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Table 6-2-1 Thicknesses of annealed copper pipes
Thickness (mm)
Nominal diameter Outer diameter (mm) R410A R22
1/4 6.35 0.80 0.80
3/8 9.52 0.80 0.80
1/2 12.70 0.80 0.80
5/8 15.88 1.00 1.00
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 6-2-2.
(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 6-2-3 to 6-2-6
below.
Table 6-2-2 Minimum thicknesses of socket joints
Nominal diameter
Reference outer diameter of Minimum joint thickness
copper pipe jointed (mm) (mm)
1/4 6.35 0.50
3/8 9.52 0.60
1/2 12.70 0.70
5/8 15.88 0.80
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.
Fig. 6-2-1 Flare processing dimensions
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
A