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2. Nitrogen should be set to 0.02 Mpa (0.2 kg/cm
nitrogen into the piping.
Refrigerant piping
The flare nuts used must be those included with the main body.
• Refer to Table 2 for tightening torque.
Table 2
Pipe gauge
φ 6.4
φ 9.5
φ 12.7
φ 15.9
φ 19.1
Not recommendable 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 finished, make sure to check that there is no gas leak.
When you keep on tightening the flare nut with a spanner, there is a point where the tightening torque
suddenly increases. From that position, further tighten the flare nut the angle shown below:
Table 3
Pipe size
φ 6.4 (1/4")
φ 9.5 (3/8")
φ 12.7 (1/2")
φ 15.9 (5/8")
φ 19.1 (3/4")
English
Part to be brazed
Nitrogen
Tightening torque
14.2 – 17.2N·m (144 – 176 kgf·cm)
32.7 – 39.9N·m (333 – 407 kgf·cm)
49.5 – 60.3N·m (504 – 616 kgf·cm)
61.8 – 75.4N·m (630 – 770 kgf·cm)
97.2 – 118.6N·m (990 – 1210 kgf·cm)
Further tightening angle
60 to 90 degrees
60 to 90 degrees
30 to 60 degrees
30 to 60 degrees
20 to 35 degrees
2
) with a pressure-reducing valve if brazing while inserting
Taping
hands valve
Flare dimension
A (mm)
8.6 – 9.0
12.6 – 13.0
15.8 – 16.2
19.0 – 19.4
23.3 – 23.7
Recommended arm length of tool
Pressure-reducing valve
Nitrogen
Flare shape
R0.4-0.8
Approx. 150mm
Approx. 200mm
Approx. 250mm
Approx. 300mm
Approx. 450mm
8
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