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6
ELECTRICAL CONNECTION
• Consult local building codes, NEC (National Electrical Code) or CEC (Canadian Electrical Code) for special
requirements.
• If incorrect / incomplete wiring is carried out, it will cause an electrical fi re or smoke.
• Install circuit breaker is not tripped by shock waves. If circuit breaker is not installed, an electric shock may be
caused.
• Use the cord clamps attached to the product.
• Do not damage or scratch the conductive core and inner insulator of power and communication wires when
peeling them.
• Use the power cord and communication wire of specifi ed thickness, type, and protective devices required.
• Do not connect 208 / 230 V power to the terminal blocks (A, B) for communication wiring. (Otherwise, the
system will fail.)
• Perform the electric wiring so that it does not come to contact with the high-temperature part of the pipe. The
coating may melt resulting in an accident.
• Be sure to connect ground wire. (Grounding work)
Do not connect the ground wire to gas pipe, city water pipe, lightning rod, or the ground wire of telephone.
Incomplete grounding causes an electric shock.
• For electric work, strictly follow to the Local Regulation in each country and the Installation Manual, and use an
exclusive circuit.
Capacity shortage of power circuit or incomplete installation may an electric shock or fi re.
REQUIREMENT
• For power supply wiring, strictly conform to the Local Regulation in each country.
• After connecting wires to the terminal blocks, provide a trap and fix wires with the cord clamp.
• Run the refrigerant piping line and communication wiring line in the same line.
• Do not turn on the power of the Flow Selector unit until vacuuming of the refrigerant pipes completes.
Power supply wire and communication wires specifications
Power supply wire and communication wires are locally procured.
For the power supply specifications, follow to the table below. If capacity is little, it is dangerous because overheat
or burnout may be caused.
Power supply
• Power supply wire specification: Cable 3-core, AWG12.
P
o
w
r e
s
u
p
p
y l
Power supply switch / circuit breaker or power supply wiring / fuse rating for Flow Selector units should be selected by the
accumulated total current values of the Flow Selector units.
P
o
w
r e
s
u
p
p
y l
w
r i
n i
g
Communication wiring
• 2-core with non-polarity wire is used for wiring of the communication wiring.
• Wire size : AWG14 to 20
• Up to 656' (200 m) total length of wiring between indoor units and Flow selector unit. (L2 + L3)
• Up to 984' (300 m) (L1 + L2 + L3)
• Up to 984' (300 m) (L1)
EN-17
WARNING
208 / 230 V-1-60 Hz
Below 164' (50 m)
AWG12
9
NOTE
• Use copper supply wire.
• Use UL wire rated 600 V for the power supply.
• Use UL wire rated 300 V for the remote control wires and control wires.
U1 U2
U1 U2
Indoor unit
A
B
L1
Remote control
Connectable number of indoor units per group control connection
The number of maximum connectable indoor units through a single remote control is 8 units.
Indoor unit
N
o
1 .
N
o
2 .
N
o
A
B
A
B
A
(A.B)
Remote control
A B
FS unit
In case that two remote controls are connected, the number of maximum connectable indoor units is 7 units.
Indoor unit
N
o
1 .
N
o
2 .
N
o
A
B
A
B
A
(A.B)
Remote control
(Main)
A B
FS unit
* The maximum connection number of remote control per group is 2 pieces.
* The number of maximum connected indoor units should be less than the maximum connectable capacity of a
FS unit.
The communication wiring and AC 208/230 V wires cannot be parallel to contact each other and cannot be
stored in the same conduits. If doing so, a trouble may be caused on the control system due to noise or
other factor.
U1 U2
A
B
A
B
L2
L3
A B
FS unit
3 .
N
o
4 .
N
o
7 .
B
A
B
A
B
3 .
N
o
4 .
N
o
7 .
B
A
B
A
B
Remote control
CAUTION
N
o
8 .
A
B
(Sub)
EN-18
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