Pipe Expanding Method - Friedrich MWM24Y3J Installation And Operation Manual

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
● Confirm the pipe length according t
the distance of indoor unit and
outdoor unit.
● Cut pipe with pipe cutter.
pipe
leaning
B: Remove the burrs
● Remove the burrs with shaper and
prevent the burrs from getting into
the pipe.
downwards
C: Insulate piping
D: Put on the flare nut
● Remove the flare nut on the indoor
connection pipe and outdoor
valve; install the flare nut on the pipe.
union pipe
pipe
pipe cutter
uneven burr
pipe
shaper
E: Expand the port
● Expand the port with expander.
Note:
● "A" is different according to the
diameter, please refer to the sheet
below:
Outer diameter
In(mm)
1/4"(Φ6-6.35)
3/8"(Φ9.52)
1/2"(Φ12-12.7)
5/8"(Φ15.8-16)
F: Inspection
● Check the quality of expanding port.
If there is any blemish, expand the
port again according to the steps
above.
smooth surface
the length is equal
31
hard
mold
expander
A(mm)
Max
1.3
1.6
1.8
2.4
improper expanding
leaning damaged crack
surface
pipe
Min
0.7
1.0
1.0
2.2
uneven
thickness