Daikin FTX09NMVJU Installation Manual

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Contents

Daikin FTX09NMVJU Installation Manual Manual pdf 10 page image

9 ■EnglishRefrigerant Piping Work1� Flaring the pipe end1) Cut the pipe end with a pipe cutter.2) Remove burrs with the cut surface facing downward,so that the filings do not enter the pipe.3) Put the flare nut on the pipe.4) Flare the pipe.5) Check that the flaring has been done correctly.Set exactly at the position shown below.FlaringAA 0-0.020 inch(0-0.5mm)Clutch-typeFlare tool for R410A0.039-0.059 inch(1.0-1.5mm)Clutch-type (Rigid-type)0.059-0.079 inch(1.5-2.0mm)Wing-nut type (Imperial-type)Conventional flare toolRemove burrs.Cut exactly atright angles.CheckThe flare's innersurface must beflaw-free.The pipe end mustbe evenly flared ina perfect circle.Make sure that theflare nut is fitted.DieWARNING• Do not apply mineral oil to the flare.• Prevent mineral oil from getting into the system as this would reduce the service life of the units.• Never use piping which has been used for previous installations. Only use parts which are delivered with this unit.• Never install a dryer to this R410A unit in order to guarantee its service life.• The drying material may dissolve and damage the system.• Incomplete flaring may result in refrigerant gas leakage.2� Refrigerant pipingCAUTION• Use the flare nut fixed to the main unit. (This is to prevent the flare nut from cracking as a result of deterioration over time.)• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)• Use a torque wrench when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.• Align the centers of both flares and tighten the flare nuts 3 or 4 turns by hand, then tighten them fully with a spanner and atorque wrench.Do not apply refrigerationoil to the outer surface.Flare nutApply refrigerationoil to the innersurface of the flare.Do not apply refrigeration oil tothe flare nut to avoid tighteningwith excessive torque.Apply oilTorque wrenchPiping unionFlare nutSpannerTightenGas sidePiping sizeO.D. 3/8 inch(9.5mm)O.D. 1/2 inch(12.7mm)O.D. 5/8 inch(15.9mm)O.D. 1/4 inch(6.4mm)24-1/8 – 29-1/2ft • Ibf(32.7-39.9N • m)36-1/2 – 44-1/2ft • lbf(49.5-60.3N • m)45-5/8 – 55-5/8ft • Ibf(61.8-75.4N • m)10-1/2 – 12-3/4ft • lbf(14.2-17.2 N • m)Flare nut tightening torqueLiquid side2-1� Caution on piping handling• Protect the open end of the pipe against dust and moisture.• All pipe bends should be as gentle as possible. Use a pipe benderfor bending.WallIf no flare cap isavailable, coverthe flare mouthwith tape to keepdirt and water out.Be sure toplace a cap.Rain