26
CAUTION
The bending angle should not exceed 90°; otherwise, wrinkles will be formed in the pipe, which can easily break.
The bending radius should not be smaller than 3.5D (pipe diameter) and should be as large as possible to
prevent the pipe from becoming flattened or crushed.
When mechanically bending the pipe, the pipe bender inserted into the connecting pipe must be cleaned.
1. Brazing pipes
When brazing pipes, fill the pipes with nitrogen.
CAUTION
When it is necessary to fill the piping with nitrogen during welding, the pressure must be kept at 0.02MPa
using a pressure relief valve.
Do not use flux when soldering the piping. Use a phosphor copper solder that does not require flux.
Do not use any antioxidants when soldering the piping. The piping may become clogged with residual
antioxidants, which may block components such as electronic expansion valves during operation.
2. Flaring
To cut the piping with a pipe cutter, rotate the
pipe cutter repeatedly.
Put the pipe into the connecting nut flaring,
and both the gas pipe and liquid pipe of the
indoor unit are connected by flaring.
Outer diameter
(mm)
A (mm)
Max.
Min.
Φ6.35
8.7
8.3
Φ9.52
12.4
12.0
Φ12.7
15.8
15.4
Φ15.9
19.1
18.6
Φ19.1
23.3
22.9
Nitroge
n
Nitrogen
Refrigerant
piping
Pressure reducing valve
Welding
position
Bandage
Manual valve
Pipe cutter
Slope Rough
Burrs
90°
R0.4–0.8
A
90°±4
45°±
2
