Electrical Wiring; Wiring System Diagram; Indoor Unit Wiring; How To Connect Wiring To The Terminals - Fujitsu asyg18lfca Installation Manual

6.6.2. 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
diffi cult to bend or stretch them any more.
• Do not bend or stretch the pipes more than 3 times.
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
6.6.3. Pipe connection
Be sure to Install the pipe against the port on the indoor unit correctly. If the centering
is improper, the fl are nut cannot tighten smoothly. If the fl are nut is forced to turn, the
threads will be damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before
connecting the connection pipe.
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 specifi ed tightening method.
Otherwise, the fl are nuts could break after a prolonged period, causing refrigerant to
leak and generate hazardous gas if the refrigerant comes into contact with a fl 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 fl are 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 fl are nut tightening
torques.)
Tighten with two wrenches.
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.

7. ELECTRICAL WIRING

Cable Cable size (mm
Connection cable 1.5
Max. Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage drop
is 2% or more.
] 1

7.1. Wiring system diagram

Type 60245 IEC57
Cable size 1.5 mm
INDOOR UNIT
(Inter-unit) Power lines
TERMINAL
Earthing (Grounding) line
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.
En-5
CAUTION
CAUTION
Wrench (fi xed)
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)
2
) Type Remarks
Type 60245 IEC57 3Cable+Earth (Ground), 1φ230V
OUTDOOR UNIT
2
or BRANCH BOX
Power line
Please connect it to
Control line
the specifi ed terminal.
CAUTION

7.2. Indoor unit wiring

(1) Remove the cable clamp.
(2) Bend the end of the connection cable as shown in the fi gure.
(3) Connect the end of the connection cable fully inserting into the terminal block.
(4) Fasten the connection cable with a cable clamp.
Cable clamp
(There is a
terminal block
inside.)
Screw
1 2 3 4
Connection cable

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
(3) Use the specifi 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
(6) See the table for the terminal
screw tightening torques.
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 earth (ground) wire.
Do not use the earth (ground) screw of the indoor unit for the connection other than a
specifi ed outdoor unit or branch box.
Earth (Ground) wire
Connection
cable
Cable clamp
Tab
Screw
Square hole
Insert the tab into the square hole of the
indoor unit and fasten with a screw.
Crimp-type terminal
Sleeve
Screw with
special washer
Crimp-type
terminal
Wire
Tightening torque [N·m (kgf·cm)]
M4 screw 1.2 to 1.8 (12 to 18)
CAUTION