En-7
1
6.1. Electrical requirement
Voltage rating
208 / 230 V
Operating range
187 to 253 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.
• Select the correct cable type and size according to the country or region’s regulations.
• 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
MAX. CKT. BKR (Fuse capacity)
ARUH36TLAV
2.70 A
15 A
ARUH48TLAV
4.83 A
ARUH60TLAV
4.83 A
MCA: Minimum Circuit Ampacity
MAX. CKT. BKR : Maximum Circuit Breaker
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 11 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. Ground Fault Equipment Breaker requirements
Breaker capacity
* Maximum connectable
“indoor units” or “indoor units + RB units”
30 mA, 0.1 sec or less
36 or less **
100 mA, 0.1 sec or less
37 to 90
* Heat pump type: indoor units, Heat recovery type: indoor units and RB units.
** If the total number of units connected to the breaker exceeds 36, either add a 30mA
breaker, or use breakers with a greater capacity.
6.1.1. Transmission and remote controller wiring speci
fi
cations
Follow the speci
fi
cations below for the transmission and remote controller cable.
Cable size
Wire type
Remarks
Transmission cable
22 AWG
(0.33 mm²)
LEVEL 4 (NEMA) non-
polar 2core, twisted
pair solid core diam-
eter 0.026 in. (0.65mm)
LONWORKS ®
compatible cable
Remote controller cable
(2-wire type)
22 AWG to 16 AWG
(0.33 to 1.25 mm²)
Sheathed PVC cable
Non polar 2 core
Remote controller cable
(3-wire type)
22 AWG
(0.33 mm²)
Sheathed PVC cable
Polar 3 core
Twisted pair
]1
6.2. Wiring method
EXAMPLE
Outdoor unit or RB unit *1
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Transmission
Transmission
Power supply
Breaker2
Breaker2
Breaker2
Breaker1
Breaker1
Breaker1
Power supply
Remote controller
(Master)
Breaker shall be located in sight from and readily accessible from all indoor units.
*1: When connecting to the Heat Recovery System, refer to the installation manual of
the RB unit.
*2: When connecting the 2-wire type remote controller, Y3 is not used.
Remote controller
(Slave)
Remote controller
Indoor unit
Remote
control
*2
*2
*2
Indoor unit
Indoor unit
(Crossover wiring of power supply)
Breaker2
Breaker1
Indoor unit
Power supply
Pull box
Pull box
Power supply
: Disconnect switch
Power supply
Power supply
Indoor unit
Indoor unit
Disconnect switch shall be installed between indoor unit and pull box.
]1
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.
Power supply cable
Earth (Ground)
wire
Conduit connector
2-3/8 in. (60mm)
2-3/4 in. (70mm)
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 1 in.
(25 mm)
Screw with
special washer
Terminal block
Cable end (Loop)
Cable end (Loop)
Loop
Screw with
special washer
Cable
Cable
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.
(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.
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9373870135-03_IM.indb Sec1:7
10/24/2013 2:57:14 PM
10/24/2013 2:57:14 PM
