AirStage ABYA036GTEH Manuel d'installation - Page 6

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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
available 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)

4.2. Pipe requirement

Refer to the Installation Manual of the outdoor unit for description of the length of
connecting pipe or for diff erence of its elevation.
• 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 specifi ed, 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 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.
4.3.1. Flaring
Use special 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 and outdoor units (or
RB unit) respectively) onto the pipe and perform the fl are processing with a fl are tool.
Use the special R410A 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.
Die
A
Pipe
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)
En-5
CAUTION
Thickness [mm]
0.80
0.80
0.80
1.00
1.20
CAUTION
CAUTION
WARNING
Check if [L] is fl ared uniformly
B
and is not cracked or scratched.
Dimension A [mm]
Dimension B
Flare tool for R410A,
clutch type
0 to 0.5
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.
Width across
fl ats
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 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.
4.3.3. Pipe connection
(1) Remove the fi lter guide.
(2) Attach the connection pipe.
• For ② Top piping and ③ Right piping connections, use the Auxiliary pipe (Gas pipe)
provided.
0
[mm]
-
0.4
9.1
13.2
16.6
Connection pipe (Gas)
19.7
24.0
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)
CAUTION
Indoor unit
Indoor unit
② Top piping
Auxiliary pipe (Gas pipe)
(Accessories)
③ Right piping
Width across fl ats
of Flare nut [mm]
17
22
26
29
36
Filter guide
Large pipe
Small pipe
Connection pipe (Gas)
Indoor unit (Rear)