Fujitsu 9319357041 Installation Manual Download Page 6

Page: 6 / 14

En-6

[Installing the indoor unit]

• Hang the indoor unit from the hooks at the top of the wall hook bracket.
• Insert the spacer, etc. between the indoor unit and the wall hook bracket and separate

the bottom of the indoor unit from the wall.

Indoor unit

Wall hook bracket

(Spacer)

Connection pipe [6.35-mm (1/4-in.) dia.]

Align the marks

Indoor unit

Connection pipe [9.52- or 12.7-mm (3/8- or 1/2-in.)]

Top hooks

Bottom hooks

Wall hook bracket

Bend R70 mm
(2-3/4 in.) with
a pipe bender

After hooking the indoor unit to the top hook, hook the

ttings of the indoor unit to the 2

bottom hooks while lowering the unit and pushing it against the wall.

6.9. Flare connection (Pipe connection)

CAUTION

Tighten the

are nuts with a torque wrench using the speci

ed tightening method. Oth-

erwise, 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.

6.9.1. Flaring

Use special pipe cutter and

are tool exclusive for R410A.

(1)  Cut the connection pipe to the necessary length with a pipe cutter.
(2)  Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3)  Insert the

are nut (always use the

are nut attached to the indoor unit(s) and outdoor unit

or branch box respectively) onto the pipe and perform the

are processing with a

are

tool. Use the special R410A

are tool, or the conventional

are tool. Leakage of refriger-

ant may result if other

are nuts are used.

(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from

entering the pipes.

Die

Pipe

Check if [L] is flared uniformly
and is not cracked or scratched.

Pipe outside diameter

[mm (in.)]

Dimension A [mm (in.)]

Dimension B [mm (in.)]

Flare tool for R410A,

clutch type

6.35 (1/4)

0 to 0.5

(0 to 1/32)

9.1 (11/32)

9.52 (3/8)

13.2 (17/32)

12.70 (1/2)

16.6 (21/32)

15.88 (5/8)

19.7 (25/32)

19.05 (3/4)

24.0 (15/16)

When using conventional

are tools to

are R410A pipes, the dimension A should be ap-

proximately 0.5 mm (1/32 in.) more than indicated in the table (for

aring with R410A

are

tools) to achieve the speci

aring. Use a thickness gauge to measure the dimension A.

Width across

flats

Pipe outside diameter [mm (in.)]

Width across flats

of Flare nut [mm (in.)]

6.35 (1/4)

17 (21/32)

9.52 (3/8)

22 (7/8)

12.70 (1/2)

26 (1-1/32)

15.88 (5/8)

29 (1-5/32)

19.05 (3/4)

36 (1-13/32)

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

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

are nut cannot tighten 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 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 (lb·ft)]

6.35 (1/4) dia.

16 to 18 (11.8 to 13.3)

9.52 (3/8) dia.

32 to 42 (23.6 to 31.0)