Daikin RZAG71L7V1B Reference Manual

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Daikin RZAG71L7V1B Reference Manual Manual pdf 13 page image

6 InstallationInstaller reference guide13RZAG71~140L7V1BSplit system air conditioners4P418663-1 – 2016.02NOTICETake the following precautions on refrigerant piping intoaccount:▪ Avoid anything but the designated refrigerant to getmixed into the refrigerant cycle (e.g. air).▪ Only use R32 when adding refrigerant.▪ Only use installation tools (e.g. manifold gauge set) thatare exclusively used for R32 installations to withstandthe pressure and to prevent foreign materials (e.g.mineral oils and moisture) from mixing into the system.▪ Install the piping so that the flare is NOT subjected tomechanical stress.▪ Protect the piping as described in the following table toprevent dirt, liquid or dust from entering the piping.▪ Use caution when passing copper tubes through walls(see figure below).Unit Installation period Protection methodOutdoor unit >1 month Pinch the pipe<1 month Pinch or tape the pipeIndoor unit Regardless of theperiodINFORMATIONDo NOT open the refrigerant stop valve before checkingthe refrigerant piping. When you need to charge additionalrefrigerant it is recommended to open the refrigerant stopvalve after charging.6.4.3 Guidelines when connecting therefrigerant pipingTake the following guidelines into account when connecting pipes:▪ Coat the flare inner surface with ether oil or ester oil whenconnecting a flare nut. Tighten 3 or 4 turns by hand, beforetightening firmly.▪ Always use two wrenches together when loosening a flare nut.▪ Always use a spanner and torque wrench together to tighten theflare nut when connecting the piping. This to prevent nut crackingand leaks.a bcda Torque wrenchb Spannerc Piping uniond Flare nutPiping size(mm)Tighteningtorque (N•m)Flaredimensions (A)(mm)Flare shape(mm)Ø9.5 33~39 12.8~13.2R=0.4~0.845°±290°±2AØ15.9 63~75 19.3~19.76.4.4 Pipe bending guidelinesUse a pipe bender for bending. All pipe bends should be as gentleas possible (bending radius should be 30~40 mm or larger).6.4.5 To flare the pipe endCAUTION▪ Incomplete flaring may cause refrigerant gas leakage.▪ Do NOT re-use flares. Use new flares to preventrefrigerant gas leakage.▪ Use flare nuts that are included with the unit. Usingdifferent flare nuts may cause refrigerant gas leakage.1 Cut the pipe end with a pipe cutter.2 Remove burrs with the cut surface facing downward so that thechips do not enter the pipe.a ba Cut exactly at right angles.b Remove burrs.3 Remove the flare nut from the stop valve and put the flare nuton the pipe.4 Flare the pipe. Set exactly at the position as shown in thefollowing illustration.AFlare tool for R32(clutch type)Conventional flare toolClutch type(Ridgid-type)Wing nut type(Imperial-type)A 0~0.5 mm 1.0~1.5 mm 1.5~2.0 mm5 Check that the flaring is properly made.a bca Flare’s inner surface must be flawless.b The pipe end must be evenly flared in a perfect circle.c Make sure the flare nut is fitted.{Jesse, 08/01/201611:59:21: 20160104: in past lifted, from now on fitted.Consulted Tim Coessens of Heating dept. and Jan vanOoteghem of AC dept., they confirm. Make EN no doubtful,the flare nut must be on the tube before connecting!}6.4.6 To braze the pipe endThe indoor unit and outdoor unit have flare connections. Connectboth ends without brazing. If brazing should be needed, take thefollowing into account:▪ When brazing, blow through with nitrogen to prevent creation oflarge quantities of oxidised film on the inside of the piping. Thisfilm adversely affects valves and compressors in the refrigeratingsystem and prevents proper operation.