En-6
6.9.2. Bending pipes
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend or stretched, the material will harden, making it dif
Þ
cult
to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
CAUTION
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
6.9.3. Pipe connection
CAUTION
Be sure to Install the pipe against the port on the indoor unit correctly. If the center-
ing is improper, the
ß
are nut cannot tighten smoothly. If the
ß
are nut is forced to turn,
the threads will be damaged.
Do not remove the
ß
are nut from the indoor unit pipe until immediately before con-
necting the connection pipe.
Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order
to tighten the
ß
are nut correctly.
Tighten the
ß
are nuts with a torque wrench using the speci
Þ
ed tightening method.
Otherwise, the
ß
are nuts could break after a prolonged period, causing refrigerant to
leak and generate hazardous gas if the refrigerant comes into contact with a
ß
ame.
Connect the piping so that the control box cover can easily be removed for servicing
when necessary.
In order to prevent water from leaking into the control box, make sure that the piping
is well insulated.
When the flare nut is tightened properly by your hand, hold the body side coupling with a
wrench, then tighten with a torque wrench. (See the table below for the flare nut tightening
torques.)
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)]
Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia.
16 to 18 (160 to 180)
9.52 (3/8) dia.
32 to 42 (320 to 420)
12.70 (1/2) dia.
49 to 61 (490 to 610)
ELECTRICAL WIRING
7.
Wiring system diagram
7. 1.
WARNING
Before connecting the wires, make sure the power supply is OFF.
Every wire must be connected
Þ
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
Þ
re
hazard may also exist. Therefore, be sure all wiring is tightly connected.
Connect wires to the matching numbers of terminals.
Grounding line
Type 245 IEC57
(Inter-unit)
OUTDOOR UNIT
or BRANCH BOX
Please connect it to
the speci
Þ
ed terminal.
INDOOR UNIT
TERMINAL
Power line
Control line
Indoor unit wiring
7. 2.
(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
Þ
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
How to connect wiring to the terminals
7. 3.
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
Þ
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
Þ
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
Þ
rmly to the terminal block. Imperfect installation may
cause a
Þ
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
Þ
ed
outdoor unit or branch box.
