Daikin ERSQ011AAV1 Installation Manual

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Daikin ERSQ011AAV1 Installation Manual Manual pdf 10 page image

Installation manual7 ERSQ+ERRQ011~016AAV1+Y1Outdoor unit for air to water heat pump4PW49635-1A6. 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 "6.3. Guidelines for handlingstop valve" on page 8.■ Only use the flare nuts included with the unit. Using differentflare nuts may cause the refrigerant to leak.■ Ensure that the field piping and connections are not subjected tostress.■ Use appropriate fire resistant piping insulation according tonational regulations.6.1. Guidelines for brazing■ Make sure to blow through with nitrogen when brazing.Blowing through with nitrogen prevents the creation of largequantities of oxidized film on the inside of the piping. An oxidizedfilm adversely affects valves and compressors in therefrigerating system and prevents proper operation.■ The nitrogen pressure should be set to 0.02 MPa (i.e., justenough so it can be felt on the skin) with a pressure-reducingvalve.■ Do not use anti-oxidants when brazing the 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.6.2. Guidelines for flare connection■ Flares should not be re-used. New ones should be made inorder to prevent leaks.■ Use a pipe cutter and flare tool suitable for the refrigerant used.■ Only use the annealed flare nuts included with the unit. Usingdifferent flare nuts may cause the refrigerant to leak.■ Please refer to the table for flaring dimensions and tighteningtorques (too much tightening will result in splitting the flare).■ When connecting the flare nut, coat the flare inner surface withether oil or ester oil and initially tighten 3 or 4 turns by handbefore tightening firmly.■ When loosening a flare nut, always use two wrenches together.When connecting the piping, always use a spanner and torquewrench together to tighten the flare nut to prevent flare nutcracking and leaks.Installation period Protection methodMore than a month Pinch the pipeLess than a monthPinch or tape the pipeRegardless of the period1 Refrigerant piping2 Part to be brazed3 Taping4 Hands valve5 Pressure-reducing valve6 NitrogenPiping size(mm)Tighteningtorque (N•m)Flare dimensions A(mm)Flare shape(mm)Ø9.5 33~39 12.8~13.2Ø15.9 63~75 19.4~19.71 2 3 4 566R=0.4~0.845 ±290 ±2A4 2311 Piping union2 Spanner3 Flare nut4 Torque wrench