Daikin FXAQ-PVJU Engineeiring Data

EDUS391100-F6 InstallationFXAQ-PVJU 29The outdoor unit is charged with refrigerant.•Use copper alloy seamless pipes.•Be sure to use both a spanner and torque wrench together, as shown•in the drawing, when connecting or disconnecting pipes to/from theunit. (Refer to Fig. 12)Refer to “Table 1” for the dimensions of fl are.•When connecting the fl are nut, coat the fl are section with ester oil or•ether oil, rotate three or four times fi rst, then screw in.(Refer to Fig. 13)CAUTIONOver-tightening may cause the fl are nuts to crack or the refrigerant to•leak.Use the fl are nut included with the unit.•Torque wrenchSpannerPiping unionFlare nutFig. 12Ester oil or ether oilFig. 13Refer to Table 1 for tightening torque.•Table 1Pipe size Tightening torque (ft-lbf) Flare dimensions A (in.) Flare shape (in.)φ 1/4” 10.5 – 12.7 0.343 – 0.358R0.016-0.031A90˚±2˚45˚±2˚φ 3/8” 24.1 – 29.4 0.504 – 0.520φ 1/2” 36.5 – 44.5 0.638 – 0.654φ 5/8” 45.6 – 55.6 0.760 – 0.776Not recommended but in case of emergencyYou must use a torque wrench but if you are obliged to install the unit without a torque wrench, you mayfollow the installation method mentioned below.After the work is finished, make sure to check that there is no gas leak.When you keep on tightening the fl are nut with a spanner, there is a point where the tightening torquesuddenly increases. From that position, further tighten the fl are nut the angle shown below:Table 2Pipe size (in.) Further tightening angle Recommended arm length of tool (in.)φ 1/4” 60 to 90 degrees Approx. 5-7/8”φ 3/8” 60 to 90 degrees Approx. 7-7/8”φ 1/2” 30 to 60 degrees Approx. 9-13/16”φ 5/8” 30 to 60 degrees Approx. 11-13/16”CAUTIONCAUTION TO BE TAKEN WHEN BRAZING REFRIGERANT PIPING•“Do not use fl ux when brazing refrigerant piping. Therefore, use the phosphor copper brazing fi lter metal(BCuP) which does not require fl ux.”(Flux has an extremely negative effect on refrigerant piping systems. For instance, if chlorine based fl uxis used, it will cause pipe corrosion. If the fl ux contains fl uorine, it will damage the refrigerant oil.)