AirStage ASUB18RLAV, Installation Manual

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Do not use copper pipes that have a collapsed, deformed, or discolored portion
(especially 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
available on the market.
Thicknesses of Annealed Copper Pipes (R410A)
Pipe outside diameter [in. (mm)] Thickness [in. (mm)]
1/4 (6.35) 0.032 (0.80)
3/8 (9.52) 0.032 (0.80)
1/2 (12.70) 0.032 (0.80)
5/8 (15.88) 0.039 (1.00)
3/4 (19.05) 0.047 (1.20)
4.2. Pipe requirement
CAUTION
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.
CAUTION
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 248 °F (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 70-80 %, use heat insulation that is 19/32 in.
(15 mm) or thicker and if the expected humidity exceeds 80 %, use heat insulation
that is 25/32 in. (20 mm) or thicker. If heat insulation is used that is not as thick as
speci
fi 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 68 °F (20 °C)).
1
4.3. Flare connection (pipe connection)
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
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.
Check if [L] is fl ared uniformly and
is not cracked or scratched.
Die
Pipe
A
B
L
Pipe outside diameter
[in. (mm)]
Dimension A [in. (mm)]
0 (0)
Dimension B
-0.015 (-0.4)
[in. (mm)]
Flare tool for R410A,
clutch type
1/4 (6.35)
0 to 0.020
(0 to 0.5)
11/32 (9.1)
3/8 (9.52) 17/32 (13.2)
1/2 (12.70) 21/32 (16.6)
5/8 (15.88) 25/32 (19.7)
3/4 (19.05) 15/16 (24.0)
When using conventional (R22) 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 speci fi 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 [in. (mm)]
Width across flats
of Flare nut [in. (mm)]
1/4 (6.35) 21/32 (17)
3/8 (9.52) 7/8 (22)
1/2 (12.70) 1-1/32 (26)
5/8 (15.88) 1-5/32 (29)
3/4 (19.05) 1-13/32 (36)
3.3.3. Attach the drain hose
CAUTION
Insert the drain hose and drain cap into the drain port, making sure that it comes
in contact with the back of the drain port, and then mount it. If the drain hose is not
connected properly, leaking will occur.
• Wrap the insulation around the drain hose, making sure that there are no gaps.
• Attach the Insulation (Drain hose) to the drain hose.
Drain hose
Insulation (Drain hose)
(Accessories)
[For
1
Rear piping,
2
Right piping and
3
Bottom piping]
• The drain hose and drain cap are used as they are.
[For
4
Left bottom piping,
5
Left piping and
6
Center piping,
7
Left rear piping]
• Remove the drain cap and drain hose. Mount the drain cap and drain hose to the drain
port on its opposite side.
Left side
Right side
Drain cap
Drain hose
Drain cap
Drain hose
Insert the drain hose until it butts
against the drain port.
Insert the drain cap until it butts
against the drain port.
3.3.4. Cut-out for piping on front cover
[For 2 Right piping, 3 Bottom piping, 4 Left bottom piping and
5 Left piping]
• Use a metal shears or other cutting tool to cut along the groove in the plastic for the
piping that will coming out of the front cover.
For
2
Right piping
For
5
Left piping
For 4 Left bottom piping
For 3 Bottom piping
4. PIPE INSTALLATION
]
CAUTION
Be more careful that foreign matter (oil, water, etc.) does not enter the piping when
installing 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.
]1
4.1. Selecting the pipe material
CAUTION
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 0.04 oz./100 ft. (40 mg/10 m).
Width across
fl ats
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