Fujitsu ASYA18L User Manual

En-6
4. PIPE INSTALLATION
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CAUTION
•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.
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4.1. Selecting the pipe material
CAUTION
•Donotuseexistingpipes.
•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 (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 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.)] Thickness [mm]
6.35 (1/4) 0.80
9.52 (3/8) 0.80
12.70 (1/2) 0.80
15.88 (5/8) 1.00
19.05 (3/4) 1.20
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4.2. Pipe requirement
CAUTION
•Refer to the Installation Manual of the outdoor unit
for description of the length of connecting pipe or for
difference of its elevation.
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 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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speci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).
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4.3. Flare connection (pipe connection)
4.3.1. Flaring
• Usespecialpipecutterand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arenut(alwaysusethearenutattachedto
the indoor and outdoor units respectively) onto the pipe
andperformtheareprocessingwithaaretool.Usethe
specialR410Aaretool,ortheconventionalaretool.
Leakageofrefrigerantmayresultifother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areduniformly
and is not cracked or scratched.
Die
Pipe
A
B
L
Pipe outside
diameter
[mm (in.)]
Dimension A [mm]
Dimension B
-
0
0.4
[mm]
Flare tool for R410A,
clutch type
6.35 (1/4)
0 to 0.5
9.1
9.52 (3/8) 13.2
12.70 (1/2) 16.6
15.88 (5/8) 19.7
19.05 (3/4) 24.0
WhenusingconventionalaretoolstoareR410Apipes,
thedimensionAshouldbeapproximately0.5mmmore
thanindicatedinthetable(foraringwithR410Aaretools)
toachievethespeciedaring.Useathicknessgaugeto
measure the dimension A.
Pipe outside
diameter [mm (in.)]
Width across flats
of Flare nut [mm]
6.35 (1/4) 17
9.52 (3/8) 22
12.70 (1/2) 26
15.88 (5/8) 29
19.05 (3/4) 36
Width across
ats
9371057033-02_IM_en.indd 6 2/20/2009 3:13:28 PM

Fujitsu ASYA18L Specifications

General

Brand	Fujitsu
Model	ASYA18L
Category	Air Conditioner
Language	English