Installing Heat Insulation - Fujitsu AUXB07L Installation Manual

Dimension A [mm]
Pipe outside
diameter
Flare tool for R410A,
[mm (in.)]
clutch type
6.35 (1/4)
9.52 (3/8)
12.70 (1/2) 0 to 0.5
15.88 (5/8)
19.05 (3/4)
When using conventional flare tools to flare R410A pipes,
the dimension A should be approximately 0.5 mm more
than indicated in the table (for flaring with R410A flare tools)
to achieve the specified flaring. Use a thickness gauge to
measure the dimension A.
Pipe outside
Width across
diameter [mm (in.)]
flats
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
4.3.2. 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 difficult to bend or stretch them any
more.
• Do not bend or stretch the pipes more than three times.
CAUTION
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.
4.3.3. Pipe connection
When the flare nut is tightened properly by your hand, hold
the body side coupling with a separate spanner, then tighten
with a torque wrench. (See the table below for the flare nut
tightening torques.)
CAUTION
• Hold the torque wrench at its grip, keeping it in the right
angle with the pipe, in order to tighten the flare nut correctly.
• Tighten the flare nuts with a torque wrench using the
specified tightening method. Otherwise, the flare nuts could
break after a prolonged period, causing refrigerant to leak
and generate a hazardous gas if the refrigerant comes into
contact with a flame.
Torque wrench
Indoor unit pipe
(Body side)
Dimension B 0
- 0.4
[mm]
9.1
13.2
16.6
19.7
24.0
Width across flats
of Flare nut [mm]
17
22
26
29
36
Tighten with two wrenches.
Holding wrench
Flare nut
Connection pipe
Flare nut [mm (in.)] Tightening torque [N·m (kgf·cm)]
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.

4.4. Installing heat insulation

Install the heat insulation material after performing a
refrigerant leak check (see the Installation Manual for the
outdoor unit for details).
COUPLER HEAT INSULATION
• Insulate by the coupler heat insulation (Accessories)
around the gas pipe and liquid pipe of indoor side.
• After installing the coupler heat insulation, wrap both end
with vinyl tape so that there is no gap.
• After affixing the coupler heat insulation, secure it with two
bin-ders (large), one on each end of the insulation.
• Make sure that the binders overlap the heat insulation
pipe.
Coupler heat
insulation
(Accessories)
Binder (Large)
(Accessories)
CAUTION
• After checking for gas leaks (refer to the Installation
of the outdoor unit), perform this section.
• Install heat insulation around both the large (gas) and small
(liquid) pipes. Failure to do so may cause water leaks.
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)
Cover this portion with
heat insulation.
Heat insulation
Manual
En-7