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Step 7 Cutting and flaring the pipes
1
Make sure that you have the required tools available: pipe
cutter, reamer, flaring tool, and pipe holder.
2
If you wish to shorten the pipes, cut them with a pipe
cutter, ensuring that the cut edge remains at a 90° angle
to the side of the pipe. Refer to the illustrations below for
examples of edges cut correctly and incorrectly.
Pipe cutter
Pipe
3
To prevent any gas from leaking out, remove all burrs at
the cut edge of the pipe, using a reamer.
4
Slide a flare nut on to the pipe and modify the flare.
D
A
Flare
Pipe
Outer Diameter (D)
Depth (A)
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
5
Check that the flaring is correct, referring to the
illustrations below for examples of incorrect flaring.
Correct
Inclined
Damaged
Surface
Oblique
Rough
Burr
R 0.4 to 0.8 mm
Flare
L
(Unit: mm)
Flare dimension (L)
1.3
8.7 to 9.1
1.8
12.8 to 13.2
2.0
16.2 to 16.6
2.2
19.3 to 19.7
2.2
23.6 to 24.0
Cracked
Uneven
Thickness
Step 8 Connecting the assembly pipes
to the refrigerant pipes
There are two refrigerant pipes of different diameters :
•
A smaller one for the liquid refrigerant.
•
A larger one for the gas refrigerant. The inside of
copper pipe must be clean and has no dust.
1
Remove the pinch pipe on the pipes and connect the
assembly pipes to each pipe, tightening the nuts, first
manually and then with a torque wrench, a spanner
applying the following torque.
1
D
Spanner
3
Union
Outer Diameter (mm)
Ø6.35
Ø9.52
Ø12.70
Ø15.88
Ø19.05
NOTE
•
If the pipes must be shortened, see Step 7 Cutting and
flaring the pipes on page 13.
2
Torque
wrench
3
Flare
nut
Torque (N•m)
14 to 18
34 to 42
49 to 61
68 to 82
100 to 120
(1 N•m=10 kgf•cm)
English
13
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