connections.
Fig. 12
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 8)
(3) Remove the flare nut from the unit and be sure to
mount it on the copper tube.
(4) Make a flare at the end of copper tube with a flare
tool.* (Fig. 10)
(*Use “RIGID” or equivalent.)
A good flare should have the following characteristics:
● inside surface is glossy and smooth.
● edge is smooth.
● tapered sides are of uniform length.
3-5. Caution before Connecting Tubes Tightly
a) 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.
b) 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. (Fig. 11)
c) For proper connection, align the union tube and flare
tube straight with each other, then screw in the flare
nut lightly at first to obtain a smooth match. (Fig. 12)
3-6. Tubing Connections
a) Temporary connection:
Screw in 3 – 5 rotations by hand. (Fig.13)
b) To fasten the flare nuts, apply specified torque as:
Table 5
protrusion is as shown in the figure.
Tube Dia. Tightening Torque
6.35 mm 18 N·m (180 kgf·cm)
9.52 mm 42 N·m (420 kgf·cm)
12.70 mm 55 N·m (550 kgf·cm)
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