D. Flaring / Check the clamp bar and the cleanliness of the copper
pipe. / Be sure to sued the clamp bar to do the flaring with
accuracy. Use either an R410A flaring tool, or a conventional
flaring tool. flaring tools come in different sizes,so be sure to
check the size before using. When using a conventional flaring
tool, use the copper pipe gauge for clearance adjustment, etc.,
to ensure the correct A dimension (see Fig. 10)
Fig. 10 Flaring dimensions
Fig. 11 Relation between the flare nut structure and flaring tool end
Table 11 R410A flaring dimensions
Nominal
diameter
Outside
diameter
(mm)
Wall
thickness
(mm)
A (mm)
R410A flaring
tool, clutch
type
Conventional flaring tool
Clutch type Wing-nut type
1/4 6.35 0.8 0 - 0.5 1.0 - 1.5 1.5 - 2.0
3/8 9.52 0.8 0 - 0.5 1.0 - 1.5 1.5 - 2.0
1/2 12.70 0.8 0 - 0.5 1.0 - 1.5 2.0 - 2.5
Table 12 R410A flaring dimensions
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