems (208-230V And 460V) - LG Multi V Water IV Installation Manual

Power Supply
3 Phase, 60Hz
208/230V
or 460V
Main Switch
R
(L1)
Switch
Fuse
Power Supply
1 Phase, 60Hz
208/230V
L1 L2
Power Cable:
Communication Cable:
Communication Cable:
• Never apply line voltage power to the communications cable
terminal block. If contact is made, the system may be damaged.
• Always include some allowance in the wiring length when
terminating. Provide some slack to facilitate removing the electrical
panels while servicing.
• Always ground indoor units to help prevent electrical shock
accidents or communication signal disruption. Do not connect
ground wires to the refrigerant pipes.
Communications Between IDUs and Master WSU
Note: SODU B SODU A
• The GND terminal at the main
circuit board is a negative
terminal for a dry contact
connection. Do not connect
ground wires to this terminal.
3 4
• Ensure the terminal
connections of the master
and slave water source unit
connections are matched,
A terminals to A terminals and
B terminals to B terminals.

ARWN Series Heat Pump Systems (208-230V and 460V)

Power Supply
3 Phase, 60Hz
S T R S T R
(L1)
(L2) 208/230V (L3) (L1) (L2) (L3)
or 460V
Switch Switch
Main Switch
R S T
Fuse Fuse
(L1) (L2) (L3)
Switch
Fuse
Power Supply
1 Phase, 60Hz
208/230V
L1 L2
Pull Box Pull Box
(Installer option)
(Installer
option)
Pull Box
(Installer option)
Power Cable:
IDU B IDU A CEN B CEN A
Communications Between IDUs and Master WSU
Master WSU
SODU B SODU A IDU B IDU A
Indoor Units
3 4 3
3 4 3
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ELECTRICAL CONNECTIONS
CEN B CEN A
Master WSU
S T
(L2) (L3)
R S T R S T
(L1) (L2) (L3)
(L1) (L2) (L3)
Switch Switch
Fuse Fuse
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Indoor Units
• Install a main shutoff switch that interrupts all power sources
simultaneously.
• Operating the system in reversed phase can damage the
compressor or other components. If there is a possibility of
reversed phase, phase loss, momentary blackout, or the power
goes on and off during operation, install a field-supplied phase loss
protection circuit.
Communications Between WSUs
SODU B SODU A
CEN B CEN A
SODU B SODU A
Master WSU
4
Indoor Units
4 3 4
SODU B SODU A
AC Smart or other Central Controller
AC Smart or other Central Controller
Slave 1 WSU Slave 2 WSU
CEN B CEN A
Master WSU Slave 1 WSU
Pull Box
(Installer
option)
Pull Box Pull Box
(Installer (Installer
option) option)
Indoor Units
IDU B IDU A CEN B CEN A
Communications Between WSUs
Master WSU
SODU B SODU A IDU B IDU A
IDU B IDU A CEN B CEN A
Master WSU
Slave 1 WSU
SODU B SODU A IDU B IDU A
IDU B IDU A CEN B CEN A
Slave 1 WSU
Slave 2 WSU
SODU B SODU A IDU B IDU A
Slave 2 WSU
Slave 2 WSU
CEN B CEN A
CEN B CEN A
CEN B CEN A
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