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9
ELECTRICAL WIRING
9-1. External wiring procedure (Fig. 9-1)
E Power supply: 140/160V Single 220/230/240, 50 Hz 220V, 60Hz,
140/160Y 3-phase 380/440/415V, 50Hz
Max. Permissive system Impedance : 0.22(")
Note:
1 Power supply input: Outdoor unit only. Connect the lines (C), (D) in accordance with the terminal block names to ensure
correct polarity.
2 As for lines (C), S1 and S2 are for connecting the power source. And S2 and S3 are for signals. S2 is a common cable for
the power source and signal.
(A) Main power
line
Model
140/160V
6.0 mm²
140/160Y
1.5 mm²
When using twisted wire for the wiring, the use of round terminal is required.
w1 Max 45 m ("Outdoor unit-Branch box
Notes: 1. Wiring size must comply with the applicable local and national code.
2. Power supply cords and Indoor unit/Branch box/Outdoor unit connecting cords shall not be lighter than polychloro-
prene sheathed flexible cord. (Design 60245 IEC 57)
3. Install an earth line longer than power cables.
Warning:
There is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between
power line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch
the S1, S2, S3 terminals when the power is energized. If isolator should be used between indoor unit, branch box and outdoor
unit, please use 3-pole type.
<Example 1>
(In case of 2- branch boxes)
■
For 140-160V
Outdoor unit
(A)
(A)
L
N
Circuit
(C)
breaker
S1
(B)
S2
S3
■
For 140-160Y
Outdoor unit
(A)
(A)
L1
L2
L3
(C)
N
Circuit
(C)
breaker
S1
(B)
S2
S3
Fig. 9-1
OCH480A
Wire diameter
(C) Signal line/
(B) Earth line
Earth line
1.5 mm² w1/
6.0 mm²
Min. 1.5 mm²
1.5 mm² w1/
1.5 mm²
Min. 1.5 mm²
#
1" plus "branch box
Branch box #1
(5- branch type)
Indoor unit
TB3A
(D)
A ROOM
S1
S1
S2
S2
S3
S3
TB2B
TB3B
(D)
B ROOM
S1
S1
S1
S2
S2
S2
S3
S3
S3
TB3C
(D)
C ROOM
S1
S1
S2
S2
S3
S3
TB3D
(D)
D ROOM
S1
S1
S2
S2
S3
S3
TB3E
(D)
E ROOM
S1
S1
S2
S2
S3
S3
TB3A
(D)
F ROOM
S1
S1
S2
S2
S3
S3
TB3B
(D)
G ROOM
S1
S1
TB2
S2
S2
S1
S3
S3
S2
S3
TB3C
(D)
H ROOM
S1
S1
S2
S2
S3
S3
Branch box #2
(3- branch type)
(D) Signal line/
Earth line
1.5 mm²/
Min. 1.5 mm²
1.5 mm²/
Min. 1.5 mm²
#
#
1-Branch box
2"). If 2.5 mm² used, Max 55 m.
Warning:
Be sure to connect the power supply cords and con-
necting wires for the indoor units, outdoor units, branch
boxes directly to the units (no intermediate connections).
Intermediate connections can lead to communication
errors in the cords or wires and causes insufficient insu-
lation to ground or a poor electrical contact at the inter-
mediate connection point.
(If an intermediate connection is necessary, be sure to
take measures to prevent water from entering the cords
and wires.)
IMPORTANT
Make sure that the current leakage breaker is one
compatible with higher harmonics.
Always use a current leakage breaker that is
compatible with higher harmonics as this unit is
equipped with an inverter.
The use of an inadequate breaker can cause the
incorrect operation of inverter.
54
Breaker
Interrupting
Performance
current
characteristic
40 A, 30 mA
40 A
for 0.1 sec. or less
25 A, 30 mA
25 A
for 0.1 sec. or less
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