Daikin AZQS100B7V1B Installation Manual

Contents

AZQS100~140B7V1B+Y1BSplit system air conditioners4P332194-1B – 2015.01Installation manual89. 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, chargehose, etc.) that are exclusively used for R410A installations towithstand the pressure and to prevent foreign materials (e.g.mineral oils and 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). During tests never pressurize the appliances with a pressurehigher than the maximum allowable pressure (see unit nameplate: PS). 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. Piping should be mounted so that the flare is not subjected tomechanical stress.9.1. Flaring guidelines 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 flare nuts included with the unit. Using differentflare 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 with 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.1 Torque wrench2 Spanner3 Piping union4 Flare nutNot recommended, but in case of emergencyShould you be forced to connect the piping without a torquewrench, follow the following installation method: Tighten the flare nut using a spanner until the tighteningtorque suddenly increases. From that position further tighten the flare nut to the anglelisted below:9.2. Brazing guidelines 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. Refer to figure 2.1 Refrigerant piping2 Part to be brazed3 Taping4 Manual valve5 Pressure-reducing valve6 Nitrogen 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.9.3. Stop valve operationCautions on handling the stop valve Make sure to keep both stop valves open during operation. The figure below shows the name of each part required inhandling the stop valve. The stop valve is factory closed.Place Installation period Protection methodOutdoor unit More than a month Pinch the pipeLess than a monthPinch or tape the pipeIndoor unit Regardless of theperiodPiping size(mm)Tighteningtorque (N•m)Flare dimensions A(mm)Flare shape(mm)Ø6.4 15~17 8.7~9.1Ø9.5 33~39 12.8~13.2Ø12.7 50~60 16.2~16.6Ø15.9 63~75 19.3~19.7A90 245 2R=0.4~0.8Piping size(mm)Further tightening angle(degrees)Recommended arm lengthof spanner (mm)Ø6.4 60~90 150Ø9.5 200Ø12.7 30~60 250Ø15.9 300124 312341 Service port and service port cap2 Valve stem3 Field piping connection4 Stem cap