Daikin FTXN15KVJU Installation Manual

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Daikin FTXN15KVJU Installation Manual Manual pdf 8 page image

■English 7English2. Refrigerant pipingCAUTION• Use the flare nut fixed to the main unit. (To prevent cracking of the flare nut by aged deterioration.)• To prevent gas leakage, apply refrigeration oil only to the inner surface of the flare. (Use refrigeration oil for R410A.)• Use torque wrenches 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 the torquewrenches.2-1. Caution on piping handling1) Protect the open end of the pipe against dust and moisture.2) All pipe bends should be as gentle as possible. Use a pipe benderfor bending.2-2. Selection of copper and heat insulation materials• When using commercial copper pipes and fittings, observe the following:1) 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))Refrigerant gas pipe’s surface temperature reaches 230°F (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 insulationdimensions as below.3) Use separate thermal insulation pipes for gas and liquid refrigerant pipes.Gas side Liquid side Gas pipe thermalinsulationLiquid pipe thermalinsulationO.D. 1/2 inch (12.7mm) O.D. 1/4 inch (6.4mm) I.D. 0.551-0.630 inch(14-16mm)I.D. 0.315-0.393 inch(8-10mm)Minimum bend radius Thickness 0.393 inch (10mm) Min.1-9/16 inch (40mm) or more 1-3/16 inch (30mm) or moreThickness 0.031 inch (0.8mm) (C1220T-O)Do 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.[Apply oil]Torque wrenchPiping unionFlare nutSpanner[Tighten]Flare nut tightening torqueGas side Liquid side1/4 inch (6.4mm)36.5-44.5ft • lbf(49.5-60.3N • m)10.4-12.7ft lbf(14.2-17.2N m)1/2 inch (12.7 mm)WallIf no flare cap isavailable, coverthe flare mouthwith tape to keepdirt or water out.Be sure toplace a cap.RainGas pipe Liquid pipeGas pipeinsulationLiquid pipeinsulationFinishing tape Drain hoseInter-unit wire