Pipe Installation; Selecting The Pipe Material; Pipe Requirement; Flare Connection (Pipe Connection) - Fujitsu AirStage AS A009GCGH Series Installation Manual

Installing the drain cap
Use a hexagonal wrench 4 mm at opposite side to
No gap
insert the drain cap, till the drain cap contacts the
tip of drain cock.
Hexagonal
Drain cock
wrench
Drain cap
(2) Align the marks on the wall
Wall hook bracket
hook bracket and shape
the connection pipe.
For left piping and left rear
piping, align the marks on
the wall hook bracket and
shape the connection pipe.
(3) Bend the connection piping
at the bend radius of 70
mm or more and install
no more than 35 mm from
Connection piping
the wall.
3.3.5 Installing the indoor unit
(1) After passing the indoor piping and drain hose through the wall hole, hang the indoor
unit on the hooks at the top and bottom of the wall hook bracket.
After hooking the indoor unit to the top hook, hook the fittings of the indoor unit to the
2 bottom hooks while lowering the unit and pushing it against the wall.
Indoor unit
Top hooks
(2) Insert the spacer, etc. between the indoor
unit and the wall hook bracket and separate
the bottom of the indoor unit from the wall.

4. PIPE INSTALLATION

Be more careful that foreign matter (oil, water, etc.) does not enter the piping than with
refrigerant R410A models. Also, when storing the piping, securely seal the openings by
pinching, taping, etc.
While welding the pipes, be sure to blow dry nitrogen gas through them.

4.1. Selecting the pipe material

Do not use existing pipes from another refrigeration system or refrigerant.
Use pipes that have clean external and internal sides without any contamination which
may cause trouble during use, such as sulfur, oxide, dust, cutting waste, oil, or water.
It is necessary to use seamless copper pipes.
Material: Phosphor deoxidized seamless copper pipes.
It is desirable that the amount of residual oil is less than 40 mg/10 m.
Do not use copper pipes that have a collapsed, deformed, or discolored portion (es-
pecially on the interior surface). Otherwise, the expansion valve or capillary tube may
become blocked with contaminants.
Improper pipe selection will degrade performance. As an air conditioner using R410A
incurs pressure higher than when using conventional (R22) refrigerant, it is necessary to
choose adequate materials.
• Thicknesses of copper pipes used with R410A are as shown in the table.
• Never use copper pipes thinner than those indicated in the table even if they are avail-
able on the market.
Thicknesses of Annealed Copper Pipes (R410A)
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)
Alignment marks
Connection pipe (Gas pipe)
Connection pipe (Liquid pipe)
Wall hook bracket
Bottom hooks
Indoor unit
(Spacer)
Wall hook bracket
CAUTION
CAUTION
Thickness [mm]
0.80
0.80
0.80
1.00
1.20

4.2. Pipe requirement

Refer to the installation manual for the outdoor unit for description of allowable pipe
length and height difference.
Use pipe with water-resistant heat insulation.
Install heat insulation around both the gas and liquid pipes. Failure to do so may cause
water leaks.
Use heat insulation with heat resistance above 120 °C. (Reverse cycle model only)
In addition, if the humidity level at the installation location of the refrigerant piping is
expected to exceed 70 %, install heat insulation around the refrigerant piping.
If the expected humidity level is 70 to 80 %, use heat insulation that is 15 mm or thicker
and if the expected humidity exceeds 80 %, use heat insulation that is 20 mm or thicker.
If heat insulation is used that is not as thick as specified, condensation may form on the
surface of the insulation.
In addition, use heat insulation with heat conductivity of 0.045 W/(m·K) or less
(at 20 °C).

4.3. Flare connection (pipe connection)

Tighten the flare nuts with a torque wrench using the specified tightening method. Oth-
erwise, the flare nuts could break after a prolonged period, causing refrigerant to leak
and generate hazardous gas if the refrigerant comes into contact with a flame.
4.3.1 Flaring
Use special flare 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 flare nut (always use the flare nut attached to the indoor and outdoor units
(or RB unit) respectively) onto the pipe and perform the flare processing with a flare
tool. Use the special R410A flare tool. Leakage of refrigerant may result if other flare
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 flared uniformly
and is not cracked or scratched.
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)
15.88 (5/8)
19.05 (3/4)
When using conventional (R22) 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.
It is recommended that a R410A flaring tool is used.
Width across flats Pipe outside diameter [mm (in)] Width across flats of Flare nut [mm]
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
• The pipes are shaped by your hands or pipe bender. 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 anymore. 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.
CAUTION
CAUTION
WARNING
Die
Pipe
0
Dimension B
-0.4
9.1
13.2
0 to 0.5 16.6
19.7
24.0
17
22
26
29
36
CAUTION
[mm]
En-4