15
ENGLISH
Direction of the pipe when brazing
f
Brazing the pipe should be done with the pipe headed downward or horizontally.
f
Avoid brazing with the pipe headed upward.
t
The test liquid used to detect leakage after pipe brazing should be the designated one. The use of the test liquid
containing sulfur element may cause pipe corrosion.
CAUTION
Cutting or Flaring the pipes
f
Make sure that you prepared the required tools.
- Pipe cutter, reamer, flaring tool and pipe holder, etc.
f
If you want to shorten the pipe, cut it using a pipe cutter ensuring that the cut edge remains at 90° with the side of the pipe.
- There are some examples of correctly and incorrectly cut edges below.
90°
Oblique
Rough
Burr
Pipe
Pipe cutter
f
To prevent a gas leak, remove all burrs at the cut edge of the pipe using a reamer.
f
Carry out flaring work using flaring tool as shown below.
A
Flaring bar
Pipe
York
Flaring bar
Pipe
Flare nut
Clutch type
Wing nut type
[Flaring tool]
Pipe diameter (mm)
A(mm)
Flare tool for R-410A
clutch type
Conventional flare tool
Clutch type
Wing nut type
ø6.35
0~0.5
1.0~1.5
1.5~2.0
ø9.52
0~0.5
1.0~1.5
1.5~2.0
ø12.70
0~0.5
1.0~1.5
1.5~2.0
ø15.88
0~0.5
1.0~1.5
1.5~2.0
f
Check that you flared the pipe correctly.
- There are some examples of incorrectly flared pipes below.
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, the 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
