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6. ELECTRICAL WIRING
Electrical work must be performed in accordance with this manual by a person certified
under the national or regional regulations. Be sure to use a dedicated circuit for the unit.
An insufficient power supply circuit or improperly performed electrical work can cause
serious accidents such as electric shock or fire.
Before starting work, check that power is not being supplied to the all units.
For wiring, use the prescribed type of cables, connect them securely, making sure that
there are no external forces of the cables applied to the terminal connections.
Improperly connected or secured cables can cause serious accidents such as overheat-
ing the terminals, electric shock, or fire.
Securely install the electrical box cover on the unit.
An improperly installed electrical box cover can cause serious accidents such as electric
shock or fire through exposure to dust or water.
Install sleeves into any holes made in the walls for wiring. Otherwise, a short circuit
could result.
Use the included connection cables and power cables or ones specified by the
manufacturer. Improper connections, insufficient electrical insulation, or exceeding the
allowable current can cause electric shock or fire.
Do not modify the power cables, use extension cables, or use any branches in the wir-
ing. Improper connections, insufficient electrical insulation, or exceeding the allowable
current can cause electric shock or fire.
Match the terminal block numbers and connection cable colors with those of the outdoor
unit (or RB unit). Erroneous wiring may cause burning of the electric parts.
Securely connect the connection cables to the terminal board. In addition, secure the
cables with wiring holders. Improper connections, either in the wiring or at the ends of
the wiring, can cause a malfunction, electric shock, or fire.
Always fasten the outside covering of the connection cable with the cable clamp. (If the
insulator is chafed, electric discharge may occur.)
Install an earth leakage breaker. In addition, install the earth leakage breaker so that the
entire AC main power supply is cut off at the same time. Otherwise, electric shock or fire
could result.
Always connect the ground (earth) cable.
Improper grounding (earthing) work can cause electric shocks.
Install the remote controller cables so as not to be direct touched with your hand.
Perform wiring work in accordance with standards so that the air conditioner can be
operated safely and positively.
Connect the connection cable firmly to the terminal board. Imperfect installation may
cause a fire.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
Ground (earth) the unit.
Do not connect the ground (earth) cable to a gas pipe, water pipe, lightning rod, or a
telephone ground (earth) cable.
Improper grounding (earthing) may cause electric shock.
Do not connect power supply cables to the transmission or remote controller terminals,
as this will damage the product.
Never bundle the power supply cable and transmission cable, remote controller cable
together.
Separate these cable by 50 mm or more.
Bundling these cables together will cause miss operation or breakdown.
When handling PCB, static electricity charged in the body may cause malfunction of the
PCB. Follow the cautions below:
• Establish an ground (earth) for the indoor and outdoor units and peripheral devices.
• Cut power (breaker) off.
• Touch metal part of the indoor unit for more than 10 seconds to discharge static elec-
tricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.
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
• 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.
WARNING
CAUTION
Voltage rating
230 V
Operating
198 to 264 V
range
A. Current breaker requirements
Model
MCA
MFA
ARXD004HLAH
0.29 A
ARXD005HLAH
0.29 A
ARXD007HLAH
0.32 A
ARXD009HLAH
0.35 A
ARXD012HLAH
0.35 A
20 A
ARXD014HLAH
0.63 A
ARXD018HLAH
0.58 A
ARXD024HLAH
0.81 A
ARXP009HLAH
0.58 A
ARXP012HLAH
0.95 A
ARXP014HLAH
0.95 A
B. Earth leakage breaker requirements
Maximum connectable "indoor units" or "indoor
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 44 units or less and provide a breaker with capacity of 30 mA for
each group.
6.1.1. Cable specifications
Follow the specifi cations below for the power supply, transmission and remote controller
cable.
Recommended
cable size (mm²)
Power supply
Type60245 IEC57
2.5
cable
or equivalent
Transmission
LONWORKS com-
0.33
cable
patible cable
Remote control-
Sheathed PVC
ler cable (2-wire
0.33 to 1.25
cable (*1)
type)
*1: Use shielded cable in accordance with local rules for remote controller cable.
6.2. Wiring method
Example
Outdoor unit or RB unit (*1)
Transmission
Indoor unit
Remote
Transmission
control
Power supply
(*2)
Breaker
(*3)
Power supply
Remote controller
(primary)
*1: When connecting to the Heat Recovery System, refer to the installation manual of the
RB unit.
*2: Ground (earth) the remote controller if it has an ground (earth) cable.
*3: The 3-wire type remote controller is not used.
(Crossover wiring of power supply)
Indoor unit
Power supply
Power supply
Pull box
Breaker
Power supply
MCA: Minimum Circuit Ampacity
MFA: Main 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.
units + RB units" (*1)
44 or less
45 to 148 (*2)
Cable type
Remark
2 Cable + ground (earth)
22 AWG LEVEL 4 (NEMA)
nonpolar 2 core, twisted pair
solid core diameter 0.65 mm
Nonpolar 2 core, twisted pair
Indoor unit
Indoor unit
(*2)
Breaker
Breaker
(*3)
Remote controller
Remote controller
(secondary)
Indoor unit
Indoor unit
Power supply
Pull box
(*2)
(*3)
En-10
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