Mitsubishi Electric PAC-MKA50BC Installation Manual page 10

8. Electrical work
Supply power separately to branch box and outdoor unit
Circuit breaker
E
Outdoor unit
Circuit breaker
L1
E L1
L2
L2
M1
M2
Fig. 8-9
M-NET Branch BOX
(5-branches type)
TB3A
TB2B
S1
L1
S2
L2
S3
TB3B
S1
TB5
S2
M1
S3
M2
S
TB3C
S1
S2
S3
TB3D
S1
S2
S3
TB3E
S1
S2
S3
Fig. 8-10
10
M-NET Branch BOX #1
(5-branches type)
Indoor unit
(C)
(A)
TB3A
TB2B
S1
S1
L1
S2 A ROOM
S2
L2
S3
S3
(C)
TB3B
S1
S1
TB5
B ROOM
S2 S2
M1
S3 S3
M2
S
(C)
TB3C
(B) S1
S1
C ROOM
S2 S2
S3
S3
(C)
TB3D
S1 S1
D ROOM
S2 S2
S3 S3
(C)
TB3E
S1 S1
S2 S2 E ROOM
S3
S3
(A)
(C)
TB3A
TB2B
S1 S1
L1
S2 A ROOM
S2
L2
S3 S3
(C)
TB3B
S1
TB5 S1
B ROOM
S2 S2
M1
S3 S3
M2
S
(C)
TB3C
S1
S1
C ROOM
S2
S2
S3
S3
Indoor unit
M-NET Branch BOX #2
(3-branch type)
Indoor unit
S1
S2 A ROOM
S3
S1
B ROOM
S2
S3
S1
S2 C ROOM
S3
• 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 B C D E.
8.2. External wiring procedure (Fig. 8-9, Fig 8-10)
Power supply from Outdoor unit
Outdoor unit
Circuit breaker
* Refer to be installation manual of the outdoor unit
L1
E L1
L2
L2
M1
M2
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/ (B) M-NETcable Shielding
Earth line wire CVVS or CPEVS
1.25 mm
2.1 mm 2 (AWG14)
Less Than 200 m [656 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.
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
S1
L1
S2 A ROOM
S2
L2
S3
S3
(C)
TB3B
S1 S1
TB5
B ROOM
S2 S2
M1
S3 S3
M2
S
(C)
TB3C
(B) S1
S1
C ROOM
S2
S2
S3 S3
(C)
TB3D
S1 S1
D ROOM
S2 S2
S3
S3
(C)
TB3E
S1 S1
E ROOM
S2 S2
S3 S3
(A)
(C)
TB3A
TB2B
S1
S1
L1
S2
A ROOM
S2
L2
S3 S3
(C)
TB3B
TB5 S1 S1
B ROOM
S2 S2
M1
S3 S3
M2
S
(C)
TB3C
S1
S1
C ROOM
S2
S2
S3
S3
Indoor unit
M-NET Branch BOX #2
(3-branch type)
(C) Signal line/
Earth line
2 (AWG16) 1.25 mm 2 (AWG16)
Less Than 25 m [82 ft]