34
PIPE EXPANDING METHOD
Note:
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 between indoor and outdoor unit.
• Cut the pipe with pipe cutter.
2. Remove the burrs
• Remove the burrs with a sharper 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.
pipe
pipe cutter
leaning
uneven
burr
pipe
shaper
downwards
union pipe
pipe
5. Expand the port
• Expand the port with an expander.
Note:
"A" varies according to the diameter, please refer to
the chart below:
Outer diameter
(mm)
A (mm)
Max
Min
Φ 6 - 6.35 (1/4’’)
1.3
0.7
Φ 9.52 (3/8’’)
1.6
1.0
Φ 12 - 12.7 (1/2’’)
1.8
1.0
Φ 15.8 - 16 (5/8’’)
2.4
2.2
6. Inspection
• Check the quality of the expansion. If the surface
is not smooth, repeat the previous steps.
expander
pipe
hard
mold
smooth surface
the length is equal
improper expanding
leaning
crack
damaged
surface
uneven
thickness
