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3. 8. 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 indoor unit and
outdoor unit.
• Use the included connection cables and power cables or ones specified by the
manufacturer. Improper connections, insufficient insulation, or exceeding the
allowable current can cause electric shock or fire.
• 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
overheating the terminals, electric shock, or fire.
• Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insufficient insulation, or exceeding the allowable
current can cause electric shock or fire.
• Match the terminal board numbers and connection cable colors with those of the
outdoor 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 leakage may occur.)
• 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.
• Install a ground leakage breaker. In addition, install the ground 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 earth (ground) cable.
Improper earthing (grounding) work can cause electric shocks.
• Install the remote control cables so as not to be touched directly 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.
• Ground the unit.
Do not connect the earth (ground) cable to a gas pipe, water pipe, lightning rod, or a
telephone earth (ground) cable.
Improper earthing (grounding) may cause electric shocks.
• Do not connect power supply cables to the transmission or remote control terminals,
as this will damage the product.
• Never bundle the power supply cable and transmission cable together. Bundling
these cables together will cause miss operation.
• When handling PCB, static electricity charged in the body may cause malfunction of
the PCB. Follow the cautions below:
– Establish a ground for the indoor and outdoor units and peripheral devices.
– Cut power (breaker) off.
– Touch metal part of the indoor and outdoor units for more than 10 seconds to dis-
charge static electricity charged in the body.
– Do not touch terminals of parts and patterns implemented on PCB.
3. 8. 1. Wiring system diagram
■ Connection cable (to outdoor unit)
■ Wired remote controller cable
2-wire type
Red
White
En-10
WARNING
CAUTION
Earth (ground)
Power line
Control line
3-wire type
Red
or
White
Black
3. 8. 2. Connection cable preparation
■ Connection cable
Keep the earth (ground) wire longer than the other wires.
Earth (ground) wire
• Use a 4-core wire cable.
■ Remote controller cable
For 2-wire type
30 mm
3. 8. 3. How to connect wiring to the terminals.
(1) Use ring terminals with insulating sleeves as shown in the figure below to connect to
the terminal block.
(2) Securely crimp the ring terminals to the wires using an appropriate tool so that the
wires do not come loose.
(3) Use the specified wires, 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
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 below for the terminal screw tightening torques.
Use ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause serious damage inside the
unit.
Tightening torque [N·m (kgf·cm)]
M4 screw
M5 screw
Screw with
special washer
Wire
Ring
terminal
Terminal blocks
3. 8. 4. Connection wiring
• Be careful not to mistake the power supply cable and connection wires when
installing.
• Install so that the wires for the remote controller will not come in contact with other
connection wires.
(1) Remove the control box cover and install each connection wire.
Loosen the screws.(3 locations)
Connection cable
For 3-wire type
30 mm
Ring
terminal
Sleeve
WARNING
1.2 to 1.8 (12 to 18)
2.0 to 3.0 (20 to 30)
Screw with
special
washer
Wire
Ring
terminal
CAUTION
Control box cover
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