Pipe Connection - Fujitsu AirStage AJY040LELAH Installation Manual

5.4. Pipe connection

Do not use mineral oil on a fl ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
While brazing the pipes, be sure to blow dry nitrogen gas through them.
The maximum lengths of this product are shown in the table. If the units are further apart
than this, correct operation cannot be guaranteed.
5.4.1 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 the 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 and outdoor units
respectively) onto the pipe and perform the fl are processing with a fl are tool. Leakage
of refrigerant 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.
Check if [L] is fl ared uniformly
and is not cracked or scratched.
L
Dimension A [mm]
Pipe outside diameter
Flare tool for R410A,
[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 (R22) fl are tools to fl are R410A pipes, the dimension A should
be approximately 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.
It is recommended that a R410A fl aring tool is used.
Pipe outside diameter
Width across
[mm (in)]
fl ats
6.35 (1/4)
9.52 (3/8)
12.70 (1/2)
15.88 (5/8)
19.05 (3/4)
5.4.2 Bending pipes
To prevent breaking of the pipe, avoid sharp bends. Bend the pipe with a radius of
curvature of 100 mm or more.
If the pipe is bent repeatedly at the same place, it will break.
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes at an angle of more than 90°.
• When pipes are repeatedly bent 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.
5.4.3 Pipe connection
Be sure to install the pipe against the port on the indoor unit and the outdoor unit cor-
rectly. If the centering is improper, the fl are nut cannot be tightened smoothly.
If the fl are nut is forced to turn, the threads will be damaged.
Do not remove the fl are nut from the outdoor unit pipe until immediately before connect-
ing the connection pipe.
After installing the piping, make sure that the connection pipes do not touch the com-
pressor or outer panel. If the pipes touch the compressor or outer panel, they will vibrate
and produce noise.
(1) Detach the caps and plugs from the
pipes.
(2) Center the pipe against the port on the
outdoor unit, and then turn the fl are nut
by hand.
(3) Tighten the fl are nut of the connection
pipe at the outdoor unit valve connec-
tor.
(4) After tightening the fl are nut by hand,
use a torque wrench to fully tighten it.
En-7
CAUTION
B
Die
A
Pipe
Dimension B
[mm]
clutch type
9.1
13.2
0 to 0.5 16.6
19.7
24.0
Width across flats of
Flare nut [mm]
17
22
26
29
36
CAUTION
CAUTION
3-way valve (Liquid)
Flare nut
Connection pipe
(Liquid)
Hold the torque wrench at its grip, keeping it in a right angle with the pipe, in order to
tighten the fl are nut correctly.
Outer panel may be distorted if
fastened only with a wrench. Be
sure to fi x the elementary part with a
holding wrench (spanner) and fasten
with a torque wrench (refer to below
diagram). Do not apply force to the
blank cap of the valve or hang a
wrench, etc., on the cap. If blank cap
is broken, it may cause leakage of
refrigerant.
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.
In the case of AJ*054LELAH
It is necessary to change a connection
pipe diameter by using Reducer.
(1) Reducer must be brazed in the
outside of the outdoor unit.
(2) Distance between 3-way valve and
reducer ≤ 1 m
(3) The part of Reducer do insulation
processing after brazing.
0
-0.4
5.4.4 Handling precautions for the valves
• Mounted part of Blank cap is sealed for protection.
• Fasten blank cap tightly after opening valves.
Operating the valves
• Use a hexagon wrench (size 4 mm).
Opening:
(1) Insert the hexagon wrench into the
valve shaft, and turn it counterclock-
wise.
(2) Stop turning when the valve shaft can
no longer be turned. (Open position)
Closing:
(1) Insert the hexagon wrench into the
valve shaft, and turn it clockwise.
(2) Stop turning when the valve shaft can
no longer be turned. (Closed position)
3-way valve
(Gas)
Flare nut
Connection
pipe (Gas)
CAUTION
Blank cap
Flare nut
Torque wrench
Holding
wrench
Tightening torque [N·m (kgf·cm)]
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 1100)
Example: Case of front connection
Connection pipe (Gas)
(Pipe outside dia.:
19.05 mm (3/4 in)
Brazing
1 m or less
Reducer Connection pipe (Gas)
(accessory) (Pipe outside dia.:
15.88 mm (5/8 in))
Opening
direction
Opening
Hexagon wrench
direction
Seal
(blank cap
installation
portion)
Liquid
Gas pipe
pipe
90°
Torque
wrench