Appendix 3: Pipe Expanding Method - Lennox LI018CI-180P432 Service Manual

Appendix 3: 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 pip
● Confirm the pipe length according to the distance of indoor unit and outdoor unit.
● Cut the required pipe with pipe cutter.
B:Remove the burrs
● Remove the burrs with shaper and prevent the burrs from getting into the pipe.
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.
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(inch)
Ф1/4
Ф3/8
Ф1/2
Ф5/8
F:Inspection
● Check the quality of expanding port. If there is any blemish, expand the
port again according to the steps above.
74
A(inch)
Max Min
2/39 1/36
1/16 1/51
1/14 1/51
5/53 2/23
Pipe
Pipe cutter
Leaning Uneven
Pipe
Shaper
Downwards
Union pipe
Pipe
Hard
mold
Expander
Pipe
Smooth surface
Improper expanding
leaning damaged crack
surface
The length is equal
Installation and Maintenance
Service Manual
Burr
uneven
thickness