En-6
7. ELECTRICAL WIRING
Cable
Cable size (mm
2
)
Type
Remarks
Connection cable
1.5
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.
7.1. Wiring system diagram
WARNING
Before connecting the wires, make sure the power supply is OFF.
Every wire must be connected
fi
rmly.
No wire should be allowed to touch refrigerant tubing, the compressor or any moving
part.
Loose wiring may cause the terminal to overheat or result in unit malfunction. A
fi
re
hazard may also exist. Therefore, be sure all wiring is tightly connected.
Connect wires to the matching numbers of terminals.
Grounding line
Type 60245 IEC57
Cable size 1.5mm
2
(Inter-unit)
OUTDOOR UNIT
or BRANCH BOX
Please connect it to
the speci
fi
ed terminal.
INDOOR UNIT
TERMINAL
Power line
Control line
7.2. Indoor unit wiring
(1) Remove the wire cover. (Remove the 1 screw.)
(2) Remove the cable clamp. (Remove the 1 screw.)
(3) Bend the end of the connection cable as shown in the
fi
gure.
(4) Connect the end of the connection cable fully inserting into the terminal block.
(5) Fasten the connection cable with a cable clamp. (Attach the 1 screw.)
Insert the wire cover tab into the square hole
of the indoor unit and fasten with a screw.
End of connection cable
30 mm
Cable clamp
Connection
cable
Screw
Screw
Wire cover
Connection cable
Terminal block
Cable clamp
Connection
cable
Screw
Screw
Wire cover
50 mm
7.3. How to connect wiring to the terminals
Caution when wiring cable
When stripping off the insulation of a lead wire, always use a special tool such as a wire
stripper. If there is no special tool available, carefully strip the insulation with a knife etc.
(1) Use crimp-type terminals with insulating sleeves as shown in the
fi
gure below to con-
nect to the terminal block.
(2) Securely clamp the crimp-type terminals to the wires using an appropriate tool so that
the wires do not come loose.
Strip : 10 mm
Crimp-type
terminal
Sleeve
(3) Use the speci
fi
ed 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 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.
Screw with special washer
Wire
Crimp-type terminal
Terminal blocks
Wire
Screw with special washer
Crimp-type
terminal
(6) See the table below for the terminal screw tightening torques.
Tightening torque [N·m (kgf·cm)]
M4 screw
1.2 to 1.8 (12 to 18)
CAUTION
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.
Connect the connection cables
fi
rmly to the terminal block. Imperfect installation may
cause a
fi
re.
Always fasten the outside covering of the connection cable with the cable clamp. (If
the insulator is chafed, electric discharge may occur.)
Always connect the ground wire.
Do not use the earth screw of the indoor unit for the connection other than a speci
fi
ed
outdoor unit or branch box.
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