En-7
6.1. Electrical requirement
• Select the power cable type and size
in accordance with relevant local and
national regulations.
• Specifications for local wiring power cord
and branch wiring are in compliance with
local code
Voltage rating
230 V
Operating
range
198 to 264 V (50 Hz)
198 to 253 V (60 Hz)
• 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
MFA
MCA:
Minimum Circuit Ampacity
MFA:
Maximum Fuse Ampacity
AUXS018GLEH
0.44 A
20 A
AUXS024GLEH
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 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. Earth leakage breaker requirements
• 2 indoor units (including RB unit) = 1 indoor unit of the 3D flow cassette type
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
44 or less
100 mA, 0.1 sec or less
45 to 148 (*2)
6.1.1. Cable speci
fi
cations
Recommended
cable size (mm
2
)
Cable type
Remark
Power supply
cable
2.5
Type245 IEC57 or
equivalent
2 Cable + earth (ground)
Transmission cable
0.33
LONWORKS compat-
ible cable
22 AWG
LEVEL 4 (NEMA) non-
polar 2 core, twisted pair
solid core diameter 0.65 mm
Remote controller
cable
(2-wire type)
0.33 to 1.25
Shield cable
Non-polar 2 core,
twisted pair
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
Earth (Ground) cable
20 mm
30 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
Screw with
special washer
Screw with
special washer
Cable end (Loop)
Loop
Terminal block
Cable end (Loop)
Cable
Cable
Do not apply branch wiring. It may result electric shock or fire.
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.
Strip 10 mm
Ring terminal
Sleeve
Screw with
special washer
Screw with
special washer
Ring terminal
Terminal block
Ring terminal
Cable
Cable
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.
Terminal number
Tightening torque
M3.5 screw
(Power supply/L, N, GND)
1.2 to 1.8 N·m
(12 to 18 kgf·cm)
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08-Feb-19 17:11:24
08-Feb-19 17:11:24
