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Table 3-2-1 Thicknesses of annealed copper pipes
Table 3-2-2 Minimum thicknesses of socket joints
(2) Joints
For copper pipes, flare joints or socket joints are
used. Prior to use, be sure to remove all contami-
nants.
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 3-2-3 to 3-2-
6 below.
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 3-2-2.
3-2-2. 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 condi-
tioner 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
Nominal diameter
1/4
3/8
1/2
5/8
Outer diameter (mm)
6.35
9.52
12.70
15.88
Thickness (mm)
R410A R22
0.80 0.80
0.80 0.80
0.80 0.80
1.00 1.00
Nominal diameter
1/4
3/8
1/2
5/8
Reference outer diameter of
copper pipe jointed (mm)
6.35
9.52
12.70
15.88
Minimum joint thickness
(mm)
0.50
0.60
0.70
0.80