En-7
A. Current breaker requirements
Model
MCA
MAX. CKT. BKR
(Fuse capacity)
• 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.
AUUA4TLAV2
0.29 A
15 A
AUUA7TLAV2
0.51 A
AUUA9TLAV2
0.51 A
AUUA12TLAV2
0.51 A
AUUA14TLAV2
0.51 A
AUUA18TLAV2
0.51 A
AUUA24TLAV2
0.78 A
B. Ground Fault Equipment 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 36 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 specifications
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.
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.
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.
Conduit connector
Earth (Ground)
wire
2-3/4 in (70 mm)
1-3/4 in (45 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.
(4) 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.
(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 1 in
(25 mm)
Loop
Screw with
special washer
Screw with
special washer
Cable end (Loop)
Cable end (Loop)
Cable
Cable
Terminal block
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.
(5) 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.
(6) Do not tighten the terminal screws too much, otherwise, the screws may break.
(7) See the table for the terminal screw tightening torques.
(8) Please do not fix 2 power supply cables with 1 screw.
Strip 3/8 in
(10 mm)
Sleeve
Screw with
special washer
Screw with
special washer
Ring terminal
Cable
Cable
Terminal block
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)
9371022659-02_L3.indb Sec1:7
9371022659-02_L3.indb Sec1:7
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9/24/2019 11:10:55 AM