Fujitsu AUXG-KVLA Series Installation Manual Download Page 8

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En-8

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Bending pipes

CAUTION

• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.

•   The pipes are shaped by your hands. Be careful not to collapse them.
•   Bend R70 mm or more with a pipe bender.
•   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

cult

to bend or stretch them anymore.

• Do not bend or stretch the pipes more than 3 times.
• When bending the pipe, do not bend it as

is. The pipe will be collapsed. In this case,
cut the insulating pipe with a sharp cutter
as shown on the right, and bend it after
exposing the pipe. After bending the pipe
as you want, be sure to put the heat insu-
lating pipe back on the pipe, and secure it
with tape.

Pipe

Insulating
pipe

Cutter

Cut line

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Flare connection

CAUTION

• Be sure to install the pipe against the port on the indoor unit correctly. If the center-

ing is improper, the

are nut cannot be tightened smoothly. If the

are nut is forced

to turn, the threads will be damaged.

• Do not remove the

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

are nut correctly.

• Tighten the

are nuts with a torque wrench using the speci

ed tightening method.

Otherwise, the

are nuts could break after a prolonged period, causing refrigerant to

leak and generate hazardous gas if the refrigerant comes into contact with a

ame.

• Connect the piping so that the control box cover can easily be removed for servic-

ing when necessary.

• In order to prevent water from leaking into the control box, make sure that the pip-

ing is well insulated.

(1) Detach the caps and plugs from the pipes.
(2) Center the pipe against the port on the indoor unit, and then turn the

are nut by hand.

Connection pipe
(Gas)

Connection pipe
(Liquid)

Indoor unit

(3) When the flare nut is tightened properly by your hand, hold the body side coupling with

a wrench, then tighten with a torque wrench. (Refer to the following table 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)

15.88 (5/8) dia.

63 to 75 (630 to 750)

19.05 (3/4) dia.

90 to 110 (900 to 1,100)

Do not remove the cap from the connection pipe before connecting the pipe.

3.6. Electrical wiring

WARNING

• Electrical work must be performed in accordance with this Manual by a person certi

under the national or regional regulations. Be sure to use a dedicated circuit for the
unit. An insuf

cient power supply circuit or improperly performed electrical work can

cause serious accidents such as electric shock or

re.

• 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 over-
heating the terminals, electric shock, or

re.

• Securely install the electrical box cover on the unit. An improperly installed electrical

box cover can cause serious accidents such as electric shock or

re through exposure

to dust or water.

• 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 speci

ed by the

manufacturer. Improper connections, insuf

cient insulation, or exceeding the allowable

current can cause electric shock or

re.

• Do not modify the power cables, use extension cables, or use any branches in the

wiring. Improper connections, insuf

cient insulation, or exceeding the allowable current

can cause electric shock or

re.

• 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.

• 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

re.

• Always fasten the outside covering of the connection cable with the cable clamp. (If

the insulator is chafed, electric leakage may occur.)

• Install an 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

re could result.

• Always connect the earth (ground) cable. Improper earthing (grounding) work can

cause electric shocks.

• Perform wiring work in accordance with standards so that the air conditioner can be

operated safely and positively.

• Connect the connection cable

rmly to the terminal board. Imperfect installation may

cause a

re.

• Use ring terminals and tighten the terminal screws to the speci

ed torques, otherwise,

abnormal overheating may be produced and possibly cause heavy damage inside
the unit.

CAUTION

• Be careful not to generate a spark as follows for using a

ammable refrigerant.

- Do not remove the fuse while the power is on.
- Do not disconnect the wiring while the power is on.
- It is recommended to position the outlet connection in a high position. Place the

cords so that they do not get tangled.

• 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 (ground-
ing) may cause electric shock.

• Install the remote controller cables so as not to be direct touched with your hand.
• Do not connect power supply cables to the transmission or remote controller termi-

nals, as this will damage the product.

• Never bundle the power supply cable and transmission 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 an earth (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.

• Be sure to refer to the above diagram for do correct

eld wiring. Wrong wiring causes