Fig. 11 Relation between the flare nut structure and flaring tool end
Table 11 R410A flaring dimensions
Nominal | Outside | Wall thickness |
|
|
| A (mm) |
|
|
diameter | diameter | (mm) |
|
|
|
|
|
|
R410A flaring |
|
| Conventional flaring tool |
| ||||
| (mm) |
| tool, clutch type |
|
|
| ||
|
|
| Clutch 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 R22 flaring dimensions |
|
|
|
| ||
Nominal | Outside | Wall thickness |
|
|
| A (mm) |
|
|
diameter | diameter | (mm) |
|
|
|
| ||
R410A flaring |
|
| Conventional flaring tool |
| ||||
| (mm) |
| tool, clutch type |
|
|
| ||
|
|
| Clutch type | |||||
1/4 | 6.35 | 0.8 | 0 - 0.5 |
| 0.5 | - 1.0 | 1.0 | - 1.5 |
3/8 | 9.52 | 0.8 | 0 - 0.5 |
| 0.5 | - 1.0 | 1.0 | - 1.5 |
1/2 | 12.70 | 0.8 | 0 - 0.5 |
| 0.5 | - 1.0 | 1.5 | - 2.0 |
Table 13 R410A flare and flare nut dimensions Unit: mm
Nominal | Outside | Wall thickness | A +0, | B | C | D | Flare nut |
diameter | diameter (mm) | (mm) |
| dimension | dimension | dimension | width |
1/4 | 6.35 | 0.8 | 9.1 | 9.2 | 6.5 | 13 | 17 |
3/8 | 9.52 | 0.8 | 13.2 | 13.5 | 9.7 | 20 | 22 |
1/2 | 12.70 | 0.8 | 16.6 | 16.0 | 12.9 | 23 | 26 |
|
| Table 14 R22 flare and flare nut dimensions Unit: mm |
|
| |||
Nominal | Outside | Wall thickness | A +0, | B | C | D | Flare nut |
diameter | diameter (mm) | (mm) |
| dimension | dimension | dimension | width |
1/4 | 6.35 | 0.8 | 9.0 | 9.2 | 6.5 | 13 | 17 |
3/8 | 9.52 | 0.8 | 13.0 | 13.5 | 9.7 | 20 | 22 |
1/2 | 12.70 | 0.8 | 16.2 | 16.0 | 12.9 | 20 | 24 |
2.Procedure and precautions for flare connection
a.Check to make sure there is no scratches, dust, etc., on the flare and union.
b.Align the flared surface with the axial center of the union.
c.Use a torque wrench, and tighten to the specified torque. The tightening torque for R410A is the same as the conventional torque value for R22. Be careful, because if the torque is too weak, it may lead to a gas leak. If it is too strong, it may split the flare nut or make it impossible to remove the flare nut.
Table 15 R410A tightening torque
Nominal | Outside | Tightening torque | Torque wrench tightening torque |
diameter | diameter (mm) | N.m (kgf.cm) | N.m (kgf.cm) |
1/4 | 6.35 | 14 - 18 (140 - 180) | 18 (180) |
3/8 | 9.52 | 33 - 42 (330 | 42 (420) |
1/2 | 12.70 | 55 (550) | 55 (550) |
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