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6
ELECTRICAL CONNECTION
• If incorrect / incomplete wiring is carried out, it will cause an electrical fire or smoke.
• 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 specified thickness, type, and protective devices required.
• Do not connect 220-240 V power to the terminal blocks ( ,
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 earth wire. (Grounding work)
Do not connect the earth wire to gas pipe, city water pipe, lightning rod, or the earth 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 fire.
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 2.5 mm², in conformity with Design 60245 IEC 57.
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 : 0.5 mm² to 2.0 mm²
• Up to 200 m total length of wiring between indoor units and Flow selector unit. (L2 + L3)
• Up to 300 m (L1 + L2 + L3)
• Up to 300 m (L1)
EN-51
WARNING
) for communication wiring. (Otherwise, the system
2
2
0
2 -
4
0
V
, ~
5
0
H
z
B
e
o l
w
5
0
m
2
5 .
m
m
²
U1 U2
U1 U2
Indoor unit
A
B
L1
Remote controller
Connectable number of indoor units per group control connection
The number of maximum connectable indoor units through a single remote controller is 8 units.
Indoor unit
N
o
1 .
N
o
2 .
N
o
3 .
A
B
A
B
A
(A.B)
Remote controller
A B
FS unit
In case that two remote controllers are connected, the number of maximum connectable indoor units is 7 units.
Indoor unit
N
o
1 .
N
o
2 .
N
o
3 .
A
B
A
B
A
(A.B)
Remote controller
(Main)
A B
FS unit
* The maximum connection number of remote controller 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 220-240 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.
26
U1 U2
A
B
A
B
L2
L3
A B
FS unit
N
o
4 .
N
o
7 .
N
o
B
A
B
A
B
A
N
o
4 .
N
o
7 .
B
A
B
A
B
Remote controller
(Sub)
CAUTION
8 .
B
EN-52
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