12 MS-SVN15B-EN
Connection of Refrigerant Tubing
4. Make a flare at the end of copper tube with a flare tool (Figure 14, 15).
Check if (L) is flared uniform and is not cracked or scratched. L Dimension: 1.4 to 1.7 mm (6.35
mm dia) 1.8 to 2.0 mm (9.53 mm dia) 1.9 to 2.2 mm (12.7 mm dia) 2.1 to 2.4 mm (15.88 mm
dia)
A good flare should have the following characteristics:
– Inside surface is glossy and smooth.
– Edge is smooth.
– Tapered sides are of uniform length.
Bending
5. When bending the tube, be careful not to crush it. To prevent crushing of the tube, bend it
gently and do not bend the tube at a radius curvature of less than 100 mm.
6. If the copper tube is bent or pulled too often, it will become stiff. Do not bend the pipe more
than three times at one place.
Cautions before connecting tubes tightly
7. Be sure to apply a sealing cap or water-proof tape to prevent dust or water from getting into
the tubes before they are used.
8. Be sure to apply refrigerant lubricant to the matching surfaces of the flare and union before
connecting them together. This is effective for reducing gas leaks (Figure 16).
Figure 3.
Figure 4.
Figure 5.
Flar e tool
Flar e nut
Copper
tubing
L
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