Daikin VKM50GMV1 Installation Manual

Contents

Daikin VKM50GMV1 Installation Manual Manual pdf 9 page image

English 7Table 1• When connecting the flare nut, coat the flare section (bothinside and outside) with ester oil or ether oil, rotate three orfour times first, then screw in. (Refer to Fig. 12)• Refer to the “Table 1” for tightening torque.CAUTIONOver-tightening may damage the flare and cause arefrigerant leakage.• If a torque wrench is not available, tighten the nut in the fol-lowing manner. Once work is complete, make sure there isno gas leaking. As the flare nut is tightened with the wrench,the torque will suddenly increase. From that position, tightenthe nut to the angle shown on “ Table 2 ”.Table 2• After the work is finished, make sure to check that there is nogas leak.• After checking the pipe-connection for gas leakage, be sureto insulate the liquid and gas piping. (Refer to Fig. 13)CAUTIONBe sure to insulate any field piping all the way to the pipingconnection inside the unit. Any exposed piping may causecondensation or burns if touched.• Connect refrigerant piping and branching according to theattached installation manuals that come with the outdoor unit.• When brazing the refrigerant piping, perform nitrogenreplacement first, or perform the brazing (note 2) whilefeeding nitrogen into the refrigerant piping (note 1), andfinally connect the indoor unit using the flare connections.(Refer to Fig. 14)CAUTION• When brazing a pipe while feeding nitrogen inside the pipe,make sure to set the nitrogen pressure to 0.02 MPa(0.2 kg/cm2) or less using the pressure reducing valve.(This pressure is such that breeze is blown to your cheek.)• Do not use a flux when brazing the refrigerant pipe joints.Use phosphor copper brazer (BCuP-2: JIS Z 3264/B-Cu93P-710/795: ISO 3677) which does not require flux.(Using a flux containing chlorine may cause the piping tocorrode. Using a welding flux containing fluorine maycause the refrigerant lubricant to deteriorate, and affectadversely the refrigerant piping system.)• Do not use anti-oxidants or other similar agent when braz-ing the pipe joints.Residue can clog the pipes and may cause breakdown ofparts.8 DUCT CONNECTION〈〈〈〈Perform duct work keeping the following things in mind〉〉〉〉• Do not connect the ducts as shown in Fig. 15.• The minimal radius of bends for flexible ducts are as follows.200-mm duct : 300 mm diameter250-mm duct : 375 mm diameter• To prevent air leakage, wind aluminum tape round the sec-tion after the duct connecting flange and the duct are con-nected. (Refer to Fig. 16)• To prevent short circuit, install the opening of the indoor airintake as far as from the opening of the exhaust suction.Pipegauge Tightening torque Flare dimen-sion A (mm) Flare shapeφ 6.4 14.2–17.2 N·m 8.7 – 9.1φ12.7 49.5–60.3 N·m 16.2 – 16.6Pipe size Further tightening angle Recommended armlength of toolφ 6.4 (1/4”) 60 to 90 degrees Approx. 150mmφ 12.7 (1/2”) 30 to 60 degrees Approx. 250mmA45020R0.4-0.890 02 0Torque wrenchSpannerPiping unionFlare nutFig. 11Ester oil or ether oilFig. 12Gas Piping Insulation ProcedureLiquid Piping Insulation ProcedureClamp(accessory)Clamp(accessory)Flare nutconnectionPiping insulation material(locally procured)Flare nutconnectionTurn seams up Mid sealing padWrap over thetop of the flarenut connection.(accessory)Turn seams upPiping insulationmaterial(Locally procured)Piping insulationmaterial(main unit)Piping insulationmaterial(main unit)Attach to baseAttach to baseMain unitMain unitInsulation for fitting(accessory)Insulation for fitting(accessory)Gas pipeLiquidpipeFig. 13Model Gas pipingdiameterLiquid pipingdiameterVKM50GMV1, VKM50GV1VKM80GMV1, VKM80GV1VKM100GMV1, VKM100GV1φ 12.7 φ 6.4Refrigerant pipingPart to bebrazed TapingPressure-reducing valvehandsvalve NitrogenNitrogenFig. 14(a) Exterme bend (b) Multi bend (d) a bend rightnext to theoutlet(Do not reduce the ductdiameter halfway.)(c) Reduce thediameter of theduct to beconnected.Fig. 15(Do not bend theduct over 90˚)