Fujitsu ARXC36L - Pipe Requirement; Flare Connection (Pipe Connection)

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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.
L
Checkif[L]isareduniformly
and is not cracked or scratched.
Die
Pipe
A
B
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
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difculttobendorstretchthemany
more.Donotbendorstretchthepipesmorethanthree
times.
CAUTION
•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
Whenthearenutistightenedproperlybyyourhand,
hold the body side coupling with a separate spanner, then
tighten with a torque wrench.
CAUTION
•Holdthetorquewrenchatitsgrip,keepingitintheright
angle with the pipe, in order to tighten the flare nut
correctly.
•Tighten the flare nuts with a torque wrench using the
specified tightening method. Otherwise, the flare nuts
could break after a prolonged period, causing refrigerant
to leak and generate a hazardous gas if the refrigerant
comesintocontactwithaame.
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Tighten with two wrenches.
Holding wrench
Flare nut
CAUTION
•Besuretoapplythepipeagainsttheportontheindoor
unit and the outdoor unit correctly. If the centering is
improper, the flare nut cannot be tightened smoothly.
If the flare nut is forced to turn, the threads will be
damaged.
•Donotremovethearenutfromtheindoorunitpipeuntil
immediately before connecting the connection pipe.
•Do not use mineral oil on flared part. Prevent mineral
oil from getting into the system as this would reduce the
lifetime of the units.
Width across
ats
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