Mitsubishi Electric BRANCH BOX PAC-MK52BCB Manuel D'installation page 11

8. Electrical work
A B D
220/230/240 V
L N
C
TB2B
Fig. 8-10
D
L N
M1 M2 M1 M2
E
S S 1 2
TB5 TB2 TB5 TB15
Note:
1
Connect 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
(B) M-NETcable
(A) Main power line/
shielding wire CVVS,
Earth line
CPEVS or MVVS
2-core 1.25 mm
3-core 2.5 mm
2
Less than 200 m
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
Reactor BOX (Optional parts)
When the product is used for a purpose other than as professional equip-
ment, the Reactor BOX may be necessary.
Power supply from
Outdoor unit
1-phase power supply
3-phase power supply
9
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.
Power supply wiring (Supply power separately to branch box
and outdoor unit)
• Install an earth line longer than other cables.
• Power supply cords of appliance shall not be lighter than design 245IEC57 or
227IEC57, 245 IEC 53 or 227 IEC 53.
• A switch with at least 3 mm, 1/8 inch contact separation in each pole shall be
provided by the air conditioner installation.
[Fig. 8-10]
A
Ground-fault interrupter
B
Local switch/Wiring breaker
C
Branch Box
D
Pull box
E
M-NET CONTROL INDOOR UNIT
Warning:
Never splice the cable, otherwise it may result in a smoke, a fi re or communi-
cation failure.
(C) Signal line/
Earth line
4-core 1.5 mm
2
Less than 25 m
Branch box power supply method
Separate power supply
outdoor unit
Unnecessary Necessary
Necessary Necessary
2
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