En-7
6. ELECTRICAL WIRING
Cable
Cable size (mm
2
)
Type
Remarks
Connection cable
1.5 (MIN.)
Type 60245 IEC57 Ground, 1
φ
230V
Max. Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage drop is
2% or more.
For simultaneous multi ( 22,24 model only )
Conductor size (mm
2
)
Max length (m)
Bus wire
0.3 (MIN.)
500*
* This length shall be the total extended length in the system of the group.
(Total length of bus wire and remote controller cable.)
Install all electrical works in accordance to standard.
•
Install the disconnect device with a contact gap of at least 3mm in all poles nearby the
•
units. (Both indoor unit and outdoor unit)
Wiring size must comply with the applicable country or region's regulations.
•
WARNING
Electrical work must be performed in accordance with this Manual by a person certi
fi
ed
under the national or regional regulations. Be sure to use a dedicated circuit for the
unit.
An insuf
fi
cient power supply circuit or improperly performed electrical work can cause
serious accidents such as electric shock or
fi
re.
Before starting work, check that power is not being supplied to the indoor unit and
outdoor unit.
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
fi
re.
Securely install the electrical box cover on the unit.
An improperly installed electrical box cover can cause serious accidents such as
electric shock or
fi
re 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, insuf
fi
cient insulation, or exceeding the allowable
current can cause electric shock or
fi
re.
Do not modify the power cables, use extension cables, or use any branches in the
wiring. Improper connections, insuf
fi
cient insulation, or exceeding the allowable current
can cause electric shock or
fi
re.
Match the terminal block numbers and connection cable colors with those of the
outdoor unit or branch box. 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
fi
re.
Always fasten the outside covering of the connection cable with the cable clamp. (If the
insulator is chafed, electric leakage may occur.)
Install a 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
fi
re could result.
Always connect the earth cable.
Improper grounding 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
fi
rmly to the terminal board. Imperfect installation may
cause a
fi
re.
CAUTION
Ground the unit.
Do not connect the earth cable to a gas pipe, water pipe, lightning rod, or a telephone
earth cable.
Improper grounding 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 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
discharge static electricity charged in the body.
• Do not touch terminals of parts and patterns implemented on PCB.
(1) Use ring terminals with insulating sleeves as shown in the
fi
gure 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 speci
fi
ed 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
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
fi
x 2 power supply cables with 1 screw.
Strip 10 mm
Sleeve
Screw with spe-
cial 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 speci
fi
ed torques, otherwise,
abnormal overheating may be produced and possibly cause heavy damage inside the
unit.
Tightening torque [N·m (kgf·cm)]
M4 screw
1.2 to 1.8 (12 to 18)
M5 screw
2.0 to 3.0 (20 to 30)
6.1. Wiring system diagram
Connection diagrams
Standard pair:
Indoor
unit side
Power line
Earth (Ground) line
Black
White
Red
*
Control line
Wired remote controller cable
Connection cable to outdoor unit
*Ground the remote controller if it has a earth (ground) wire.
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