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Fujitsu 9319357041 Installation Manual page 6

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[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
Connection pipe [6.35-mm (1/4-in.) dia.]
Bend R70 mm
Connection pipe [9.52- or 12.7-mm (3/8- or 1/2-in.)]
(2-3/4 in.) with
a pipe bender
Indoor unit
After hooking the indoor unit to the top hook, hook the fi 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)
Tighten the fl are nuts with a torque wrench using the specifi ed tightening method. Oth-
erwise, 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.
6.9.1. Flaring
Use special pipe cutter and fl 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 fl are nut (always use the fl are nut attached to the indoor unit(s) and outdoor unit
or branch box respectively) onto the pipe and perform the fl are processing with a fl are
tool. Use the special R410A fl are tool, or the conventional fl are tool. Leakage of refriger-
ant may result if other fl 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
A
Pipe
Dimension A [mm (in.)]
Pipe outside diameter
[mm (in.)]
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
When using conventional fl are tools to fl are R410A pipes, the dimension A should be ap-
proximately 0.5 mm (1/32 in.) more than indicated in the table (for fl aring with R410A fl are
tools) to achieve the specifi ed fl aring. Use a thickness gauge to measure the dimension A.
Width across
Pipe outside diameter [mm (in.)]
flats
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
En-6
(Spacer)
Align the marks
Wall hook bracket
Top hooks
Bottom hooks
CAUTION
Check if [L] is flared uniformly
and is not cracked or scratched.
B
L
Dimension B [mm (in.)]
Flare tool for R410A,
clutch type
9.1 (11/32)
13.2 (17/32)
0 to 0.5
16.6 (21/32)
(0 to 1/32)
19.7 (25/32)
24.0 (15/16)
Width across flats
of Flare nut [mm (in.)]
17 (21/32)
22 (7/8)
26 (1-1/32)
29 (1-5/32)
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 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.
6.9.3. Pipe connection
Be sure to Install the pipe against the port on the indoor unit correctly. If the center-
ing 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 fl 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 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 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.)
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.
CAUTION
CAUTION
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Tightening torque [N·m (lb·ft)]
16 to 18 (11.8 to 13.3)
32 to 42 (23.6 to 31.0)
49 to 61 (36.1 to 45.0)
63 to 75 (46.5 to 55.3)
90 to 110 (66.4 to 81.1)

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