En-8
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)
ARUH72TLAV2
8.13 A
15 A
ARUH96TLAV2
9.40 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 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
Maximum connectable “indoor units” or
“indoor units + RB units” (*1)
30 mA, 0.1 sec or less 12 or less
100 mA, 0.1 sec or less 13 to 40 (*2)
*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.
Use
Cable size
(AWG)
Cable type Remarks
Transmission
cable
22
LEVEL 4 (NEMA) non-polar 2 core,
twisted pair solid core diameter
0.026 in (0.65 mm)
LONWORKS®
compatible cable
Remote con-
troller cable
(2-wire type)
22 to 16 Sheathed PVC cable
Non polar 2 core,
twisted pair
18 Thermostat cable 2 core
Use sheathed non
twisted pair cable
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: The 3-wire type remote controller is not used.
(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.
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
Conduit connector
4-3/4 in (120 mm)
5-1/8 in (130 mm)
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)
Loop
Screw with
special washer
Screw with spe-
cial 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 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.
Sleeve
Strip 3/8 in
(10 mm)
Screw with spe-
cial washer
Screw with special
washer
Ring terminal
Cable
Terminal block
Cable
Ring terminal
Ring
terminal
WARNING
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.
Tightening torque
M4 screw
(Power supply/L1, L2 (N), GND)
11 to 16 lbf·in
(1.2 to 1.8 N·m)
9365748336-01_IM.indb Sec1:89365748336-01_IM.indb Sec1:8 9/16/2019 1:14:20 PM9/16/2019 1:14:20 PM
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