Daikin FUQ71CVEB Installation Manual page 16

Table 1
Piping size (mm)
φ 6.4
φ 9.5
φ 12.7
φ 15.9
CAUTION
Do not tighten flare nuts too tight.
If a flare nut cracks, the refrigerant may leak.
• If there is no torque wrench, use Table 2 as a rule of thumb.
When tightening a flare nut with a spanner harder and harder, there is a point where the tightening torque
suddenly increases.
From that position, tighten the nut additionally the angle shown in Table 2.
After the work is finished, check securely that there is no gas leak.
If the nut is not tightened as instructed, it may cause slow refrigerant leak and result in malfunction (such
as does not cool or heat).
Table 2
Piping size (mm)
φ 6.4
φ 9.5
φ 12.7
φ 15.9
CAUTION
Insulation of field piping must be carried out up to the connection inside the casing.
If the piping is exposed to the atmosphere, it may cause sweating, burn due to touching the piping, electric
shocks or a fire due to the wiring touching the piping.
15
Tightening torque (N·m)
15.7 ± 1.5
36.3 ± 3.6
54.9 ± 5.4
68.6 ± 6.8
Tightening angle
60° – 90°
60° – 90°
30° – 60°
30° – 60°
Dimension for processing
flare A (mm)
8.9 ± 0.2
13.0 ± 0.2
16.4 ± 0.2
19.5 ± 0.2
Recommended arm length of tool used
Approximately 150mm
Approximately 200mm
Approximately 250mm
Approximately 300mm
Flare shape
R0.4-0.8
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