M-Net Transmission Line Length - Mitsubishi Electric GB-50ADA-A Installation Instructions Manual

5-2. M-NET transmission line length

• Connect the GB-50ADA to the transmission line for centralized control (TB7 on the outdoor unit).
• There should only be one power supply source within a single M-NET transmission circuit. The factory setting is to supply
power from GB-50ADA.
• Provide an earth for the indoor-outdoor transmission lines at one single outdoor unit.
• Maximum line distance
• Maximum power supply distance
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.
Wiring example
Centralized
LAN
Controller
(GB-50ADA)
M-NET transmission line
(Transmission line for
centralized control)
M-NET transmission line
(indoor-outdoor
transmission line)
LAN
(1) Maximum line distance
1 L1 + L2 + 5 + 1 + 2 ( 3)
2 L1 + L2 + 5 + 4
3 L1 + L3 + 6 + 7 ( 8)
4
2 ( 3) + 1 + 5 + L2 + L3 + 6 + 7 ( 8)
5
4 + 5 + L2 + L3 + 6 + 7 ( 8)
(2) Power supply distance for the indoor-outdoor transmission lines
1
5 + 1 + 2 ( 3)
2
5 + 4
3
6 + 7 ( 8)
(3) Power supply distance for the centralized control transmission lines
1 L1 + L2
2 L1 + L3
CAUTION
*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 (1640 ft)) and
in 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.
*1
500 m (1640 ft)
*1
200 m (656 ft)
M-NET
(For centralized control)
L1
Outdoor
unit
Outdoor
unit
L3 L2
Outdoor
unit
Outdoor
unit
200m (656 ft)
200m (656 ft)
200m (656 ft)
200m (656 ft)
200m (656 ft)
M-NET (For indoor-outdoor transmission line)
1
Indoor unit
3
5
ME remote controller
Indoor unit
6
Indoor unit
8
ME remote controller
500m (1640 ft)
500m (1640 ft)
500m (1640 ft)
500m (1640 ft)
500m (1640 ft)
- 14 -
2
Indoor unit Indoor unit
4
Indoor unit Indoor unit
7
Indoor unit Indoor unit
* Connect the power jumper of the
outdoor unit to CN41 (does not supply
power).
CN40 CN41
ON OFF
outdoor unit