The 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 the
unit. (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)
CAUTION
Over-tightening may cause the fl are nuts to crack or the refrigerant to •
leak.
Use the fl are nut included with the unit. •
Torque wrench
Spanner
Piping union
Flare nut
Fig. 12
Ester oil or ether oil
Fig. 13
Refer to Table 1 for tightening torque. •
Table 1
Pipe size Tightening torque (ft-lbf) Flare dimensions A (in.) Flare shape (in.)
φ 1/4” 10.5 – 12.7 0.343 – 0.358
R0.016-0.031
A
90˚±2˚
45˚±2˚
φ 3/8” 24.1 – 29.4 0.504 – 0.520
φ 1/2” 36.5 – 44.5 0.638 – 0.654
φ 5/8” 45.6 – 55.6 0.760 – 0.776
Not recommended but in case of emergency
You must use a torque wrench but if you are obliged to install the unit without a torque wrench, you may
follow the installation method mentioned below.
After the work is fi nished, 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 torque
suddenly increases. From that position, further tighten the fl are nut the angle shown below:
Table 2
Pipe 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”
CAUTION
CAUTION 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 ux
is used, it will cause pipe corrosion. If the fl ux contains fl uorine, it will damage the refrigerant oil.)
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