Samsung AM MXVAFC Series Installation Manual page 49

5 . Check that you flared the pipe correctly .
f Refer to below illustrations for correct and incorrect examples of flared pipe . f
Correct Inclined
• If foreign matters or burrs are not removed after cutting pipe, refrigerant gas may leak .
• If foreign matters enter inside the pipe, important interior parts of the unit may get damaged or product
CAUTION
efficiency will be reduced . So, the direction of pipe should be downward during pipe cutting or flaring .
Connecting the flared pipes
f Check if the flaring is properly done according to the standard size . f
f Align the center of the piping and tighten the flare nut with your hands . Then, tighten the flare nut with torque wrench in f
a direction of the arrow indicated in below illustration .
f Make sure to use ester oil to coat the flare connection section .
f
Pipe
Flare connection section
Outer diameter (D)
mm inch
6 . 3 5 1/4
9 . 5 2 3/8
12 . 7 1/2
15 . 8 8 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 .
Damaged Surface
Flare nut
Torque
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
Cracked Uneven Thickness
Monkey wrench
Torque wrench
Flare dimension (L)
mm inch
0 . 3 4 ~ 0 . 3 6
0 . 5 0 ~ 0 . 5 2
0 . 6 4 ~ 0 . 6 5
0 . 7 6 ~ 0 . 7 8
Flare shape [mm(inch)]
R 0 . 4 ~0 . 8
(0 . 0 16~0 . 0 32)
D
L
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