Daikin FTXZ25NV1B Installation Manual

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Daikin FTXZ25NV1B Installation Manual Manual pdf 15 page image

1313Outdoor Unit Installation4. Refrigerant pipingCAUTION• Use the fl are nut fi xed to the main unit. (To prevent cracking of the fl are nut by aged deterioration.)• To prevent gas leakage, apply refrigeration oil only to the inner surface of the fl are. (Use refrigeration oil for R32.)• Use torque wrenches when tightening the fl are nuts to prevent damage to the fl are nuts and gas leakage.• Align the centres of both fl ares and tighten the fl are nuts 3 or 4 turns by hand. Then tighten them fully with the torque wrenches.• Refrigerant oil for R410A can also be used for application to the inner fl are.Flare nut tightening torqueGas side Liquid side9.5mm 6.4mm32.7-39.9N · m(333-407kgf · cm)14.2-17.2N · m(144-175kgf · cm)Valve cap tightening torqueGas side Liquid side9.5mm 6.4mm21.6-27.4N · m(220-280kgf · cm)Service port cap tightening torque10.8-14.7N · m (110-150kgf · cm)Torque wrenchFlare nutApply refrigerationoil to the innersurface of thefl are.Do not applyrefrigeration oil tothe outer surface.Flare nutfl are.Do not apply refrigeration oil tothe fl are nut to avoid tighteningwith excessive torque.Apply oil TightenFlare nutPiping unionPiping unionSpanner5. Refrigerant piping work5-1 Cautions on pipe handling• Protect the open end of the pipe against dust and moisture.• All pipe bends should be as gentle as possible. Use a pipebender for bending.Be sure to place a cap.If no fl are cap isavailable, cover thefl are mouth with tapeto keep dirt or waterout.RainWall5-2 Selection of copper and heat insulation materialsWhen using commercial copper pipes and fi ttings, observe the following:• Insulation material: Polyethylene foamHeat 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.• Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.Seal the edge of the insulationif there is a possibility that thecondensation from the stop valvemight drip onto the indoor unitthrough the gap between theinsulation and the pipe.Inter-unit wireG Humidifying hoseFinishing tapeLiquid pipe insulationLiquid pipeGas pipeGas pipe insulationPiping bundle diagramGas side Liquid side Gas pipe thermal insulation Liquid pipe thermalinsulationO.D. 9.5mm O.D. 6.4mm I.D. 12-15mm I.D. 8-10mmMinimum bend radius Thickness 10mm Min.30mm or moreThickness 0.8mm (C1220T-O)• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.