Table 6-2-1 Thicknesses of annealed copper pipes
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| Thickness (mm) | |
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Nominal diameter | Outer diameter (mm) | R410A |
| R22 |
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1/4 | 6.35 | 0.80 |
| 0.80 |
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3/8 | 9.52 | 0.80 |
| 0.80 |
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1/2 | 12.70 | 0.80 |
| 0.80 |
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5/8 | 15.88 | 1.00 |
| 1.00 |
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(2)Joints
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 20 mm.
Thicknesses of socket joints are as shown in Table
Table
Nominal diameter | Reference outer diameter of | Minimum joint thickness | |
copper pipe jointed (mm) | (mm) | ||
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1/4 | 6.35 | 0.50 | |
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3/8 | 9.52 | 0.60 | |
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1/2 | 12.70 | 0.70 | |
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5/8 | 15.88 | 0.80 | |
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6-2-1. Processing of piping materials
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 other than lubricating oils used in the installed air conditioner is used, and that refrigerant does not leak. When using lubricating oils in the piping processing, use such lubricating oils whose water content has been removed. When stored, be sure to seal the container with an airtight cap or any other cover.
(1)Flare Processing procedures and precautions
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
d)Flare processing
Make certain that a clamp bar and copper pipe have been cleaned.
By means of the clamp bar, perform the flare processing correctly.
Use either a flare tool for R410A or conven- tional flare tool.
Flare processing dimensions differ according to the type of flare tool. When using a conven- tional flare tool, be sure to secure “dimension A” by using a gauge for size adjustment.
∅D
A
Fig. 6-2-1 Flare processing dimensions
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