74
Pipe forming/End positioning
Flaring
1. Cut the pipe with a pipe cutter.
2. Insert a flare nut into pipe, and flare the pipe.
As the flaring sizes of R410A differ from those of refrigerant R22, the flare tools newly manufactured for R410A
are recommended.
However, the conventional tools can be used by adjusting projection margin of copper pipe.
Flaring diam. Meter size: A (Unit: mm)
* In case of flaring for R410A with the
conventional flare tool, pull it out
approx. 0.5mm more than that for R22
to adjust to the specified flare size.
The copper pipe gauge is useful for
adjusting projection margin size.
Projection margin in flaring: B (Unit: mm)
Rigid (Clutch type)
Imperial (Wing nut type)
Connection of refrigerant pipe
Connect all the refrigerant pipes with flare connecting
work.
• Since the atmospheric pressure only is sealed as the
sealing gas, it is not abnormal that “Pushu…” sound
is not heard when the flare nut is removed.
• Be sure use a double spanner for pipe connecting
work of the indoor unit.
• Refer to the following table for tightening torque.
REQUIREMENT
If an excessive torque is applied, the nut may
crack depending on the installation conditions.
Outer diam. of
copper pipe
9.5
12.7
15.9
A
R410A R22
13.2 13.0
16.6 16.2
19.7 19.2
+0
-
0.4
Outer diam. of
copper pipe
9.5
12.7
15.9
R410A tool used
R410A R22
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
0 to 0.5 (Same as left)
Conventional tool used
R410A R22
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
1.0 to 1.5 0.5 to 1.0
Outer diam. of copper pipe
9.5
12.7
15.9
R410A
1.5 to 2.0
2.0 to 2.5
2.0 to 2.5
R22
1.0 to 1.5
1.5 to 2.0
1.5 to 2.0
Connecting pipe
outer diam. (mm)
Ø9.5
Ø12.7
Ø15.9
Ø19.1
Tightening
torque (N•m)
33 to 42
(3.3 to 4.2 kgf•m)
50 to 62
(5.0 to 6.2 kgf•m)
68 to 82
(6.8 to 8.2 kgf•m)
98 to 118
(10 to 12 kgf•m)
Re-tightening
torque (N•m)
42 (4.2 kgf•m)
50 (5.0 kgf•m)
68 (6.8 kgf•m)
98 (10 kgf•m)
90˚
Obliquity Roughness Warp
A
B
Work using double spanner
To Next Page
Loading...
Need help?
General
