Daikin FDXM25F3V1B Installer's Reference Manual

Also see for FDXM25F3V1B: Installer's reference guide Operation manual

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Daikin FDXM25F3V1B Installer's Reference Manual Manual pdf 12 page image

6 InstallationInstaller reference guide12FDXM25~60F3V1BSplit system air conditioners4P482333-1 – 2017.03▪ Keeping in mind the guidelines for:▪ Pipe bending▪ Flaring pipe ends▪ Brazing▪ Using the stop valves6.3.2 Precautions when connecting therefrigerant pipingINFORMATIONAlso read the precautions and requirements in thefollowing chapters:▪ General safety precautions▪ PreparationDANGER: RISK OF BURNINGCAUTION▪ Do NOT use mineral oil on flared part.▪ NEVER install a drier to this unit to guarantee itslifetime. The drying material may dissolve and damagethe system.NOTICETake 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 or R410A(a) when adding refrigerant.▪ Only use installation tools (e.g. manifold gauge set) thatare exclusively used for R32 or R410A(a) installations towithstand the pressure and to prevent foreign materials(e.g. mineral oils and moisture) from mixing into thesystem.▪ 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).Refer to the outdoor unit specifications for the type ofrefrigerant to be used.(a) Refer to the outdoor unit specifications for the type ofrefrigerant to be used.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.6.3.3 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 2 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)Ø6.4 15~17 8.7~9.1R=0.4~0.845°±290°±2AØ9.5 33~39 12.8~13.2Ø12.7 50~60 16.2~16.66.3.4 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).6.3.5 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 down 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.A