8. Electrical work
Warning:
Never splice the cable, otherwise it may result in a smoke, a fire or communi
-
cation failure.
Note:
1
Connect the wiring 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]
3
When using twisted wire for the wiring, the use of round terminal is re-
quired.
4
Wiring size must comply with the applicable local and national code.
5
Power supply cords and indoor unit/branch box/outdoor unit connecting
cords shall not be lighter than polychloroprene sheathed flexible cord.
(Design 60245 IEC 57)
6
Install an earth line longer than power cables.
7
Do not bundle the M-NET cable with the connection cable and power sup-
ply cable. It may cause erroneous operation.
8
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. Con-
nect indoor units in the order of A→B→C→D→E.
Fig. 8-9
Supply power separately to branch box and outdoor unit
Power supply from Outdoor unit
* Refer to be installation manual of the outdoor unit
8.2. External wiring procedure (Fig. 8-9)
(C)
S1
S1
S2
S2
S3
S3
TB3A
(C)
S1
S1
S2
S2
S3
S3
TB3A
(C)
S1
S1
S2
S2
S3
S3
TB3B
(C)
S1
S1
S2
S2
S3
S3
TB3C
(C)
S1
S1
S2
S2
S3
S3
TB3B
(C)
S1
S1
S2
S2
S3
S3
TB3C
(C)
S1
S1
S2
S2
S3
S3
TB3D
(C)
S1
S1
S2
S2
S3
S3
TB3E
L1
L2
(A)
TB2B
B1
B2
M1
M1
M2
M2
S
TB5
(B)
M1
M2
S
TB5
L1
L2
(A)
TB2B
L2
L1
~
~
(B)
GR
Circuit breaker
Outdoor unit
Indoor unit
Indoor
unit A
Pull box
Indoor
unit A
Indoor
unit B
Indoor
unit B
Indoor
unit C
Indoor
unit C
Indoor
unit D
Indoor
unit E
M-NET Branch BOX #1
(5-branches type)
Circuit breaker
Indoor unit
M-NET Branch BOX #2
(3-branches type)
Pull box
(C)
TB3A
S1
S1
S2
S2
S3
S3
(C)
TB3B
S1
S1
S2
S2
S3
S3
(C)
TB3C
S1
S1
S2
S2
S3
S3
(C)
TB3D
S1
S1
S2
S2
S3
S3
(C)
TB3E
S1
S1
S2
S2
S3
S3
(C)
TB3A
S1
S1
S2
S2
S3
S3
(C)
TB3B
S1
S1
S2
S2
S3
S3
(C)
TB3C
S1
S1
S2
S2
S3
S3
M1
M2
S
TB5
L1
L2
TB2B
B1
L1
B2
L2
TB2B
S
M1
M1
M2
M2
TB5
(A)
(B)
(B)
(A)
~
L1
L2
GR
Outdoor unit
Indoor
unit A
Indoor
unit A
Indoor
unit B
Indoor
unit B
Indoor
unit C
Indoor
unit C
Indoor
unit D
Indoor
unit E
M-NET Branch BOX #1
(5-branches type)
Circuit breaker
M-NET Branch BOX #2
(3-branches type)
Indoor unit
Indoor unit
en
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