Mitsubishi Electric PAC-MKA52BC Manuel D'installation page 10

8. Electrical work
Supply power separately to branch box and outdoor unit
Circuit breaker
~
Outdoor unit
Circuit breaker
L1
~
B1
L2
B2
GR
M1
M2
en
9
M-NET Branch BOX #1
(5-branches type)
Indoor unit
(A) TB3A
(C)
TB2B
S1 S1
L1
S2 S2 Indoor
L2
unit A
S3 S3
TB3B
(C)
S1 S1
TB5
Indoor
S2 S2
M1
unit B
S3 S3
M2
S
TB3C
(C)
S1 S1
(B)
Indoor
S2 S2
unit C
S3 S3
TB3D
(C)
S1 S1
S2 S2 Indoor
unit D
S3 S3
TB3E (C)
S1 S1
S2 S2 Indoor
unit E
S3 S3
(A)
TB3A
(C)
TB2B
S1 S1
L1
Indoor
S2 S2
L2
unit A
S3 S3
TB3B
(C)
S1 S1
TB5
M1 S2 S2 Indoor
unit B
M2 S3 S3
S
TB3C
(C)
(B)
S1 S1
S2 S2 Indoor
unit C
S3 S3
Indoor unit
M-NET Branch BOX #2
(3-branches 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
~ B1
L2
B2
GR
M1
M2
Fig. 8-9
Note:
Connect the wiring in accordance with the terminal block names to ensure
1
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
2.1 mm (AWG14)
2
When using twisted wire for the wiring, the use of round terminal is re-
3
quired.
Wiring size must comply with the applicable local and national code.
4
Power supply cords and indoor unit/branch box/outdoor unit connecting
5
cords shall not be lighter than polychloroprene sheathed flexible cord.
(Design 60245 IEC 57)
Install an earth line longer than power cables.
6
Do not bundle the M-NET cable with the connection cable and power sup-
7
ply cable. It may cause erroneous operation.
Recommended Connection Method
8
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 fire or communi-
cation failure.
M-NET Branch BOX #1
(5-branches type)
TB3A
(A)
TB2B
S1
L1
S2
L2
S3
TB3B
S1
TB5
S2
M1
S3
M2
S
TB3C
S1
(B)
S2
S3
TB3D
S1
S2
S3
TB3E
S1
S2
S3
(A)
TB2B TB3A
L1
S1
L2
S2
S3
TB3B
TB5
S1
M1
S2
M2
S3
S
TB3C
(B)
S1
S2
S3
M-NET Branch BOX #2
(3-branches type)
Wire diameter
(B) M-NETcable shielding (C) Signal line/
wire CVVS or CPEVS Earth line
1.25 mm (AWG16) 1.25 mm
2
Less than 200 m [656 ft] Less than 25 m [82 ft]
Indoor unit
(C)
S1
S2
Indoor
unit A
S3
(C)
S1
S2
Indoor
unit B
S3
(C)
S1
S2
Indoor
unit C
S3
(C)
S1
S2
Indoor
unit D
S3
(C)
S1
S2
Indoor
unit E
S3
(C)
S1
S2
Indoor
unit A
S3
(C)
S1
S2
Indoor
unit B
S3
(C)
S1
S2
Indoor
unit C
S3
Indoor unit
(AWG16)
2