45
ENGLISH
5. Check that you flared the pipe correctly.
f
Refer to below illustrations for correct and incorrect examples of flared pipe.
Uneven Thickness
Cracked
Damaged Surface
Inclined
Correct
t
If foreign matters or burrs are not removed after cutting pipe, refrigerant gas may leak.
t
If foreign matters enter inside the pipe, important interior parts of the unit may get damaged or product
efficiency will be reduced. So, the direction of pipe should be downward during pipe cutting or flaring.
CAUTION
Connecting the flared pipes
f
Check if the flaring is properly done according to the standard size.
f
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.
f
Make sure to use ester oil to coat the flare connection section.
Flare connection section
Flare nut
Pipe
Monkey wrench
Torque wrench
Outer diameter
Torque
Flare dimension
Flare shape [mm(inch)]
mm
inch
N·m
lbf·ft
mm
inch
6.35
1/4
14 ~ 18
10.3 ~ 13.3
8.7 ~ 9.1
0.34 ~ 0.36
90° ±2°
45° ±2°
R 0.4~0.8
(0.016~0.032)
9.52
3/8
34 ~ 42
25.1 ~ 31.0
12.8 ~ 13.2
0.50 ~ 0.52
12.7
1/2
49 ~ 61
36.1 ~ 45.0
16.2 ~ 16.6
0.64 ~ 0.65
15.88
5/8
68 ~ 82
50.2 ~ 60.5
19.3 ~ 19.7
0.76 ~ 0.78
t
Blowing Nitrogen gas should be done when welding the pipe.
t
Make sure to use the provided flare nut.
t
Make sure that there are no cracks or twisted part when you need to bend the pipe.
t
Do not fasten the flare nut with excessive strength.
t
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.
CAUTION
