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ting. To facilitate this operation, it is advisable to insert a piece of PVC pipe of a
suitable diameter and the same length as the wall thickness, into the hole in the
wall.
Adequate materials must be selected since the operating pressure values are sen-
sibly higher than those of the R22 refrigerant.
The following table gives the thickness values of the recommended copper pipes
in relation to the nominal diameters of the connecting lines. Do not use pipes
whose thickness is less than 0.8 mm.
Pipe thickness Tab.
Nominal
diameter (mm) Æ
diameter (")
1/4
3/8
1/2
5/8
If the pipes are longer than the effective requirements, they can be cut and
re-flared by operating in the following way:
If the pipes are longer than necessary, they can be cut and flared again as descri-
bed below:
1.Pipe cutting
Use a pipe cutter (Fig. 5).
Proceed with care when cutting the pipe so as to prevent it from becoming defor-
med. Cut the pipe to the required length (the cut must be horizontal).
2.How to remove burrs or splinters
Refrigerant could leak if the surface of the flare is warped or splintered. It is advi-
sable to remove the burrs by holding the pipe end downwards (Fig. 6).
Remove the burrs and trim the surface of the cut edge.
3.Insert the union
Remember to insert the union before flaring the pipe (Fig. 7).
4. Pipe flaring
Make sure that the pipe and swaging machine are clean.
Remember to comply with the instructions in the following tables ("Re-flanging
thickness" and "Flare and Union dimensions") when flaring the pipes.
Clamp the pipe (2 Fig. 8) in a vice (1 Fig. 8) and begin to flare it (it is best to place
a drop of refrigerating oil between the rubbing parts).
Fig. Re-flanging thickness
MACHINE INSTALLATION
Outer
R22 - R407C
6.35
0.80
9.52
0.80
12.70
0.80
15.88
1.00
Thickness (mm)
R410A
0.80
0.80
0.80
1.00
Fig.5
Fig.6
Fig.7
Fig.8
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