Daikin FNA25A2VEB Installer's Reference Manual

Also see for FNA25A2VEB: Installation manual Operation manual Installer's reference guide

Contents

6 InstallationInstaller reference guide10FNA25~60A2VEBSplit system air conditioners4P482940-1 – 2017.065.3 Preparing refrigerant piping5.3.1 Refrigerant piping requirementsINFORMATIONAlso read the precautions and requirements in the"General safety precautions" chapter.Refrigerant piping material▪ Piping material: Phosphoric acid deoxidised seamless copper.▪ Piping temper grade and thickness:Outer diameter(Ø)Temper grade Thickness (t)(a)6.4 mm (1/4") Annealed (O) ≥0.8 mmtØ9.5 mm (3/8")12.7 mm (1/2")(a) Depending on the applicable legislation and the unit'smaximum working pressure (see "PS High" on the unitname plate), larger piping thickness might be required.Refrigerant piping diameterUse the same diameters as the connections on the outdoor units:Class L1 liquid piping L1 gas piping25/35 Ø6.4 Ø9.550/60 Ø6.4 Ø12.75.3.2 Refrigerant piping insulation▪ Use polyethylene foam as insulation material:▪ with a heat transfer rate between 0.041 and 0.052 W/mK (0.035and 0.045 kcal/mh°C)▪ with a heat resistance of at least 120°C▪ Insulation thicknessPipe outer diameter(Øp)Insulation innerdiameter (Øi)Insulation thickness(t)6.4 mm (1/4") 8~10 mm ≥10 mm9.5 mm (3/8") 12~15 mm12.7 mm (1/2") 14~16 mmØiØitØpØpIf the temperature is higher than 30°C and the humidity is higherthan RH 80%, the thickness of the insulation materials should be atleast 20 mm to prevent condensation on the surface of theinsulation.5.4 Preparing electrical wiring5.4.1 About preparing electrical wiringINFORMATIONAlso read the precautions and requirements in the"General safety precautions" chapter.WARNING▪ If the power supply has a missing or wrong N-phase,equipment might break down.▪ Establish proper earthing. Do NOT earth the unit to autility pipe, surge absorber, or telephone earth.Incomplete earthing may cause electrical shock.▪ Install the required fuses or circuit breakers.▪ Secure the electrical wiring with cable ties so that thecables do NOT come in contact with sharp edges orpiping, particularly on the high-pressure side.▪ Do NOT use taped wires, stranded conductor wires,extension cords, or connections from a star system.They can cause overheating, electrical shock or fire.▪ Do NOT install a phase advancing capacitor, becausethis unit is equipped with an inverter. A phaseadvancing capacitor will reduce performance and maycause accidents.WARNING▪ All wiring must be performed by an authorisedelectrician and must comply with the applicablelegislation.▪ Make electrical connections to the fixed wiring.▪ All components procured on the site and all electricalconstruction must comply with the applicablelegislation.WARNINGALWAYS use multicore cable for power supply cables.6 Installation6.1 Overview: InstallationThis chapter describes what you have to do and know on-site toinstall the system.Typical workflowInstallation typically consists of the following stages:▪ Mounting the outdoor unit.▪ Mounting the indoor unit.▪ Connecting the refrigerant piping.▪ Checking the refrigerant piping.▪ Charging refrigerant.▪ Connecting the electrical wiring.▪ Finishing the outdoor installation.▪ Finishing the indoor installation.6.2 Mounting the indoor unit6.2.1 Precautions when mounting the indoorunitINFORMATIONAlso read the precautions and requirements in thefollowing chapters:▪ General safety precautions▪ Preparation