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Pay attention to the next points for wiring of shielded wires.
(1) Ground wire connection
The shielded wires of M-NET transmission should be
connected with the ground wire at any only one place
of the unit to be connected.
Bad example (Multiple ground of shielded wire)
Power supply
Centralized
controller
unit
M-NET transmit wire
Good example (One spot ground of shielded wire)
Centralized
Power supply
controller
unit
M-NET transmit wire
(*1) Refer to the appendix List of Models to check the applicable models.
(*2) In case that the outdoor unit is grounded, connect the ground wire supplied as accessory to the S terminal (secondary)
of M-NET terminal block and M-NET ground terminal inside of electric box with using screws supplied.
Note: If the shield and earth are grounded in two or more locations, electrical circuit is generated through them, and a
potential difference is created because of the impedance difference between or among the ground locations.
This may cause noise in the shield. Ground at only one point, then no circuit is created and no noise gets in.
(2) Length of M-NET transmission line
The shielded wires of M-NET transmission should be
used below the maximum line length.
L1
Centralized
controller
(3) Using dual set point
1. To activate dual set point, make sure that all units and controllers in one group have dual set point function.
2. To change the temperature display setting of existing group from single to dual set point, make sure to restart the
whole system related.
3. When ME remote controller is included in same group in the case of 2, make sure to initialize* ME remote controller
before use.
(*Refer to the ME remote controller installation manual. <Service Menu.>)
2
Attention for M-NET connection
Outdoor
Outdoor
unit (*1)
unit (*1)
NO
NO
NO
Outdoor
Outdoor
unit (*1)
unit (*1)
OK (*2)
M-NET
L2
Outdoor
Power supply
unit
L3
Mr. SLIM
Outdoor
M-NET
Adapter
CAUTION
• It can cause the transmission error due to noise.
Outdoor unit digital LED display reads "Ed" "A7" error.
Centralized controller reads "0403" "6607" error.
Good example (One spot ground of shielded wire)
Centralized
controller
M-NET transmit wire
(*2)
M-NET
terminal block
CAUTION
• It can cause the transmission error.
Outdoor unit digital LED display reads "Ed" "A7" error.
Centralized controller reads "0403" "6607" error.
unit
Indoor unit
ME
controller
unit
Indoor unit
MA
controller
Power supply
Outdoor
unit
unit (*1)
OK
Ground wire
(accessory)
Transmit
Shielded
wire
wire
Indoor unit
Indoor unit
Indoor unit
M-NET transmission line
(Centralized control line)
M-NET transmission line
(Indoor control line)
A transmission line
MA remote controller line
Maximum power feeding length for
the centralized control line:
[ 200 m (656 ft)
L1
L2 + L3 [ 200 m (656 ft)
Outdoor
unit (*1)
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