Installation Manual SiMT041311E69 Installation / Operation Manual13Outdoor Unit Installation4. Refrigerant pipingCAUTIONFlare nut tightening torqueGas side Liquid side9.5mm 6.4mmValve cap tightening torqueGas side Liquid side9.5mm 6.4mmService port cap tightening torque10.8-14.7N · m (110-150kgf · cm)Torque wrenchFlare nutFlare nutApply oil TightenSpanner5. Refrigerant piping work5-1 Cautions on pipe handlingBe sure to place a cap.RainWall5-2 Selection of copper and heat insulation materialsInter-unit wireG Humidifying hoseFinishing tapeLiquid pipe insulationLiquid pipeGas pipeGas pipe insulationPiping bundle diagramGas side Liquid side Gas pipe thermal insulationO.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.• 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 R32.)• 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.• Refrigerant oil for R410A can also be used for application to the inner flare.Do not applyrefrigeration oil tothe outer surface.Apply refrigerationoil to the innersurface of theflare.Do not apply refrigeration oil tothe flare nut to avoid tighteningwith excessive torque.Piping union32.7-39.9N · m(333-407kgf · cm)14.2-17.2N · m(144-175kgf · cm)21.6-27.4N · m(220-280kgf · cm)If no flare cap isavailable, cover theflare mouth with tapeto keep dirt or waterout.• 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.When using commercial copper pipes and fittings, 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 stopvalve might drip onto the indoorunit through the gap betweenthe insulation and the pipe.Liquid pipe thermalinsulation
