Mitsubishi Electric PAC-MK50BC Manual De Instalación página 10

8. Electrical work
Supply power separately to branch box and outdoor unit
Circuit breaker
E
Outdoor unit
Circuit breaker
L
E B1
N
B2
M1
M2
M-NET Branch BOX
(5-branches type)
TB3A
TB2B
S1
L
S2
N
S3
TB3B
S1
TB5
S2
M1
S3
M2
S
TB3C
S1
S2
S3
TB3D
S1
S2
S3
TB3E
S1
S2
S3
10
M-NET Branch BOX #1
(5-branches type)
Indoor unit
(C)
(A)
TB3A
TB2B
S1
S1
L
S2 A ROOM
S2
N
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
L
S2
S2
N
S3 S3
(C)
TB3B
S1
TB5 S1
S2
M1 S2
S3 S3
M2
S
(C)
TB3C
S1
S1
C ROOM
S2
S2
S3
S3
Indoor unit
M-NET Branch BOX #2
(3-branch type)
Fig. 8-8
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
 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.
Fig. 8-9
8.2. External wiring procedure (Fig. 8-8, Fig 8-9)
Power supply from Outdoor unit
Outdoor unit
Circuit breaker
* Refer to be installation manual of the outdoor unit
L
E
N
A ROOM
B ROOM
E
Power supply: Single phase 0/30/40 V 50 Hz, 0 V 60 Hz
Note:
Connect the lines (B), (C) in accordance with the terminal block names to
1
ensure correct polarity.
As for lines (C), S1 and S2 are for connecting the power source.
2
And S2 and S3 are for signals. S2 is common cable for the power source
and signal.
(A) Main power line/
Earth line
3-core .5 mm
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 fire or communi-
cation failure.
M-NET Branch BOX #1
(5-branches type)
(A)
TB2B
B1 L
B2 N
TB5
M1
M1
M2 M2
S
(B)
(A)
TB2B
L
N
TB5
M1
M2
S
M-NET Branch BOX #2
(3-branch type)
Wire diameter
(B) M-NETcable Shielding
wire CVVS, CPEVS or MVVS
-core 1.5 mm 

Less Than 00 m
Indoor unit
(C)
TB3A
S1
S1
S2 A ROOM
S2
S3
S3
(C)
TB3B
S1
S1
B ROOM
S2 S2
S3 S3
(C)
TB3C
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
(C)
TB3A
S1
S1
S2
A ROOM
S2
S3 S3
(C)
TB3B
S1 S1
B ROOM
S2
S2
S3 S3
(C)
TB3C
S1
S1
C ROOM
S2
S2
S3
S3
Indoor unit
(C) Signail line/
Earth line
4-core 1.5 mm 
Less Than 5 m