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6.2. Wiring method
Example
Outdoor unit or RB unit *1
Transmission
Indoor unit
Remote
Transmission
control
Power supply
*2
*3
Breaker
Power supply
Remote controller
(Master)
*1: When connecting to the Heat Recovery System, refer to the installation manual of
the RB unit.
*2: Earth (Ground) the remote controller if it has a earth (ground) cable.
*3: When connecting the 2-wire type remote controller, Y3 is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply
Pull box
Breaker
Power supply
* Earth (Ground) the remote controller if it has an earth (ground) wire.
Connect the earth (ground) wire of the remote controller to the earth (ground) terminal of
transmission.
6.3. Unit wiring
Before attaching the cable to terminal block.
6.3.1. Power supply cable
Adjust the length of power supply cable to avoid excessive tension with referring fi gure
below.
Earth (Ground)
cable
A. For solid core wiring
(1) To connect the electrical terminal, follow the below diagram and connect after
looping it around the end of the cable.
(2) Use the specifi ed cables, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(3) Use an appropriate screwdriver to tighten the terminal screws.
Do not use a screwdriver that is too small, otherwise, the screw heads may be
damaged and prevent the screws from being properly tightened.
(4) Do not tighten the terminal screws too much, otherwise, the screws may break.
(5) See the table for the terminal screw tightening torques.
(6) Please do not fi x 2 power supply cables with 1 screw.
Strip 25 mm
Screw with
special washer
Cable
Cable end (Loop)
Terminal block
En-9
Indoor unit
*2
*2
*3
Breaker
Breaker
Remote controller
Remote controller
(Slave)
Indoor unit
Indoor unit
Power supply
Power supply
Pull box
25 mm
30 mm
Loop
Screw with
special washer
Cable end (Loop)
Cable
When using solid core cables, do not use the ring terminal. If you use the solid core
cables with the ring terminal, the ring terminal's pressure bonding may malfunction and
cause the cables to abnormally heat up.
B. For strand wiring
(1) Use ring terminals with insulating sleeves as shown in the fi gure below to connect to
the terminal block.
(2) Securely clamp the ring terminals to the cables using an
appropriate tool so that the cables do not come loose.
Indoor unit
(3) Use the specifi ed cables, connect them securely, and fasten them so that there is no
stress placed on the terminals.
(4) Use an appropriate screwdriver to tighten the terminal screws.
Do not use a screwdriver that is too small, otherwise, the screw heads may be
*3
damaged and prevent the screws from being properly tightened.
(5) Do not tighten the terminal screws too much, otherwise, the screws may break.
(6) See the table for the terminal screw tightening torques.
(7) Please do not fi x 2 power supply cables with 1 screw.
Strip 10 mm
Cable
Use ring terminals and tighten the terminal screws to the specifi ed torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
M4 screw
(Power supply /L, N, GND)
6.3.2. Transmission and Remote controller cable
Transmission cable
Shielded cable (no fi lm)
Remote controller cable
For 3-wire type
• Connect remote controller and transmission cables as shown in Fig. A.
Fig. A
GOOD
Tighten the terminal screws to the specifi ed torques, otherwise, abnormal overheating
may be produced and possibly cause heavy damage inside the unit.
WARNING
Ring terminal
Screw with
special washer
Ring terminal
Terminal block
WARNING
Tightening torque
1.2 to 1.8 N·m
(12 to 18 kgf·cm)
25 mm
35 mm
For 2-wire type
25 mm
PROHIBITED
Different diameter
Connect to 1 side
WARNING
Sleeve
Screw with
special washer
Ring terminal
Cable
25 mm
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