40
Pipe expanding method
Note:
Improper pipe expanding is the main cause of refrigerant leakage. Please expand
the pipe according to the following steps:
A: Cut the pipe
the distance of indoor unit and
outdoor unit.
● Cut the required pipe with pipe cutte
r.
pipe
pipe cutter
leaning
uneven
burr
B: Remove the burrs
● Remove the burrs with shaper and
prevent the burrs from getting into
the pipe.
downwards
pipe
shaper
C: Put on suitable insulating pipe
D: Put on the union nut
● Remove the union nut on the indoor
connection pipe and outdoor valve;
install the union nut on the pipe.
union pipe
pipe
E: Expand the port
● Expand the port with expande
r.
Note:
● "A" is di
fferent according to the
diameter, please refer to the sheet
below:
expander
hard
mold
pipe
F: Inspection
● Check the quality of expanding port.
If there is any blemish, expand the
port again according to the steps
above.
the length is equa
l
improper expanding
leaning
damaged
surface
crack
uneven
thickness
smooth surface
Outer diameter
(mm)
A(mm)
Max
Min
Φ6-6.35(1/4")
Φ9.52(3/8")
Φ12-12.7(1/2")
Φ15.8-16(5/8")
1.3
0.7
1.6
1.0
1.8
1.0
2.4
2.2
