En-7
6.1. Electrical
requirement
• Select the power cable type and size
in accordance with relevant local and
national regulations.
Voltage rating
208/230 V
Operating range
187 to 253 V
• Specifications 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.
Breaker should be installed at every refrigerant system. Do not use a breaker in a different
refrigerant system.
Refer to the table for the breaker specifications 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)
• MCA: Minimum Circuit Ampacity
• MAX. CKT. BKR : Maximum Circuit
Breaker
ASUB18TLAV1
0.53 A
15 A
ASUB24TLAV1
0.65 A
When the power crossover wiring is done, make it so that the total of the MCA of the con-
nected 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. Earth leakage breaker requirements
Breaker capacity
Maximum connect-
able “indoor units”
or “indoor units +
RB units” (*1)
*1: Heat pump type: indoor units,
Heat recovery type: indoor units
and RB units.
*2: If the 100 mA capacity breaker is
not provided, split the quantity of
the indoor units into small groups
of 9 units or less and provide a
breaker with capacity of 30 mA for
each group.
30 mA, 0.1 sec or less
36 or less
100 mA, 0.1 sec or less
37 to 121 (*2)
6.1.1 Cable speci
fi
cations
Cable size
Cable type
Remarks
Transmission
cable
22 AWG
(0.33 mm²)
LEVEL 4 (NEMA) non-polar
2 core, twisted pair solid core
diameter 0.026 in (0.65mm)
LONWORKS ®
compatible cable
Remote con-
troller cable
(2-wire type)
22 AWG to 16 AWG
(0.33 to 1.25 mm²)
Sheathed PVC cable
Non polar 2 core,
twisted pair
18AWG
Thermostat cable 2 core
Use sheathed non
twisted pair cable
Remote con-
troller cable
(3-wire type)
22 AWG
(0.33 mm²)
Sheathed PVC cable
Polar 3 core
6.2. Wiring
method
Example
*2
*2
*2
Outdoor unit or RB unit *1
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Transmission
Transmission
Indoor unit
Remote controller
(Master)
Power supply
Indoor unit
Indoor unit
Power supply
Remote
control
Breaker 2
Breaker 2
Breaker 2
Breaker 1
Breaker 1
Breaker 1
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: When connecting the 2-wire type remote controller, Y3 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 2
Breaker 1
Power supply
: Disconnect switch
6.3. Unit
wiring
• Before attaching the cable to terminal block.
6.3.1. Power supply cable
6-7/8 in (175 mm)
6-1/2 in (165 mm)
Conduit connector
Conduit holder
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 1 in
(25 mm)
Screw with
special washer
Screw with
special washer
Cable end (Loop)
Loop
Terminal block
Cable end (Loop)
Cable
Cable
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