Daikin FDA125A5VEB Installer And User Reference Manual

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Daikin FDA125A5VEB Installer And User Reference Manual Manual pdf 14 page image

6 InstallationInstaller and user reference guide14FDA125A5VEBSplit system air conditioners4P495031-1A – 2019.03When electrical wiring is finished already1 Start cooling operation (see "8.3 To perform a test run" onpage 18).2 Gradually pour approximately 1 l of water through the airdischarge outlet, and check for leaks (see "When electricalwiring is not finished yet" on page 13).6.3 Connecting the refrigerant piping6.3.1 About connecting the refrigerant pipingBefore connecting the refrigerant pipingMake sure the outdoor and indoor unit are mounted.Typical workflowConnecting the refrigerant piping involves:▪ Connecting the refrigerant piping to the outdoor unit▪ Connecting the refrigerant piping to the indoor unit▪ Insulating the refrigerant piping▪ 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 when adding refrigerant. Referto the outdoor unit specifications for the type ofrefrigerant to be used.▪ Only use installation tools (e.g. manifold gauge set) thatare exclusively used for R32 or R410A 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).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)Ø9.5 33~39 12.8~13.2R=0.4~0.845°±290°±2AØ15.9 63~75 19.3~19.76.3.4 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).