Samsung AM MXVAFC Series - Page 49

49
ENGLISH
5. Check that you ared the pipe correctly.
 Refer to below illustrations for correct and incorrect examples of ared pipe.
Uneven ThicknessCrackedDamaged SurfaceInclinedCorrect
• 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
eciency will be reduced. So, the direction of pipe should be downward during pipe cutting or aring.
CAUTION
Connecting the ared pipes
 Check if the aring is properly done according to the standard size.
 Align the center of the piping and tighten the are nut with your hands. Then, tighten the are nut with torque wrench in
a direction of the arrow indicated in below illustration.
 Make sure to use ester oil to coat the are connection section.
Flare connection section Flare nut
Pipe
Monkey wrench
Torque wrench
Outer diameter (D) Torque Flare dimension (L)
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
D
L
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
• Blowing Nitrogen gas should be done when welding the pipe.
• Make sure to use the provided are nut.
• Make sure that there are no cracks or twisted part when you need to bend the pipe.
• Do not fasten the are nut with excessive strength.
• R-410A is a high pressure refrigerant and there is a risk of refrigerant leakage if the are connection is not coated
with ester oil. Therefore, apply ester oil to coat the are connection area.
CAUTION