Daikin FXHQ32MVE Installation Manual

Also see for FXHQ100MAVE: Operation manual Technical data Installation manual

Contents

Daikin FXHQ32MVE Installation Manual Manual pdf 9 page image

English 7Use “ Table 2 ” as a reference if a torque wrench is not available.Once work is complete, make sure there is no gas leaking. Asthe flare nut is tightened with the wrench, the torque will sud-denly increase. From that position, tighten the nut to the angleshown on “ Table 2 ”.• Make absolutely sure to execute heat insulation works on thepipe-connecting section after checking gas leakage by thor-oughly studying the following figure and using the attachedheat insulating materials for fitting (6) and (7). (Fasten bothends with the clamps (4) (accessory).)(Refer to Fig. 18)• Wrap the sealing pad (9) (accessory) only around the insula-tion for the joints on the gas piping side.(Refer to Fig. 19)CAUTIONBe sure to insulate any field piping all the way to the pipingconnection inside the unit. Any exposed piping may causecondensation or burns if touched.CAUTIONCAUTION TO BE TAKEN WHEN BRAZING REFRIGER-ANT PIPINGDo 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 infulence on refrigerant pipingsysems. For instance, if the chlorine based flux is used, it willcause pipe 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 your 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 or a flanged connection.• Nitrogen should be set to 0.02 MPa with a pressure-reducingvalve if brazing while inserting nitrogen into the piping.NOTENOTENOTENOTEThe flare nuts used must be those included with the mainbody.• Refer to Table 1 for tightening torque.Table 1Not recommendable but in case of emergencyYou must use a torque wrench but if you are obliged toinstall the unit without a torque wrench, you may follow theinstallation method mentioned below.After the work is finished, make sure to check thatthere is no gas leak.When you keep on tightening the flare nut with a spanner,there is a point where the tightening torque suddenlyincreases. From that position, further tighten the flare nutthe angle shown below:Table 27. DRAIN PIPING WORKRig the drain pipe as shown below and take measures againstcondensation. Improperly rigged piping could lead to leaks andeventually wet furniture and belongings.(1) Carry out the drain piping• For drain work, rig the pipes so that they drain reliably.• The drain pipe outlet direction can be chosen from theright rear, right, left rear, and left. Refer to “REFRIGER-ANT PIPING WORK” for right rear and right direction,and refer to Fig. 20 for left rear and left direction.Insulation for gas pipe (6)(accessory)Insulation forlocal piping(Part to be procuredin the field)(Up to the flare part)Small sealing pad (9)(accessory)Wrap from thebottom upInsulation forfield piping(Part to beprocuredin the field)Flare nutFlare nutGas pipingLiquid pipingInsulation for liquid pipe (7)(accessory)Clamp (4) (accessory) (× 4)Attach to the bottom(For both gas pipingand liquid piping)Fig. 18Fig. 19Refrigerantpiping Part to be brazedTapingPressure-reducingvalvehands valveNitrogenNitrogenPipesize Tightening torqueFlaredimensionsA (mm)Flareφ 6.4(1/4”) 14.2 – 17.2 N·m 8.7 – 9.1φ 9.5(3/8”) 32.7 – 39.9 N·m 12.8 – 13.2φ 12.7(1/4”) 49.5 – 60.3 N·m 16.2 – 16.6φ 15.9(5/8”) 61.8 – 75.4 N·m 19.3 – 19.7Pipe size Further tightening angle Recommended armlength of toolφ 6.4 (1/4”) 60 to 90 degrees Approx. 150mmφ 9.5 (3/8”) 60 to 90 degrees Approx. 200mmφ 12.7 (1/2”) 30 to 60 degrees Approx. 250mmφ 15.9 (5/8”) 30 to 60 degrees Approx. 300mmA450±20R0.4-0.890 0±2 0Rear side (metal plate)removable partLeft-facing drain pipingLeft dressing boardremovable partRear left-facingdrain pipingFig. 20