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Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
5.2. Installing heat insulation
After checking for gas leaks, insulate by wrapping insulation around the two parts (Gas
and Liquid) of the indoor unit coupling, using the coupler heat insulation.
After installing the coupler heat insulation, wrap both ends with vinyl tape so that there is
no gap.
Secure both ends of the heat insulation material using nylon fasteners.
There should be no gaps between the insulation and the product.
After connecting the piping, check the all joints for gas leakage with gas leak detector.
Once the pressure checking has been completed using nitrogen, please refer to the
outdoor unit installation manual to complete the evacuation process.
Install heat insulation around both the large (gas) and small (liquid) pipes. Failure to
do so may cause water leaks.
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 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 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.
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [N·m (kgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1,100)
Coupler heat insulation (Small)
Coupler heat insulation (Large)
CAUTION
CAUTION
WARNING
• 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 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
wiring. Improper connections, insufficient 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. 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.)
• 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 fire could result.
• Always connect the earth (ground) cable.
Improper earthing (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 firmly to the terminal board. Imperfect installation may
cause a fire.
• Earth (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 shock.
• Do not connect power supply cables to the connection or remote controller terminals,
as this will damage the product.
• Never bundle the power supply cable and connection 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 figure 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 specified 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 fix 2 power supply cables with 1 screw.
WARNING
CAUTION
En-7
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