Daikin VRV 5-S RXYSA8AMY1B Installation And Operation Manual

15 Piping installationInstallation and operation manual28RXYSA8~12AMY1BVRV 5-S system air conditioner4P752781-1B – 2024.0214.3.4 To prevent the outdoor unit from fallingoverIn case the unit is installed in places where strong wind can tilt theunit, take following measure:1 Prepare 2 cables as indicated in the following illustration (fieldsupply).2 Place the 2 cables over the outdoor unit.3 Insert a rubber sheet between the cables and the outdoor unitto prevent the cables from scratching the paint (field supply).4 Attach the ends of the cables.5 Tighten the cables.15 Piping installationCAUTIONSee "2 Specific installer safety instructions" [4 5] to makesure this installation complies with all safety regulations.15.1 Preparing refrigerant piping15.1.1 Refrigerant piping requirementsNOTICEThe piping and other pressure-containing parts shall besuitable for refrigerant. Use phosphoric acid deoxidisedseamless copper for refrigerant piping.▪ Foreign materials inside pipes (including oils for fabrication) mustbe ≤30 mg/10 m.15.1.2 Refrigerant piping material▪ Piping material: phosphoric acid deoxidised seamless copper▪ Flare connections: Only use annealed material.▪ Piping temper grade and thickness:Outer diameter(Ø)Temper grade Thickness (t)(a)6.4 mm (1/4")9.5 mm (3/8")12.7 mm (1/2")Annealed (O) ≥0.80 mmtØ15.9 mm (5/8") Annealed (O) ≥0.99 mm19.1 mm (3/4")22.2 mm (7/8")Half hard (1/2H) ≥0.80 mm25.4 mm (1") Half hard (1/2H) ≥0.88 mm(a) Depending on the applicable legislation and the maximumworking pressure of the unit (see "PS High" on the unit nameplate), larger piping thickness might be required.15.1.3 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 thickness:AmbienttemperatureHumidity Minimum thickness≤30°C 75% to 80% RH 15 mm>30°C ≥80% RH 20 mm15.1.4 To select the piping sizeDetermine the proper size using the following tables and referencefigure (only for indication).AeBBC Cdb3B'''CCda 10 a 11 a1 a2 a3 a4 a5 a6 a7 a8 a9C CdB'CCB''Bb1C CCb2a1~a11 VRV DX indoor unitsb1~b3 SV unitsc First branch kit (header)d Indoor branch kit (refnet)e VRV 5-S outdoor unitA~C PipingA: Piping between outdoor unit and (first)refrigerant branch kitChoose from the following table in accordance with the outdoor unitcapacity type. In case there is no first indoor branch kit (c), pipe A isconnected to the first SV unit or VRV DX indoor unit.HP class Piping outer diameter [mm]Gas pipe Liquid pipe8~10 19.1 9.512 22.2 12.7