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Electrical System Installation
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ARWN Series Heat Pump Systems (208-230V and 460V)
ELECTRICAL CONNECTIONS
Master WSU
Main Switch Slave 1 WSU Slave 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
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Power Cable:
Communication Cable:
CEN B CEN A
AC Smart or other Central Controller
Communications Between WSUs
Master WSU
CEN B SODU B
Slave 1 WSU
CEN A IDU AIDU BSODU A
CEN B SODU B CEN A IDU AIDU BSODU A
CEN B SODU B
Slave 2 WSU
CEN A IDU AIDU BSODU A
3 4 3 4
Communications Between IDUs and Master WSU
Master WSU
Indoor Units
CEN B SODU B CEN A IDU AIDU BSODU A
3 4
Master WSU
Indoor Units
Main Switch Slave 1 WSU Slave 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
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Pull Box
(Installer
option)
Power Cable:
Communication Cable:
CEN B CEN A
AC Smart or other Central Controller
Communications Between WSUs
Master WSU
CEN B SODU B
Slave 1 WSU
CEN A IDU AIDU BSODU A
CEN B SODU B CEN A IDU AIDU BSODU A
CEN B SODU B
Slave 2 WSU
CEN A IDU AIDU BSODU A
3 4 3 4
Communications Between IDUs and Master WSU
Master WSU
Indoor Units
CEN B SODU B CEN A IDU AIDU BSODU A
• 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.
• 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.
• 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.
• 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.
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