Samsung AC BNPDBC Series User & Installation Manual page 47

5 Check that you flared the pipe correctly.
Below figures shows some examples of incorrectly flared pipes.
Correct
CAUTION
• If foreign matters or burrs are not removed after cutting the pipe, refrigerant gas may leak.
• If foreign matters enter inside of the pipe, the important interior parts of the unit may get damaged or
product efficiency will be reduced. Therefore, direction of the pipe should be downward during cutting
or flaring the pipe.
Tightening flare connection part
• Check that the flaring is properly made.
• Align the center of the piping and sufficiently tighten the flare nut with fingers. Then, tighten the flare
nut with torque wrench until the wrench clicks. When tightening the flare nut with torque wrench,
ensure the direction for tightening follows the arrow on the wrench.
• Make sure to use ester oil to coat the flare connection part.
Pipe
Flare
Flare nut
connection part
CAUTION
• Blowing nitrogen gas should be done when brazing the pipe.
• Make sure to use the provided flare nut.
• Make sure that there are no cracks when bending the pipe.
• Do not fasten the flare nut with excessive strength.
Inclined Damaged surface
Outer
diameter
(D, mm)
ø 6.35
ø 9.52
ø 12.70
ø 15.88
Cracked
Connection Flare
torque dimension
(kgf•cm) (L, mm)
145~175
333~407
505~615
630~769
Uneven thickness
Flare shape (mm)
R 0.4~0.8
D
L
English 47