En-8
CAUTION
Earth (Ground) the unit.
Do not connect the earth (ground) cable to a gas pipe, water pipe, lightning rod, or a
telephone earth (ground) cable.
Improper earthing (grounding) may cause electric shock.
Do not connect power supply cables to the transmission or remote controller terminals,
as this will damage the product.
Never bundle the power supply cable and transmission cable, remote controller cable
together.
Separate these cable by 2 in. (50 mm) or more.
Bundling these cables together will cause miss operation or breakdown.
When handling PCB, static electricity charged in the body may cause malfunction of
the PCB. Follow the cautions below:
• Establish an earth (ground) for the indoor and outdoor units and peripheral
devices.
• Cut power (breaker) off.
• Touch metal part of the indoor unit for more than 10 seconds to discharge static
electricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.
]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)
ABUA12TLAV
0.40 A
15 A
ABUA14TLAV
0.43 A
ABUA18TLAV
0.71 A
ABUA24TLAV
0.93 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. Cable speci
fi
cations
Follow the speci
fi
cations below for the power supply, transmission and remote controller
cable.
Recommended
cable size
Cable type
Remark
Transmission cable
22 AWG
(0.33 mm²)
LONWORKS
compatible cable
22 AWG LEVEL 4
(NEMA) non-polar
2 core, twisted pair
solid core diameter
0.026 in. (0.65 mm)
Remote controller cable
(2-wire type)
22 AWG
(0.33 mm²) to 16
AWG (1.25mm²)
Sheathed
PVC cable
Non polar 2 core
Remote controller cable
(3-wire type)
22 AWG
(0.33 mm²)
Sheathed
PVC cable
Polar 3 core
]1
6.2. Wiring method
EXAMPLE
Outdoor unit or RB unit *1
Transmission
Transmission
Power supply
Breaker2
Breaker2
Breaker2
Breaker1
Breaker1
Breaker1
Power supply
Remote controller
(Master)
Remote controller
(Slave)
Remote controller
Indoor unit
Remote
control
*2
*2
*2
Indoor unit
Indoor unit
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
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.
Indoor unit
Power supply
Pull box
Pull box
Breaker2
Breaker1
Power supply
Power supply
Power supply
: Disconnect switch
Indoor unit
Indoor unit
(Crossover wiring of power supply)
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.
3-1/8 in.
(80mm)
3-1/8 in.
(80mm)
Earth
(Ground)
wire
Conduit
connector
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.
Loop
Screw with
special washer
Screw with
special washer
Cable end (Loop)
Cable end (Loop)
Cable
Cable
Terminal block
Strip 1 in.
(25 mm)
9367701124-03_IM.indb Sec1:8
9367701124-03_IM.indb Sec1:8
2013-10-25 13:00:43
2013-10-25 13:00:43
