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10-5-2. Refrigerant Piping Connection
Flaring
1. Cut the pipe with a pipe cutter.
2. Insert a flare nut into the pipe, and flare the pipe.
Projection margin in flaring: A (Unit: mm)
Rigid (Clutch type)
Imperial (Wing nut type)
3. Flaring size : B (Unit : mm)
In case of flaring for R410A with the conventional flare tool, pull it out approx. 0.5 mm more than that of R22 to adjust to the
specified flare size. The copper pipe gauge is useful for adjusting projection margin size.
Tighten the connection
Align the centers of the connecting pipes and tighten the flare nut as much as possible with your fingers. Then tighten the nut with a
wrench and torque wrench as shown in the figure.
(Unit: N·m)
Outer diameter of copper pipe R410A tool used Conventional tool used
6.35 0 to 0.5 1.0 to 1.5
9.52 0 to 0.5 1.0 to 1.5
12.7 0 to 0.5 1.0 to 1.5
Outer diameter of copper pipe R410A
6.35 1.5 to 2.0
9.52 1.5 to 2.0
12.7 2.0 to 2.5
Outer diameter of copper pipe
B
R410A R22
6.35 9.1 9.0
9.52 13.2 13.0
12.7 16.6 16.
2
CAUTION
Do not apply excessive force. Otherwise, the nut may break.
Outer diameter of copper pipe Tightening torque
6.φ
φ
φ
35 mm 14 to 18 (1.4 to 1.8 kgf·m)
9.52 mm 33 to 42 (3.3 to 4.2 kgf·m)
12.7 mm 50 to 62 (5.0 to 6.2 kgf·
m)
Obliquity
Roughness
Warp
Die
Pipe
+0
–0.4
Half union
Flare nut
Externally threaded side
Use a wrench to secure.
Internally threaded side
Use a torque wrench to tighten.
Flare at indoor
unit side
Flare at outdoor unit side
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