En-8
CAUTION
• Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order
to tighten the
fl
are nut correctly.
• Tighten the
fl
are nuts with a torque wrench using the speci
fi
ed tightening method.
Otherwise, the
fl
are nuts could break after a prolonged period, causing refrigerant to
leak and generate a hazardous gas if the refrigerant comes into contact with a
fl
ame.
Connection pipe
Tighten with 2 wrenches.
Holding Wrench
Flare nut
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [in (mm)]
Tightening torque [ft·lb (N·m)]
1/4 (6.35) dia.
12 to 13 (16 to 18)
3/8 (9.52) dia.
24 to 31 (32 to 42)
1/2 (12.70) dia.
36 to 45 (49 to 61)
5/8 (15.88) dia.
46 to 55 (63 to 75)
3/4 (19.05) dia.
66 to 81 (90 to 110)
3. 7. Fresh air intake
■
Processing before use
(1) When taking in fresh air, cut out the slit of the cabinet on the left side of the outer case
with nippers.
Slit
Cabinet (iron plate)
CAUTION
• When removing the cabinet (iron plate), be careful not to damage the indoor unit
internal parts and surrounding area (outer case).
• When processing the cabinet (iron plate), be careful not to injure yourself with burrs,
etc.
• When using the Fresh air intake, set the Room temperature sensor switching (Aux.)
to “Wired Remote Controller” (01), or to use the Remote sensor.
(2) Install the round
fl
ange to the fresh air intake.
Round
fl
ange (Locally purchased)
(3) Connect the duct to the round
fl
ange.
(4) Seal with a band and vinyl tape, etc. so that air does not leak from the connection.
Duct
3. 8. Electrical wiring
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.
• Use the included connection cables and power cables or ones speci
fi
ed by the manu-
facturer. Improper connections, insuf
fi
cient insulation, or exceeding the allowable
current can cause electric shock or
fi
re.
• 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. Im-
properly connected or secured cables can cause serious accidents such as overheat-
ing the terminals, 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 cur-
rent can cause electric shock or
fi
re.
• 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
fi
re.
• 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
fi
re through expo-
sure 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
fi
re 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
fi
rmly to the terminal board. Imperfect installation may
cause a
fi
re.
CAUTION
• 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)
Earth (ground) line
Power line
Control line
Indoor unit
Outdoor unit
Disconnect switch
(Locally purchased)
NOTES:
Disconnect Switch - Field supplied if required by local code. Select the correct
capacity of disconnect switch according to the load.
■
Wired remote controller cable
Red
White
2-wire type
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