Mitsubishi Electric PAC-MKA51BC Manuel D'installation page 10

8. Electrical work
Supply power separately to branch box and outdoor unit
Circuit breaker
~
Outdoor unit
Circuit breaker
L1
~
L1
L2
L2
M1
M2
10
M-NET Branch BOX #1
(5-branches type)
Indoor unit
(C)
(A)
TB3A
TB2B
S1
S1
L1
indoor
S2
S2
unit A
L2
S3
S3
(C)
TB3B
S1 S1
TB5
indoor
S2 S2
M1
unit B
S3 S3
M2
S
(C)
TB3C
S1 S1
(B)
indoor
S2 S2
unit C
S3
S3
(C)
TB3D
S1 S1
indoor
S2 S2
unit D
S3 S3
(C)
TB3E
S1 S1
indoor
S2 S2
unit E
S3
S3
(A)
(C)
TB3A
TB2B
S1
S1
L1
indoor
S2
S2
L2 unit A
S3 S3
(C)
TB3B
S1
TB5 S1
indoor
S2 S2
M1
unit B
S3 S3
M2
S
(C)
TB3C
S1
S1
indoor
S2
S2
unit C
S3
S3
Indoor unit
M-NET Branch BOX #2
(3-branch type)
8.2. External wiring procedure (Fig. 8-9)
Power supply from Outdoor unit
* Refer to be installation manual of the outdoor unit
Outdoor unit
Circuit breaker
L1
~
L1
L2
L2
M1
M2
Fig. 8-9
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.
(A) Main power line/ (B) M-NETcable shielding
Earth line wire CVVS or CPEVS
2
2.1 mm (AWG14)
Less than 200 m [656 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.
Warning:
Never splice the cable, otherwise it may result in a smoke, a re or communi-
cation failure.
M-NET Branch BOX #1
(5-branches type)
Indoor unit
(C)
(A)
TB3A
TB2B
S1
L1
S2
L2
S3
(C)
TB3B
S1
TB5
S2
M1
S3
M2
S
(C)
TB3C
S1
(B)
S2
S3
(C)
TB3D
S1
S2
S3
(C)
TB3E
S1
S2
S3
(A)
(C)
TB3A
TB2B
S1
L1
S2
L2
S3
(C)
TB3B
TB5 S1
S2
M1
S3
M2
S
(C)
TB3C
S1
S2
S3
Indoor unit
M-NET Branch BOX #2
(3-branch type)
Wire diameter
(C) Signal line/
Earth line
1.25 mm 2 (AWG16) 1.25 mm 2 (AWG16)
Less than 25 m [82 ft]
S1
indoor
S2
unit A
S3
S1
indoor
S2
unit B
S3
S1
indoor
S2
unit C
S3
S1
indoor
S2
unit D
S3
S1
indoor
S2
unit E
S3
S1
indoor
S2
unit A
S3
S1
indoor
S2
unit B
S3
S1
indoor
S2
unit C
S3