Daikin RX20JV1B Installation Manual

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Daikin RX20JV1B Installation Manual Manual pdf 7 page image

5 nEnglishOutdoor Unit Installation3. Flaring the pipe end.1) Cut the pipe end with a pipe cutter.2) Remove burrs with the cut surface facing down-ward so that the chips do not enter the pipe.3) Put the flare nut on the pipe.4) Flare the pipe.5) Check that the flaring is properly made.WARNING1) Do not use mineral oil on flared part.2) Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.3) Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.4) Do never install a drier to this R410A unit in order to guarantee its lifetime.5) The drying material may dissolve and damage the system.6) Incomplete flaring may cause refrigerant gas leakage.4. Refrigerant piping.CAUTION1) Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)2) To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)3) Use torque wrenches when tightening the flare nuts to prevent damage to the flare nuts and gas leakage.Align the centres of both flares and tighten the flare nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.(Cut exactly atright angles.) Remove burrsSet exactly at the position shown below.AFlaringDieCheckFlare’s innersurface mustbe flaw-free.The pipe end mustbe evenly flared ina perfect circle.Make sure that theflare nut is fitted.A 0-0.5mmClutch-typeFlare tool for R410A1.0-1.5mmClutch-type (Rigid-type)1.5-2.0mmWing-nut type (Imperial-type)Conventional flare toolFlare nut tightening torqueGas side Liquid side3/8 inch 1/4 inch32.7-39.9N m 14.2-17.2N m(333-407kgf cm) (144-175kgf cm)Valve cap tightening torqueGas side Liquid side3/8 inch 1/4 inch21.6-27.4N m 21.6-27.4N m(220-280kgf cm) (220-280kgf cm)Service port cap 10.8~14.7N mtightening torque (110~150kgf cm)Torque wrenchPiping unionFlare nutDo not apply refrigerationoil to the outer surface.Flare nutApply refrigeration oil tothe inner surface of theflare.Do not apply refrigerationoil to the flare nut avoidtightening with over torque.Spanner[Apply oil] [Tighten]