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Connecting the flared pipes
Check if the flaring is properly done according to the standard size.
Align the center of the piping and tighten the flare nut with your hands. Then, tighten the flare nut with torque wrench in
a direction of the arrow indicated in below illustration.
Make sure to use ester oil to coat the flare connection section.
Pipe
Flare connection section
Flare nut
Outer diameter (L)
mm
inch
6.35
1/4
9.52
3/8
12.7
1/2
15.88
5/8
Blowing Nitrogen gas should be done when welding the pipe.
Make sure to use the provided flare nut.
CAUTION
Make sure that there are no cracks or twisted part when you need to bend the pipe.
Do not fasten the flare nut with excessive strength.
R-410A is a high pressure refrigerant and there is a risk of refrigerant leakage if the flare connection is not coated
with ester oil. Therefore, apply ester oil to coat the flare connection area.
Torque (D)
N·m
lbf·ft
14 ~ 18
10.3 ~ 13.3
8.7 ~ 9.1
34 ~ 42
25.1 ~ 31.0
12.8 ~ 13.2
49 ~ 61
36.1 ~ 45.0
16.2 ~ 16.6
68 ~ 82
50.2 ~ 60.5
19.3 ~ 19.7
ENGLISH-39
Monkey wrench
Torque wrench
Flare dimension
Flare shape [mm(inch)]
mm
inch
0.34 ~ 0.36
0.50 ~ 0.52
0.64 ~ 0.65
0.76 ~ 0.78
R 0.4~0.8
(0.016~0.032)
L
D
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