Daikin VRV III-S Installation Manual

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Daikin VRV III-S Installation Manual Manual pdf 9 page image

RXYSQ4~6P7V3B + RXYSQ4~6P7Y1BVRVIII-S system air conditioner4PW35338-1Installation manual67.1. Selection of piping material■ Foreign materials inside pipes (including oils for fabrication)must be ≤30 mg/10 m.■ Construction material: phosphoric acid deoxidized seamlesscopper for refrigerant.■ Temper grade: use piping with temper grade in function of thepipe diameter as listed in table below.■ The pipe thickness of the refrigerant piping should comply withrelevant local and national regulations. The minimal pipethickness for R410A piping must be in accordance with the tablebelow.O = Annealed1/2H = Half hard■ Make sure to use the particular branches of piping that havebeen selected.■ In case the required pipe sizes (inch sizes) are not available, it isalso allowed to use other diameters (mm sizes), taken thefollowing into account:■ select the pipe size nearest to the required size.■ use the suitable adapters for the change-over from inch tomm pipes (field supply).8. PRECAUTIONS ON REFRIGERANT PIPING■ Do not allow anything other than the designated refrigerant toget mixed into the freezing cycle, such as air, etc. If anyrefrigerant gas leaks while working on the unit, ventilate theroom thoroughly right away.■ Use R410A only when adding refrigerantInstallation tools:Make sure to use installation tools (gauge manifold charge hose,etc.) that are exclusively used for R410A installations to withstandthe pressure and to prevent foreign materials (e.g. mineral oilsand moisture) from mixing into the system.Vacuum pump:Use a 2-stage vacuum pump with a non-return valveMake sure the pump oil does not flow oppositely into the systemwhile the pump is not working.Use a vacuum pump which can evacuate to –100.7 kPa (5 Torr,–755 mm Hg).■ In order to prevent dirt, liquid or dust from entering the piping,cure the piping with a pinch or taping.Great caution is needed when passing copper tubes throughwalls.■ For handling of stop valves, refer to "9.3. How to use the stopvalve" on page 8.■ Only use the flare nuts included with the unit. Using differentflare nuts may cause the refrigerant to leak.■ Always use the supplied copper gasket when connecting thegas pipe supplied with the unit. See "9. Refrigerant piping" onpage 7.8.1. Cautions for brazing■ Be sure to carry out a nitrogen blow when brazing.Brazing without carrying out nitrogen replacement or releasingnitrogen into the piping will create large quantities of oxidizedfilm on the inside of the pipes, adversely affecting valves andcompressors in the refrigerating system and preventing normaloperation.■ When brazing while inserting nitrogen into the piping, nitrogenmust be set to 0.02 MPa with a pressure-reducing valve (=justenough so that it can be felt on the skin).8.2. Cautions for flare connection■ See the following table for flare part machining dimensions.■ When connecting the flare nuts, apply refrigerant ether or esteroil to the inside and outside of the flares and turn them three orfour times at first.■ When loosening a flare nut, always use two wrenches incombination. When connecting the piping, always use a spannerand torque wrench in combination to tighten the flare nut.■ See the following table for tightening torque.(Applying too much torque may cause the flares to crack.)■ After all the piping has been connected, use nitrogen to performa gas leak check.Pipe ØTemper grade of pipingmaterialMinimal thickness t(mm)6.4 / 9.5 / 12.7 O 0.8015.9 O 119.1 1/2H 1Installation period Protection methodMore than a month Pinch the pipeLess than a monthPinch or tape thepipeRegardless of theperiod1 Refrigerant piping2 Part to be brazed3 Taping4 Hands valve5 Pressure-reducing valve6 NitrogenPipe sizeTighteningtorque (N•m) A (mm) Flare shapeØ9.5 32.7~39.9 12.8~13.2Ø15.9 61.8~75.4 19.3~19.7Ø19.1 97.2~118.6 12.3~23.71 2 3 4 56612 3 41 Piping union2 Spanner3 Flare nut4 Torque wrenchR=0.4~0.845 ±290 ±2A