| Table | FILE NO. | |||||
|
|
|
| ||||
|
|
|
|
|
|
| |
|
|
|
| Thickness in. (mm) |
| ||
|
|
|
|
|
|
| |
Nominal diameter (in.) |
| Outer diameter (mm) | R410A |
| R22 |
| |
|
|
|
|
|
|
|
|
1/4 |
| 6.35 | 0.0315 | (0.80) |
| 0.0315 (0.80) |
|
|
|
|
|
|
|
| |
3/8 |
| 9.52 | 0.0315 (0.80) |
| 0.0315 (0.80) |
| |
|
|
|
|
|
|
| |
1/2 |
| 12.70 | 0.0315 (0.80) |
| 0.0315 (0.80) |
| |
|
|
|
|
|
|
|
|
For copper pipes, flare joints or socket joints are used. Prior to use, be sure to remove all contaminants.
a)Flare Joints
Flare joints used to connect the copper pipes cannot be used for pipings whose outer diameter exceeds 20 mm. In such a case, socket joints can be used.
Sizes of flare pipe ends, flare joint ends and flare nuts are as shown in Tables
b)Socket Joints
Socket joints are such that they are brazed for connections, and used mainly for thick pipings whose diameter is larger than 0.7874 in. (20 mm).
Thicknesses of socket joints are as shown in Table
Nominal diameter (in) | Reference outer diameter of | Minimum joint thickness | |
copper pipe jointed (mm) | in. (mm) | ||
| |||
|
|
| |
1/4 | 6.35 | 0.0197 (0.50) | |
|
|
| |
3/8 | 9.52 | 0.0236 (0.60) | |
|
|
| |
1/2 | 12.70 | 0.0276 (0.70) | |
|
|
|
When performing the refrigerant piping installation, care should be taken to ensure that water or dust does not enter the pipe interior, that no other oil than lubricating oils used in the installed
a)Cutting the Pipe
By means of a pipe cutter, slowly cut the pipe so that it is not deformed.
b)Removing Burrs and Chips
If the flared section has chips or burrs, refrigerant leakage may occur. Carefully remove all burrs and clean the cut surface before installation.
c)Insertion of Flare Nut
– 9 –