En-7
6.2. Wiring method
EXAMPLE
Outdoor unit or RB unit *1
*2
*2
*2
*3
*3
*3
Transmission
Transmission
Power supply
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 an earth (ground) cable.
*3: When connecting the 2-wire type remote controller, Y3 is not used.
Remote controller
(Slave)
Remote controller
Breaker
Breaker
Remote
control
Remote
control
Indoor unit
Indoor unit
Indoor unit
(Crossover wiring of power supply)
Indoor unit
Pull box
Pull box
Power supply
Power supply
Power supply
Indoor unit
Indoor unit
Breaker
Power supply
* Earth (Ground) the remote controller if it has an earth (ground) wire.
]1
6.3. Unit wiring
• Before attaching the cable to terminal block.
6.3.1. Power supply cable
25 mm
35 mm
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 speci
fi
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 dam-
aged 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
Screw with
special washer
Cable end (Loop)
Loop
Terminal block
Cable end (Loop)
Cable
Cable
WARNING
When using solid core cables, do not use the attached 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.
(3) Use the speci
fi
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 dam-
aged 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
Ring terminal
Sleeve
Screw with
special washer
Screw with
special washer
Ring terminal
Terminal block
Ring terminal
Cable
Cable
WARNING
Use ring terminals and tighten the terminal screws to the speci
fi
ed torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
Terminal number
Tightening torque
M4 screw (Power supply/L, N, GND)
1.2 to 1.8 N·m (12 to 18 kgf·cm)
6.3.2. Transmission cable
30 mm
35 mm
Shielded cable (no
fi
lm)
• Connect transmission cables as shown in Fig. B.
• When the 2 cables are attached.
Fig. B
GOOD
PROHIBITED
Different diameter
Connect to 1 side
WARNING
Tighten the terminal screws to the speci
fi
ed torques, otherwise, abnormal overheating
may be produced and possibly cause heavy damage inside the unit.
Terminal number
Tightening torque
M3 screw (Transmission/X1, X2)
0.5 to 0.6 N·m (5 to 6 kgf·cm)
CAUTION
To peel the
fi
lm from the lead cable, use a dedicated tool that will not damage the
conductor cable.
When installing a screw on the terminal block, do not cut the cable by overtightening
the screw. On the other hand, an undertightened screw can cause faulty contact, which
will lead to a communication failure.
Remove it with the following sequence in case of the state with the grille.
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