91
Pipe expanding method
Improper pipe expanding is the main cause of refrigerant
leakage. Please expand the pipe according to the following
steps:
1. Cut the pipe.
• Confirm the pipe length according to the distance of the indoor unit.
• Cut the required pipe with pipe cutter.
2. Remove the burrs
• Remove the burrs with shaper and prevent the burrs from getting into
the pipe.
3. Put on suitable insulating pipe.
4. Put on the union nut.
• Remove the union nut on the indoor connection pipe and outdoor
valve; install the union nut on the pipe.
5. Expanding the port
• Expand the port with an expander.
Step 1 is different depending on the diametre, plese refer to the
table below:
Outer diameter (mm)
A (mm)
Max.
Min.
ø 6 - 6,35 (1/4 ")
1,3
0,7
ø 9,52 (3/8 ")
1,6
1,0
ø 12 - 12,7 (1/2 ")
1,8
1,0
ø15,8 - 16 (5/8 ")
2,4
2,2
6. Inspection
• Check the quality of expanding port. If there is any blemish, expand
the port again according to the steps above.
pipe
pipe cutter
downwards
pipe
shaper
union pipe
pipe
expander
hard
mold
pipe
improper expanding
the length is equal
leaning
damaged
surface
crack
uneven
thickness
smooth surface