Publicité
Les langues disponibles
Les langues disponibles
8. Electrical work
Wiring Specifications
(A) Main power line/
(B) M-NETcable
Earth line
Shielded wire
Use UL wire rated 300 V
Use UL wires rated 300 V
1.25 mm
or more
Less than 200 m [656 ft]
2.1 mm
2
(AWG14)
Connect the shielded part
of the shielded wire to the
S terminal on TB5.
A
208/230V
Fig. 8-10
Warning:
In case of A-control wiring, there is high voltage potential on the S3 terminal caused by electrical circuit design that has no electrical insulation between power
line and communication signal line. Therefore, please turn off the main power supply when servicing. And do not touch the S1, S2, S3 terminals when the power
is energized. If an isolator should be used, use the 2 pole type between the outdoor unit and the branch box, and use the 3 pole type between the branch box
and the indoor unit.
* Power supply from outdoor unit
L1
Power supply
Isolator (Switch)
L2
* Supply power separately to branch box and outdoor unit
L1
Power supply
L2
Caution:
After using the isolator, be sure to turn off and on the main power supply to reset the system. Otherwise, the outdoor unit may not be able to detect the
branch box(es) or indoor units.
(C) Signal line/
Earth line
Use UL wires rated 300 V
2
(AWG16)
or more
2
1.25 mm
(AWG16)
Less than 25 m [82 ft]
B
D
L1 L2
M1
M2
S
C
TB2B
TB5
L1
L1
Outdoor unit
L2
L2
L1
L1
Isolator (Switch)
Branch box
L2
L2
Note:
1
Wiring size must comply with the applicable local and national code.
Power supply cords and indoor unit/branch box/outdoor unit connecting
2
cords shall not be lighter than polychloroprene sheathed flexible cord.
(Design 60245 IEC 57)
3
Use copper supply wires.
Install an earth line longer than the power cables.
4
5
Connect the wiring in accordance with the terminal block names to ensure
correct polarity.
Indoor unit and branch box connecting wires(C) have polarities. Make sure
6
to match the terminal number (S1, S2, S3) for correct wirings.
As for lines (C), S1 and S2 are for connecting the power source.
S2 and S3 are for signals. S2 is a common cable for the power source and
signal.
S1
Assign S1 and S3 to the cores placed diagonally.
S3
7
When using twisted wire for the wiring, the use of a round terminal is
required. Take care when using strand wires, because fraying wires may
cause the wiring to short out.
Do not bundle the M-NET cable with the connection cable and power sup-
8
ply cable. It may cause erroneous operation.
Recommended connection methods:
9
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.
Power supply wiring (Supply power separately to branch box and
outdoor unit)
• 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
Warning:
Never splice the cable, otherwise it may result in a smoke, a fire or communi-
cation failure.
2 pole isolator
(Switch)
L1
B1
Branch box
B2
L2
3 pole isolator
(Switch)
S1
S1
S2
"A-control
S2
Indoor unit"
S3
S3
3 pole isolator
(Switch)
S1
S1
S2
"A-control
S2
Indoor unit"
S3
S3
en
12
Publicité
