Daikin FCAG35AVEB Installer And User Reference Manual

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Daikin FCAG35AVEB Installer And User Reference Manual Manual pdf 17 page image

6 InstallationInstaller and user reference guide17FCAG35~140AVEBSplit system air conditioners4P473927-1 – 2017.036.3.6 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.▪ Set the nitrogen pressure to 20 kPa (0.2 bar) (just enough so itcan be felt on the skin) with a pressure-reducing valve.a b c d effa Refrigerant pipingb Part to be brazedc Tapingd Manual valvee Pressure-reducing valvef Nitrogen▪ Do NOT use anti-oxidants when brazing pipe joints.Residue can clog pipes and break equipment.▪ Do NOT use flux when brazing copper-to-copper refrigerantpiping. Use phosphor copper brazing filler alloy (BCuP), whichdoes not require flux.Flux has an extremely harmful influence on refrigerant pipingsystems. For instance, if chlorine based flux is used, it will causepipe corrosion or, in particular, if the flux contains fluorine, it willdeteriorate the refrigerant oil.6.3.7 To connect the refrigerant piping to theindoor unitWARNING: FLAMMABLE MATERIALThe R32 refrigerant (if applicable) in this unit is mildlyflammable.2▪ Pipe length. Keep refrigerant piping as short as possible.▪ Flare connections. Connect refrigerant piping to the unit usingflare connections.▪ Insulation. Insulate the refrigerant piping on the indoor unit asfollows:A Ba dc e fb b a dc e fb b243 g 1 23 4gAB1A Gas pipingB Liquid pipinga Insulation material (field supply)b Cable tie (accessory)c Insulation pieces: Large (gas pipe), small (liquid pipe)(accessories)d Flare nut (attached to the unit)e Refrigerant pipe connection (attached to the unit)f Unitg Sealing pads: Medium 1 (gas pipe), medium 2 (liquid pipe)(accessories)1 Turn up the seams of the insulation pieces.2 Attach to the base of the unit.3 Tighten the cable ties on the insulation pieces.4 Wrap the sealing pad from the base of the unit to the top ofthe flare nut.NOTICEMake sure to insulate all refrigerant piping. Any exposedpiping might cause condensation.6.4 Connecting the electrical wiring6.4.1 About connecting the electrical wiringTypical workflowConnecting the electrical wiring typically consists of the followingstages:1 Making sure the power supply system complies with theelectrical specifications of the units.2 Connecting the electrical wiring to the outdoor unit.3 Connecting the electrical wiring to the indoor unit.4 Connecting the main power supply.6.4.2 Precautions when connecting theelectrical wiringINFORMATIONAlso read the precautions and requirements in thefollowing chapters:▪ General safety precautions▪ PreparationDANGER: RISK OF ELECTROCUTIONWARNINGALWAYS use multicore cable for power supply cables.WARNINGIf the supply cord is damaged, it must be replaced by themanufacturer, its service agent or similarly qualifiedpersons in order to avoid a hazard.6.4.3 Guidelines when connecting the electricalwiringKeep the following in mind:▪ If stranded conductor wires are being used, install a round crimp-style terminal on the tip. Place the round crimp-style terminal onthe wire up to the covered part and fasten the terminal with theappropriate tool.b aa Stranded conductor wireb Round crimp-style terminal▪ Use the following methods for installing wires:(2) Refer to the outdoor unit specifications for the type of refrigerant to be used.