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3-2. M-NET transmission line length
• Connect the BAC-HD150 to the transmission line for centralized control (TB7 on the outdoor unit).
• There should only be one power supply source within a single transmission circuit. The factory setting is that power is not
supplied from the BAC-HD150.
• Connect the shield of the M-NET transmission line for centralized control to the S terminal of TB3.
Provide an earth for the indoor-outdoor transmission lines at one single outdoor unit.
• Maximum line distance Maximum 500 m/1,640 ft*
1, 2
• Maximum power supply distance Maximum 200 m/656 ft*
1
(1) Maximum line distance
1
L1 + L2 + 5 + 1 + 2 ( 3)
500 m/1,640 ft
2
L1 + L2 + 5 + 4
500 m/1,640 ft
3
L1 + L3 + 6 + 7 ( 8)
500 m/1,640 ft
4
2 ( 3) + 1 + 5 + L2 + L3 + 6 + 7 ( 8)
500 m/1,640 ft
5
4 + 5 + L2 + L3 + 6 + 7 ( 8)
500 m/1,640 ft
(2) Power supply distance for the indoor-outdoor transmission lines
1
5 + 1 + 2 ( 3)
200 m/656 ft
2
5 + 4
200 m/656 ft
3
6 + 7 ( 8)
200 m/656 ft
(3) Power supply distance for the centralized control transmission lines
1
L1 + L2
200 m/656 ft
2
L1 + L3
200 m/656 ft
Maximum power supply distance is the distance in which a power supply unit (or an outdoor unit designated as a power
supply unit) is capable of supplying power to other units on the receiving end, such as remote controllers and indoor units.
Note
*1 The ME remote controller wiring length ( 3, 8) should be 10 m (32 ft) or less.
The length that exceeds 10 m (32 ft) needs to be included in the maximum distance to the farthest unit (500 m/1,640 ft) and
the maximum power supply distance (200 m/656 ft).
*2 If the ME remote controller wiring length ( 3, 8) is 10 m (32 ft) or less, it does not need to be included in the maximum
distance to the farthest unit.
L1
1
2
3
4
6
7
8
L2
L3
5
BM ADAPTER
(BAC-HD150)
BACnet (LAN)
Sample wiring connection
M-NET
(For centralized control)
Outdoor
unit
Outdoor
unit
Outdoor
unit
Outdoor
unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
Indoor unit
M-NET (For indoor-outdoor transmission line)
ME remote controller
M-NET transmission line
(centralized control)
M-NET transmission line
(indoor-outdoor)
BACnet (LAN)
ME remote controller
CN40
CN41
outdoor unit
* To supply power from the BAC-HD150,
check that the power jumper is
connected to CN41. Refer to section
4-3 for details.
