10
8. Electrical work
L1
L1
L2
M1
M2
L1
L2
S1
S2
S3
TB3A
S1
S2
S3
L2
Outdoor unit
Circuit breaker
M-NET Branch BOX #1
(5-branches type)
Indoor unit
S1
S2
S3
TB3B
S1
S2
S3
S1
S2
S3
TB3C
S1
S2
S3
S1
S2
S3
TB3D
S1
S2
S3
S1
S2
S3
TB3E
S1
S2
S3
TB2B
C ROOM
D ROOM
TB5
S1
S2
S3
TB3A
S1
S2
S3
Indoor unit
S1
S2
S3
TB3B
S1
S2
S3
S1
S2
S3
TB3C
S1
S2
S3
C ROOM
TB2B
TB5
L1
L2
M1
M2
S
E
E
Circuit breaker
P
ull
b
ox
Pu
ll
bo
x
(A)
(A)
(B)
(C)
(C)
(C)
(C)
(C)
(C)
(C)
(C)
A ROOM
B ROOM
E ROOM
A ROOM
B ROOM
M-NET Branch BOX #2
(3-branch type)
M1
M2
S
Warning:
Never splice the cable, otherwise it may result in a smoke, a
¿
re or communi-
cation failure.
E
Power supply: Single phase 208 /230V, 60 Hz
Note:
1
Connect the lines (B), (C) 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 common cable for the power source
and signal.
Wire diameter
(A) Main power line/
Earth line
(B) M-NETcable Shielding
wire CVVS or CPEVS
(C) Signal line/
Earth line
2.1 mm
2
(AWG14)
1.25 mm
2
(AWG16)
Less Than 200 m [656 ft]
1.25 mm
2
(AWG16)
Less Than 25 m [82 ft]
When using twisted wire for the wiring, the use of round terminal is required.
Notes: 1. Wiring size must comply with the applicable local and national
code.
2. Power supply cords and indoor unit/branch box/outdoor unit con-
necting cords shall not be lighter than polychloroprene sheathed
flexible cord. (Design 60245 IEC 57)
3. Install an earth line longer than power cables.
4. Do not bundle the M-NET cable with the connection cable and
power supply cable.
It may cause erroneous operation.
Fig. 8-9
Supply power separately to branch box and outdoor unit
L1
L1
L2
M1
M2
L1
L2
M1
M2
S
S1
S2
S3
TB3A
S1
S2
S3
L2
Outdoor unit
M-NET Branch BOX #1
(5-branches type)
Indoor unit
S1
S2
S3
TB3B
S1
S2
S3
S1
S2
S3
TB3C
S1
S2
S3
S1
S2
S3
TB3D
S1
S2
S3
S1
S2
S3
TB3E
S1
S2
S3
TB2B
C ROOM
D ROOM
TB5
S1
S2
S3
TB3A
S1
S2
S3
Indoor unit
S1
S2
S3
TB3B
S1
S2
S3
S1
S2
S3
TB3C
S1
S2
S3
C ROOM
TB2B
TB5
L1
L2
M1
M2
S
E
Circuit breaker
* Refer to be installation manual of the outdoor unit
(A)
(A)
(B)
(C)
(C)
(C)
(C)
(C)
(C)
(C)
(C)
A ROOM
B ROOM
E ROOM
A ROOM
B ROOM
M-NET Branch BOX #2
(3-branch type)
Power supply from Outdoor unit
L1
L2
M1
M2
S
S1
S2
S3
TB3A
S1
S2
S3
M-NET Branch BOX
(5-branches type)
Indoor unit
S1
S2
S3
TB3B
S1
S2
S3
TB3C
S1
S2
S3
S1
S2
S3
TB3D
S1
S2
S3
TB3E
S1
S2
S3
TB2B
B ROOM
C ROOM
TB5
A ROOM
Fig. 8-10
• Recommended Connection Method
When connecting one indoor unit to the branch box, connect it to TB3A. When connecting
2 indoor units, connect them to TB3A and TB3B. When connecting 3 indoor units, connect
them to TB3A, TB3B, and TB3C. Connect indoor units in the order of A
ĺ
B
ĺ
C
ĺ
D
ĺ
E.
8.2. External wiring procedure (Fig. 8-9, Fig 8-10)
