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7. Electrical work
<Example> (In case of 2-branch boxes)
■
140-160V
Outdoor unit
(A)
(A)
L
N
(C)
Circuit
S1
(B)
breaker
S2
S3
(C)
Warning:
In case of A-control wiring, 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 outdoor unit and branch box/indoor unit and branch box, please use 3-poles type.
Caution:
After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the branch
box(es) or indoor units.
WIRING SPECIFICATIONS
(OUTDOOR-BRANCH BOX CONNECTING CABLE)
Cross section of cable
Wire size (mm
Round
Flat
Flat
Round
*1 : Power supply cords of appliances shall not be lighter than design 60245 IEC or
227 IEC.
*2 : In case that cable with stripe of yellow and green is available.
*3 : In case of regular polarity connection (S1-S2-S3), wire size is 1.5 mm
*4 : In case of regular polarity connection (S1-S2-S3).
*5 : In the flat cables are connected as this picture, they can be used up to 55 m.
Be sure to connect the outdoor-branch box/indoor-branch box connecting cables directly to the units (no intermediate connections).
Intermediate connections can lead to communication errors if water enters the cables and causes insufficient insulation 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 cables.)
Branch box*1
(5-branch type)
Indoor unit
TB3A
A ROOM
(D)
S1
S1
S2
S2
S3
S3
TB2B
TB3B
B ROOM
(D)
S1
S1
S1
S2
S2
S2
S3
S3
S3
TB3C
C ROOM
(D)
S1
S1
S2
S2
S3
S3
TB3D
(D)
D ROOM
S1
S1
S2
S2
S3
S3
TB3E
E ROOM
(D)
S1
S1
S2
S2
S3
S3
Indoor unit
TB3A
F ROOM
(D)
S1
S1
S2
S2
S3
S3
TB3B
G ROOM
(D)
S1
S1
TB2B
S2
S2
S1
S3
S3
S2
S3
TB3C
H ROOM
(D)
S1
S1
S2
S2
S3
S3
Branch box*2
(3-branch type)
Power supply
Isolator (Switch)
S1
S2
Outdoor unit
S3
2
)
Number of wires
2.5
3
2.5
3
1.5
4
2.5
4
2
.
■
140-160Y
Outdoor unit
(A)
(A)
Circuit
(B)
breaker
Fig. 7-2
3 poles isolator (Switch)
S1
S1
Branch
S2
S2
box
S3
S3
Polarity
Clockwise : S1-S2-S3
* Pay attention to stripe of yellow and green
Not applicable
(Because centre wire has no cover finish)
From left to right : S1-Open-S2-S3
Clockwise : S1-S2-S3-Open
*Connect S1 and S3 to the opposite angl
S1
S2 S3
*6 : Mentioned cable length is just a reference value.
It may be different depending on the condition of installation, Humidity or materials,
etc.
Branch box*1
(5-branch type)
Indoor unit
TB3A
(D)
S1
L1
S2
L2
S3
L3
N
TB2B
TB3B
(C)
(D)
S1
S1
S1
S2
S2
S2
S3
S3
S3
TB3C
(D)
S1
S2
S3
TB3D
(D)
S1
S2
S3
TB3E
(D)
(C)
S1
S2
S3
Indoor unit
TB3A
(D)
S1
S2
S3
TB3B
(D)
S1
TB2B
S2
S1
S3
S2
S3
TB3C
(D)
S1
S2
S3
Branch box*2
(3-branch type)
S1
"A-control"
S2
Indoor unit
S3
Not applicable
(3C Flat cable × 2)
A ROOM
S1
S2
S3
B ROOM
S1
S2
S3
C ROOM
S1
S2
S3
D ROOM
S1
S2
S3
E ROOM
S1
S2
S3
F ROOM
S1
S2
S3
G ROOM
S1
S2
S3
H ROOM
S1
S2
S3
L (m)*6
(50)
*2
*5
(45)
*3
(55)
*4
13
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