En-6
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
MFA
AUXB004GLEH
0.20 A
20 A
AUXB007GLEH
0.20 A
AUXB009GLEH
0.20 A
AUXB012GLEH
0.24 A
AUXB014GLEH
0.29 A
AUXB018GLEH
0.30 A
AUXB024GLEH
0.75 A
MCA: Minimum Circuit Ampacity
MFA: Maximum Fuse Ampacity
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 15 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
44 or less
100 mA, 0.1 sec or less
45 to 148 **
* Heat pump type: indoor units, Heat recovery type: indoor units and RB units.
** If the 100 mA capacity breaker is not provided, split the quantity of the indoor units into
small groups of 44 units or less and provide a breaker with capacity of 30 mA for each
group.
6.1.1. Cable specifications
Recommended
cable size (mm
2
)
Cable type
Remark
Power supply
cable
2.5
Type60245 IEC57 or
equivalent
2 Cable + earth
(ground)
Transmission
cable
0.33
LONWORKS com-
patible cable
22 AWG LEVEL 4
(NEMA) non-polar 2
core, twisted pair solid
core diameter 0.65 mm
Remote control-
ler cable (2-wire
type)
0.33 to 1.25
Sheathed PVC
cable*
Non-polar 2 core,
twisted pair
*: Use shielded cable in accordance with local rules for remote controller cable.
6.2. Wiring method
Example
*2
*2
*2
*3
*3
*3
Outdoor unit or RB unit *1
Transmission
Transmission
Indoor unit
Remote controller
(Master)
Power supply
Indoor unit
Indoor unit
Power supply
Remote
control
Breaker
Breaker
Breaker
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: The 3-wire type remote controller 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
Power supply
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 the figure.
Earth (Ground)
cable
20 mm
50 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 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 fix 2 power supply cables with 1 screw.
Strip 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 ter
minal 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 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 brea
k.
(6) See the table for the terminal screw tightening torques.
(7) Please do not fix 2 power supply cables with 1 screw.
Strip 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 /L, N, GND)
1.2 to 1.8 N•m (12 to 18 kgf•cm)
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