Daikin FXUQ71MV1 Installation Manual

Also see for FXUQ100MAV1: Technical data Operation manual

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Daikin FXUQ71MV1 Installation Manual Manual pdf 11 page image

English 9Table 2• Refer to “Table 2” to determine the proper tightening torque.Not recommendable but in case of emergencyYou must use a torque wrench but if you are obliged to installthe unit without a torque wrench, you may follow the installationmethod mentioned below.When you keep on tightening the flare nut with a spanner, thereis a point where the tightening torque suddenly increases.From that position, further tighten the flare nut the angle shownbelow:Table 3After the work is finished, make sure to check that there isno gas leak.• Make absolutely sure to execute heat insulation works onthe pipe-connecting section after checking gas leakage bythoroughly studying the following figure and using theattached insulation for fitting (6) and (7). (Fasten both endswith the clamps (4).) (Refer to Fig. 23)• Wrap the sealing pad (9) only around the insulation for thejoints on the gas piping side.CAUTIONFor local insulation, be sure to insulate all the way to the pipingconnections inside the unit.Exposed piping may cause leaking or burns on contact.6-2 For upward and rightward running piping• Upward and rightward running piping are easily rigged withthe optional connecting elbow kit.• For upward running piping, detach the pipe hole cover.• Once piping are rigged, cut the pipe hole cover to size andreattach. Use scissors for cutting.(Refer to Fig. 24)Since there exists a possibility that small animals andinsects might get inside the indoor unit, attach the wir-ing through covers and make sure there are no gaps inthe through holes by applying putty or insulation (fieldsupplied).• When doing this, block any gaps between the piping pene-tration lid and the piping using putty to prevent dust fromentering the indoor unit.CAUTIONCAUTION TO BE TAKEN WHEN BRAZING REFRIGERANTPIPING“Do not use flux when brazing refrigerant piping. Therefore, usethe phosphor copper brazing filler metal (BCuP-2:JIS Z 3264/B-Cu93P-710/795:ISO 3677) which does not require flux.”(Flux has extremely harmful influence on refrigerant piping sys-tems. For instance, if the chlorine based flux is used, it willcause piping corrosion or, in particular, if the flux contains fluo-rine, it will damage the refrigerant oil.)• Before brazing local refrigerant piping, nitrogen gas shall beblown through the piping to expel air from the piping.If you brazing is done without nitrogen gas blowing, a largeamount of oxide film develops inside the piping, and couldcause system malfunction.• When brazing the refrigerant piping, only begin brazing afterhaving carried out nitrogen substitution or while insertingnitrogen into the refrigerant piping. Once this is done, con-nect the indoor unit with a flared connection.• Nitrogen should be set to 0.02 MPa with a pressure-reduc-ing valve if brazing while inserting nitrogen into the piping.(Refer to Fig. 25)Fig. 25CAUTIONDo not use anti-oxidants when brazing the piping joints.Residue can clog piping and break equipment.7. DRAIN PIPING WORK7-1 Rig drain piping (Refer to Fig. 26)As for drain piping work, perform piping in such a manner thatwater can be drained properly.As for drain piping, the connection can be made from three dif-ferent directions.• Employ a pipe with either the same diameter or with thediameter larger (excluding the raising section) than that ofthe connecting piping (PVC pipe, nominal diameter 20mm,outside diameter 26mm).• Keep the drain piping short and sloping downwards at a gra-dient of at least 1/100 to prevent air pockets from forming.(Refer to Fig. 27)CAUTIONWater pooling in the drainage piping can cause the drain to clog.Pipe size Further tightening angle Recommended armlength of toolφ9.5 (3/8”) 60 to 90 degrees Approx. 200mmφ15.9 (5/8”) 30 to 60 degrees Approx. 300mmFlaredimensions A (mm)Pipe size Tightening torqueR0.4-0.8A90˚±2˚45˚±2˚32.7-39.9 N • mFlare12.8 – 13.219.3 – 19.7φ9.5(3/8”)φ15.9(5/8”) 61.8-75.4 N • mInsulation for gaspiping (6)(accessory)Insulation for liquidpiping (7) (accessory)Clamp (4)(×4)(accessory) Fig. 23Attach to tha rootSmall sealingpad (9)(accessory)Pipe hole cover For liquid pipingFor gas pipingFor wiringFig. 24For drain pipingRefrigerant pipingPart to bebrazedTapingPressure-reducing valvehands valveNitrogenNitrogen