Indoor Installation Manual

5
4. Installingtherefrigerantpiping
4.1.Precautions
FordevicesthatuseR410Arefrigerant
• Use alkylbenzeneoil(small amount)asthe refrigerationoilapplied tothe
aredsections.
• UseC1220copperphosphorusforcopperandcopperalloyseamlesspipes,
to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
speciedinthetablebelow. Makesuretheinsidesof thepipesareclean
and do not contain any harmful contaminants such as sulfuric compounds,
oxidants,debris,ordust.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
speciedrefrigerant(R410A)tochargetherefrigerantlines.Donotmixitwith
any other refrigerant and do not allow air to remain in the lines.
Ifairismixedwiththerefrigerant,thenitcanbethecauseofabnormalhigh
pressureintherefrigerantline,andmayresultinanexplosionandotherhazards.
Theuseofanyrefrigerantotherthanthatspeciedforthesystemwillcause
mechanical failure or system malfunction or unit breakdown. In the worst case,
this could lead to a serious impediment to securing product safety.
ø6.35mm,ø1/4inch
thickness0.8mm,1/32inch
ø9.52mm,ø3/8inch
thickness0.8mm,1/32inch
ø12.7mm,ø1/2inch
thickness0.8mm,1/32inch
ø15.88mm,ø5/8inch
thickness1.0mm,3/64inch
• Donotusepipesthinnerthanthosespeciedabove.
4.2.Connectingpipes(Fig.4-1)
• Whencommerciallyavailablecopperpipesareused,wrapliquidandgaspipes
with commercially available insulation materials (heat-resistant to 100 °C, 212 °F
ormore,thicknessof12mm,1/2inchormore).
• Applythinlayerofrefrigerantoiltopipeandjointseatingsurfacebeforetightening
arenut.
• Use2wrenchestotightenpipingconnections.
• Userefrigerantpipinginsulationprovidedtoinsulateindoorunitconnections.Insulate
carefully.
• Afterconnectingtherefrigerantpipingtotheindoorunit,besuretotestthepipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
• Usearednutinstalledtothisindoorunit.
• Incaseofreconnectingtherefrigerantpipesafterdetaching,makethearedpart
of pipe re-fabricated.
B Flare nut tightening torque
Copper pipe O.D.
(mm, inch)
Flare nut O.D.
(mm, inch)
Tightening torque
(N·m, ft·lbs)
ø6.35,1/4" 17,43/64" 14-18,10-13"
ø6.35,1/4" 22,7/8" 34-42,25-30"
ø9.52,3/8" 22,7/8" 34-42,25-30"
ø12.7,1/2" 26,1-3/32" 49-61,35-44"
ø15.88,5/8" 29,1-9/64" 68-82,49-59"
CApplyrefrigeratingmachineoilovertheentireareseatsurface.
DUsecorrectarenutsmeetingthepipesizeoftheoutdoorunit.
Availablepipesize
A12, A18 A24, A30, A36, A42
Liquid side
ø6.35
Ο
–
–
ø9.52
Ο
Gas side [12.7Ο [15.88Ο
Ο:Factoryarenutattachmenttotheheatexchanger.
Warning:
• Becarefulofyingarenut!(Internallypressurized)
 Removethearenutasfollows:
1. Loosen the nut until you hear a hissing noise.
2. Do not remove the nut until the gas has been completely released (i.e.,
hissing noise stops).
 3. Checkthatthegashasbeencompletelyreleased,andthenremovethe
nut.
• When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
A Flare cutting dimensions
Copper pipe O.D.
(mm, inch)
Flare dimensions
[A dimensions (mm, inch)
[6.35,1/4" 8.7-9.1,11/32-23/64"
[9.52,3/8" 12.8-13.2,1/2-33/64"
[12.7,1/2" 16.2-16.6,41/64-21/32"
[15.88,5/8" 19.3-19.7,49-64-25/32"
Fig.4-2
Fig.4-1
A B
C
D
A
B
E
F
Copper pipe O.D.
(mm, inch)
B (mm, inch)
Flare tool for R410A
Clutch type
[6.35(1/4”) 1-1.5,3/64-1/16"
[9.52(3/8”) 1-1.5,3/64-1/16"
[12.7(1/2”) 1-1.5,3/64-1/16"
[15.88(5/8”) 1-1.5,3/64-1/16"
R1/64
to

R1/32
45°± 2°
90°± 0.5°
E Die
F Copper pipe
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