Daikin FTX30NVJU Installation Manual

Also see for FTX30NVJU: Service manual Service manual Engineering data Operation manual

Contents

Daikin FTX30NVJU Installation Manual Manual pdf 9 page image

English■ 8Refrigerant Piping WorkWARNING• Do not apply mineral oil on flared part.• 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 the 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.1. Flaring the pipe end1) Cut the pipe end with a pipe cutter.2) Remove burrs with the cut surface facing downwardso 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.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 a torque wrench.2-1. 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 bender forbending.2-2. Selection of copper and heat insulation materialsWhen using commercial copper pipes and fittings, observe the following:• Insulation material: Polyethylene foamHeat transfer rate: 0.041 to 0.052W/mK (0.024 to 0.030Btu/fth°F (0.035 to0.045kcal/mh°C))Be sure to use insulation that is designed for use with HVAC Systems.• ACR Copper only.• Be sure to insulate both the gas and liquid piping and observe the insulation dimensions as below.• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.Piping size Minimum bend radius Piping thickness Thermal insulation size Thermal insulationthicknessGas side O.D. 5/8 inch(15.9mm)1-15/16 inch (50mm)or more0.039 inch (1.0mm)(C1220T-O)I.D. 5/8-13/16 inch(16-20mm) 13/32 inch(10mm) Min.Liquid side O.D. 1/4 inch(6.4mm)1-3/16 inch (30mm)or more0.031 inch (0.8mm)(C1220T-O)I.D. 5/16-13/32 inch(8-10mm)AAFlaringSet exactly at the position shown below.Die 0-0.020 inch(0-0.5mm)Clutch-typeFlare tool forR410A0.039-0.059 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 toolThe flare’s inner surface must beflaw-free.The pipe end must be evenly flaredin a perfect circle.Make sure that the flare nut is fitted.CheckCut exactly atright angles. Remove burrs.Do not apply refrigerationoil to the outer surface.Flare nutApply refrigerationoil only to the innersurface of the flare.Do not apply refrigerationoil to the flare nut to avoidtightening with excessivetorque.Apply oilTorque wrenchPiping unionFlare nutSpannerTightenPiping sizeO.D. 5/8 inch(15.9mm)Gas sideLiquid side O.D. 1/4 inch(6.4mm)Flare nut tighteningtorque45-5/8–55-5/8ft • lbf(61.8-75.4N • m)10-1/2–12-3/4ft • lbf(14.2-17.2N • m)WallIf no flare cap isavailable, cover theflare mouth withtape to keep dirtand water out.RainBe sure toplace a cap.Gas pipe Liquid pipeGas pipeinsulationLiquid pipeinsulationFinishing tape Drain hose

/ 12

Related manuals for Daikin FTX30NVJU