En-11
6.1. Electrical requirement
Voltage rating
230 V
Operating range
198 to 264 V
• Select the power cable type and size in accordance with relevant local and national
regulations.
• Speci
fi
cations for local wiring power cord and branch wiring are in compliance with local
code.
• Max. wire length: Set a length so that the voltage drop is less than 2%. Increase the
wire diameter when the wire length is long.
Refer to the table for the breaker speci
fi
cations of each installation condition. Perform
the power crossover wiring within the range of the same refrigerant system. When the
crossover wiring is done, make a connection for indoor units to satisfy conditions A and B
below.
A. Current breaker requirements
Model
MCA
MFA
ARXD04GALH
0.36 A
20 A
ARXD07GALH
0.38 A
ARXD09GALH
0.42 A
ARXD12GALH
0.46 A
ARXD14GALH
0.74 A
ARXD18GALH
0.66 A
ARXD24GALH
0.94 A
MCA: Minimum Circuit Ampacity
MFA: Main Fuse Ampacity
When the power crossover wiring is done, make it so that the total of the MCA of the
connected RB units and indoor units does not exceed the 15 A. For RB unit MCA, refer to
the RB unit installation manual.
If the capacity of connected RB units and indoor units exceeds the upper limit, either add
breakers or use a breaker with a greater capacity.
B. Earth leakage breaker requirements
Breaker capacity
* Maximum connectable “indoor units” or
“indoor units + RB units”
30 mA, 0.1 sec or less
44 or less **
100 mA, 0.1 sec or less
45 to 128
* Heat pump type: indoor units, Heat recovery type: indoor units and RB units.
** If the total number of units connected to the breaker exceeds 44, either add a 30mA
breaker, or use breakers with a greater capacity.
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
Type60245 IEC57
or equivalent
1ø 50 Hz 198 to 264 V
2 Cable + earth (ground)
Transmission
cable
0.33
LONWORKS
compatible cable
22 AWG LEVEL 4 (NEMA)
non-polar 2 core, twisted pair
solid core diameter 0.65 mm
Remote
controller cable
(2-wire type)
0.33 to 1.25
Sheathed PVC
cable*
Non polar 2 core
Remote
controller cable
(3-wire type)
0.33
Sheathed PVC
cable*
Polar 3 core
*: Use shielded cable in accordance with local rules for remote controller cable.
6.2. Wiring method
EXAMPLE
Outdoor unit or RB unit *1
Transmission
Transmission
Power supply
Breaker
Power supply
Remote controller
(Master)
Remote controller
(Slave)
Remote controller
Breaker
Breaker
Indoor unit
Remote
control
*2
*2
*2
*3
*3
*3
Indoor unit
Indoor unit
*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.
Pull box
(Crossover wiring of power supply)
Indoor unit
Power supply
Pull box
Power supply
Breaker
Power supply
Power supply
Indoor unit
Indoor unit
* 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.
20 mm
30 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
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 screwdriver that is too small, otherwise, the screw heads may be
damaged and prevent the screws from being properly tightened.
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