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(2) In the following cases, Signal Amplifier is required.
When the total length of the transmission line exceeded 500 m
(A + C + D + E + F + G + H + J + K + N ≥ 500 m)
When the total number of units is over 64.
NS 1
K
J
(a)
C
Terminal resistor
NS 3
H
* P + C + D + E + J + K + N ≤ 500 m, Q + F + G + H ≤ 500 m
The transmission cable connects indoor units belonging to the same RB group. The trans-
mission cable cannot be used to connect indoor units belonging to different RB groups.
Transmission line
Refrigerant pipe
RB group 1
RB group 2
GOOD
Transmission line
Refrigerant pipe
RB unit
(multi type)
RB
RB
RB
group 1
group 2
group 3,4
GOOD
• If there are more than 321 units (*1) within
the network system, a signal amplifier
(with the filter mode: on) must be installed
between the master outdoor units. See
the Signal Amplifier Installation Manual
and Design & Technical Manual for more
information.
*1: Unit* means indoor unit, outdoor unit,
Touch Panel Controller and System
Controller, Signal Amplifier, single split
adaptor, Network Convertor etc.
Do not use loop wiring. This may lead to parts damage
and erroneous operation.
6.5.3 Enabling/Disabling automatic address setting
You can enable/disable automatic address setting for the indoor unit, RB unit and the
signal amplifier.
To enable automatic address setting for the indoor unit, connect the indoor unit to outdoor
units under the same refrigerant system.
Example:
Disable Auto-
matic Address
setting
Refrigerant system 1
Refrigerant system 2
En-13
NS 2
N
W
P (a to c)
D
Q (c to b)
(b)
G
F
Signal amplifier
RB group 1
RB group 2
PROHIBITED
RB unit
(multi type)
RB
RB
RB
group 1
group 2
group 3,4
PROHIBITED
Signal amplifier
(Filter mode: on)
Transmission line
Transmission line
Example:
Enable Auto-
matic Address
setting
6.6. Wiring procedure
• Remove the cover of the electrical compartment and follow the terminal plate to connect
the electric cables to the terminal.
• After connecting the cables, secure them with the cable ties.
• Connect the cables without applying excessive tension.
(c)
6.6.1 Cable routing
Secure with a cable tie as shown in the figure below.
Connecting the
power supply
cable
Cable tie
(accessory)
Power supply
cable routing
* Tighten the cable tie firmly so that pulling force does not propagate to the terminal con-
nection even if force of 100 N is applied to the cable.
6.6.2 Connecting cables to the terminals
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
Be sure fill the holes of power supply cable and transmission cable with putty (Locally
purchased).
If small animals such as insects enter the electrical component box, a short circuit may
be caused.
M3 screw
M8 screw
Refrigerant system 1
Refrigerant system 2
Transmission cable routing
WARNING
Tightening torque
0.5 to 0.6 N·m (5 to 6 kgf·cm)
5.0 to 7.0 N·m (50 to 70 kgf·cm)
Transmission line
Transmission line
Connecting the
transmission
cable
Cable guide
Cable clip
Cable tie*
(accessory)
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