Connecting The M-Net Transmission Lines - Mitsubishi Electric BAC-HD150 Installation Manual

4-3. Connecting the M-NET transmission lines

CAUTION • In an air conditioner system has more than 1 Outdoor units, System controller receiving transmission power
through TB7 on one of the Outdoor unit would have a risk that the connected Outdoor units failure would stop
power supply to System controller, and disrupt the whole system.
(1) Supplying power to the M-NET transmission line from the BAC-HD150
Connect the M-NET transmission lines and the power jumper as shown in the figure below.
BM ADAPTER
(BAC-HD150)
TB3
A B S
M-NET
transmission line
(non-polarized)
Cable
clamps
(2) To not supply power to the M-NET transmission line from the BAC-HD150
Connect the M-NET transmission lines and the power jumper as shown in the figure below.
BM ADAPTER
(BAC-HD150)
TB3
A B S
M-NET
transmission line
(non-polarized)
Cable
clamps
TB3
CN41
OFF
CN40 CN40
ON ON
Shield
Power supply unit (PAC-SC51KUA...etc)
TB3
CN41
OFF
CN40 CN40
ON ON
Shield
M-NET
CAUTION • Connect the shield to the S terminal of TB3.
Insulate the cables with vinyl tape, except the part
that connects to the ring terminal.
• Connect the power jumper of BAC-HD150 to
CN40 (supplies power).
Connect the power jumper of the outdoor unit
to CN41 (does not supply power).
• Use the type of transmission lines specified, and
connect them to the appropriate terminals. Secure
the cables to keep undue force from being applied.
Improper connections or failure to properly secure
cables may result in overheating and fire.
M-NET
CAUTION • Connect the shield to the S terminal of TB3.
Insulate the cables with vinyl tape, except the part
that connects to the ring terminal.
• Connect the power jumper of BAC-HD150 to
CN41 (does not supply power at factory setting).
Connect the power jumper of the outdoor unit
to CN41 (does not supply power).
• Use the type of transmission lines specified, and
connect them to the appropriate terminals. Secure
the cables to keep undue force from being applied.
Improper connections or failure to properly secure
cables may result in overheating and fire.
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Outdoor unit
TB7
CN40 CN41 CN41 CN41
Outdoor unit
TB7
CN40 CN40 CN40 CN41 CN41 CN41