Installing Heat Insulation - Fujitsu AR 7 Installation Manual

Die
A
Pipe
Dimension A [in.
Pipe Outside
(mm)]
Diameter [in.
Flare Tool for R410A,
(mm)]
Clutch Type
1/4 (6.35)
3/8 (9.52)
1/2 (12.70) 0 to 0.020 (0 to 0.5)
5/8 (15.88)
3/4 (19.05)
When using conventional fl are tools to fl are R410A pipes,
the dimension A should be approximately 0.020 in. (0.5 mm)
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.
Pipe Outside
Width across
Width across
Diameter [in. (mm)]
fl ats
flats
1/4 (6.35)
3/8 (9.52)
1/2 (12.70)
5/8 (15.88)
3/4 (19.05)
7.3.2. 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 diffi 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.
7.3.3. Pipe connection
CAUTION
Be sure to install the pipe against the port on the indoor unit
correctly. If the centering is improper, the flare 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 at a 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
a hazardous gas if the refrigerant comes into contact with a
fl ame.
Check if [L] is fl ared uniformly
and is not cracked or scratched.
0
Dimension B
- 0.4
[in. (mm)]
3/8 (9.1)
1/2 (13.2)
5/8 (16.6)
3/4 (19.7)
15/16 (24.0)
Width Across Flats of
Flare Nut [in. (mm)]
11/16 (17)
7/8 (22)
1 (26)
1-1/8 (29)
1-7/16 (36)
CAUTION
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 wrench, then tighten with a
torque wrench. (See the following table for the fl are nut tight-
ening torques.)
Torque wrench
Indoor unit pipe
(Body side)
Flare Nut [in. (mm)] Tightening Torque [lbf·ft (N·m)]
1/4 (6.35) dia.
3/8 (9.52) dia.
1/2 (12.70) dia.
5/8 (15.88) dia.
3/4 (19.05) dia.

7.4. Installing heat insulation

Install the heat insulation material after performing a refriger-
ant leak check (see the Installation Manual for the outdoor
unit for details).
7.4.1. COUPLER HEAT INSULATION
• Insulate with the coupler heat insulation (Accessories)
around the gas pipe and liquid pipe at indoor unit.
• After installing the coupler heat insulation, wrap both ends
with vinyl tape so that there is no gap.
• After affi xing the coupler heat insulation, secure it with 2
cable ties (large), one on each end of the insulation.
• Make sure that the cable ties overlap the heat insulation
pipe.
Coupler heat
insulation (Acces-
sories)
Cable tie (Large)
(Accessories)
CAUTION
After checking for gas leaks (refer to the Installation Manual 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.
Tighten with 2 wrenches.
Holding spanner
Flare nut
Connection pipe
11.8 to 13.3 (16 to 18)
23.6 to 31.0 (32 to 42)
36.1 to 45.0 (49 to 61)
46.5 to 55.3 (63 to 75)
66.4 to 81.1 (90 to 110)
Cover this portion with
heat insulation.
Heat insulation
En-13