En-8
6.1.1. Cable speci
fi
cations
Follow the speci
fi
cations below for the power supply, transmission and remote controller
cable.
Recommended
cable size (mm
2
)
Cable type
Remark
Power supply
cable
2.5
Type 60245 IEC57 or
equivalent
2 Cable + earth (ground)
Transmission
cable
0.33
LONWORKS compat-
ible cable
22 AWG LEVEL 4 (NEMA)
non-polar 2 core, twisted
pair solid core diameter
0.65 mm
Remote control-
ler cable
(2-wire type)
0.33 to 1.25
Sheathed PVC cable*
Non-polar 2 core, twisted
pair
*: Use shielded cable in accordance with local rules for remote controller cable.
6.2. Wiring method
Example
*2
*2
*2
*3
*3
*3
Outdoor unit or RB unit *1
Transmission
Transmission
Indoor unit
Remote controller
(Master)
Power supply
Indoor unit
Indoor unit
Power supply
Remote
control
Breaker
Breaker
Breaker
Remote controller
(Slave)
Remote controller
*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: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Pull box
Pull box
Power supply
Power supply
Power supply
Indoor unit
Indoor unit
Breaker
Power supply
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
25 mm
35 mm
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 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
Loop
Screw with
special washer
Screw with
special washer
Cable end
(Loop)
Cable
Cable
Terminal block
Cable end (Loop)
WARNING
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.
(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 screw-
driver that is too small, otherwise, the screw heads may be 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.
Sleeve
Strip 10 mm
Screw with
special washer
Screw with special
washer
Ring terminal
Cable
Terminal block
Cable
Ring terminal
Ring
terminal
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.
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 and Remote controller cable
Transmission cable
Remote controller cable
Shield cable
(no film)
25 mm
35 mm
25 mm
• Connect remote controller and transmission cables as shown in Fig. B.
• When the 2 cables are attached.
Fig. B
GOOD
PROHIBITED
Different diameter
Connect to 1 side
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9365748329-01_IM.indb 8
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2/21/2019 1:51:40 PM
