Mitsubishi Electric PAC-AK31BC, Техническое и сервисное руководство

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75
10 ELECTRICAL WIRING
External wiring procedure (Fig.1)
E
Power supply: Single phase 220/230/240V, 50Hz 220V, 60Hz,
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.
Wire diameter Breaker
(A) Main power
line
(B) Earth line
(C) Signal line/
Earth line
Interrupting
current Performance
characteristic
(D) Signal line/
Earth line
6.0 mm² 6.0 mm²
1.5 mm²
+
1/
Min. 1.5 mm²
1.5 mm²/
Min. 1.5 mm²
40 A
40 A, 30 mA
for 0.1sec. or less
When using twisted wire for the wiring, the use of round terminal is required.
w
1 Max 45 m (“Outdoor unit-Branch box # 1” plus “branch box # 1-Branch box # 2”). If 2.5 mm² used, Max 55 m.
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.
L
N
S1
S2
S3 S1
S2
S3
S1
S2
S3 S1
S2
S3
TB3A
S1
S2
S3 S1
S2
S3
TB3B TB2B
S1
S2
S3 S1
S2
S3
TB3C
S1
S2
S3 S1
S2
S3
TB3D
S1
S2
S3 S1
S2
S3
TB3E
(A) (A)
(B)
S1
S2
S3 S1
S2
S3
TB3A
S1
S2
S3
S1
S2
S3
S1
S2
S3
TB3B
S1
S2
S3 S1
S2
S3
TB3C
(C)
(D)
(D)
(D)
(D)
(D)
(D)
(D)
(D)
(C)
Circuit
breaker
Outdoor unit
Indoor unit
Branch box #1
(5- branch type)
<Example>
(In case of 2- branch boxes)
Branch box #2
(3- branch type)
A ROOM
B ROOM
C ROOM
D ROOM
E ROOM
F ROOM
G ROOM
H ROOM
TB2
Warning:
Be sure to connect the power supply cords and connecting
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 insulation to
ground or a poor electrical contact at the intermediate con-
nection point.
(If an intermediate connection is necessary, be sure to take
measures to prevent water from entering the cords and
wires.)
Fig.1
IMPORTANT
Make sure that the current leakage breaker is one com-
patible with higher harmonics.
Always use a current leakage breaker that is compat-
ible with higher harmonics as this unit is equipped
with an inverter.
The use of an inadequate breaker can cause the incor-
rect operation of inverter.