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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
MAX. CKT. BKR
Model
MCA
(Fuse capacity)
8.13 A
ARUH72TLAV2
15 A
9.40 A
ARUH96TLAV2
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. Ground Fault Equipment Breaker requirements
Breaker capacity
30 mA, 0.1 sec or less
100 mA, 0.1 sec or less
*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 12 units or less and provide a breaker with capacity of 30 mA for each
group.
When connecting different models on the above listed breaker in conjunction with the
ARUH72TLAV2/ARUH96TLAV2, you might be able to connect more than 12 units. To
determine the maximum amount of indoor units when using different models, reference
each units Design and Technical Manual to calculate the total amount of units that can be
connected on a given breaker.
6.1.1. Transmission and remote controller wiring specifi cations
• Follow the specifications below for the transmission and remote controller cable.
Cable size
Use
(AWG)
LEVEL 4 (NEMA) non-polar 2 core,
Transmission
22
twisted pair solid core diameter
cable
0.026 in (0.65 mm)
22 to 16
Sheathed PVC cable
Remote con-
troller cable
(2-wire type)
18
Thermostat cable 2 core
6.2. Wiring method
Example
Outdoor unit or RB unit *1
Transmission
Indoor unit
Remote
Transmission
control
Power supply
Breaker 2
Breaker 1
*2
Remote controller
(Master)
Power supply
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply
Pull box
Breaker2
Breaker1
Power supply
Disconnect switch shall be installed between indoor unit and pull box.
MCA: Minimum Circuit Ampacity
MAX. CKT. BKR: Maximum Circuit
Breaker
Maximum connectable "indoor units" or
"indoor units + RB units" (*1)
12 or less
13 to 40 (*2)
Cable type
Remarks
LONWORKS®
compatible cable
Non polar 2 core,
twisted pair
Use sheathed non
twisted pair cable
Breaker 1: Ground Fault Equipment
Breaker (GFEB)
Breaker 2: Maximum Circuit Breaker
(MAX. CKT. BKR)
Indoor unit
Indoor unit
Breaker 2
Breaker 2
Breaker 1
Breaker 1
*2
*2
Remote controller
(Slave)
controller
Indoor unit
Indoor unit
Power supply
Power supply
Pull box
: Disconnect switch
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 figure
below.
Earth (Ground)
wire
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 specified 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 screw-
driver 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 fix 2 power supply cables with 1 screw.
Strip 1 in
(25 mm)
Cable
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 figure 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 specified 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 fix 2 power supply cables with 1 screw.
Strip 3/8 in
(10 mm)
Remote
Cable
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
M4 screw
(Power supply/L1, L2 (N), GND)
Conduit connector
4-3/4 in (120 mm)
5-1/8 in (130 mm)
Screw with
special washer
Cable end (Loop)
Terminal block
WARNING
Ring terminal
Screw with special
Screw with spe-
washer
cial washer
Ring terminal
Terminal block
WARNING
Tightening torque
11 to 16 lbf·in
(1.2 to 1.8 N·m)
Loop
Screw with spe-
cial washer
Cable end
(Loop)
Cable
Sleeve
Ring
terminal
Cable
En-8
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