Installation manual

11 ■English
Refrigerant Piping Work
2. Refrigerant piping
CAUTION
•Usethearenutxedtothemainunit.(Topreventcrackingofthearenutbyageddeterioration.)
•Topreventgasleakage,applyrefrigerationoilonlytotheinnersurfaceoftheare.(UserefrigerationoilforR410A.)
•Usetorquewrencheswhentighteningthearenutstopreventdamagetothearenutsandgasleakage.
Alignthecentresofbotharesandtightenthearenuts3or4turnsbyhand.Thentightenthemfullywiththetorquewrenches.
Do not apply refrigeration
oil to the outer surface.
Flare nut
Apply refrigeration oil to
the inner surface of the
flare.
Do not apply refrigeration oil to
the flare nut to avoid tightening
with excessive torque.
[Apply oil]
Torque wrench
Piping union
Flare nut
Spanner
[Tighten]
Flare nut tightening torque
Gas side Liquid side
3/8 inch 1/4 inch
32.7-39.9N • m
(330-407kgf • cm)
14.2-17.2N • m
(144-175kgf • cm)
2-1. Caution on piping handling
1)Protecttheopenendofthepipeagainstdustandmoisture.
2)Allpipebendsshouldbeasgentleaspossible.Useapipebender
forbending.
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
2-2. Selection of copper and heat insulation materials
•Whenusingcommercialcopperpipesandttings,observethefollowing:
1)Insulationmaterial:Polyethylenefoam
Heattransferrate:0.041to0.052W/mK(0.035to0.045kcal/mh°C)
Refrigerantgaspipe’ssurfacetemperaturereaches110°Cmax.
Chooseheatinsulationmaterialsthatwillwithstandthistemperature.
2)Besuretoinsulateboththegasandliquidpipingandtoprovide
insulationdimensionsasbelow.
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wire
Gasside Liquidside
Gaspipethermal
insulation
Liquidpipethermal
insulation
O.D.9.5mm O.D.6.4mm I.D.12-15mm I.D.8-10mm
Minimumbendradius Thickness10mmMin.
30mmormore
Thickness0.8mm(C1220T-O)
3)Useseparatethermalinsulationpipesforgasandliquidrefrigerantpipes.
01_EN_3P297034-1.indd 11 10/12/2011 11:37:08 AM