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 |
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| Table 12 R410A flaring dimensions |
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|
| ||
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 |
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Table 13 R410A flaring 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 |
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|
|
|
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|
|
|
|
| Table 14 R410A flaring 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 |
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2.Procedure and precautions for flare connection
a.Check to make sure there are 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) |
|
|
|
|
1.Types of piping and their storage
The following is a general classification of the refrigerant pipe materials used for ACs.
Because the gas pressure of R410A is approximately 1.6 times as high as that of R22, copper pipes with the thickness shown in Table 10, and with minimal impurities must be used. Care must also be taken during storage to ensure that pipes are not crushed, deformed, or scratched, and that no dust, moisture or other substance enters the pipe interior. When storing sheathed copper pipes or plain copper pipes, seal the openings by pinching or taping them securely.
2.Makings and management
a.Sheathed copper pipes and
When using these pipes, check to make sure that they are the stipulated thickness. For flare nuts, be sure to used the same nut that is used on the AC unit.
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