Pipe Expanding Method - Gree GWC09MB-D3DNK Series Owner's Manual

34

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 to
the distance of indoor unit and
outdoor unit.
• Cut the required pipe with pipe cutter.
pipe
B: Remove the burrs
• Remove the burrs with shaper and
prevent the burrs from getting into
the pipe.
downwards
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.
pipe
pipe cutter
leaning uneven
pipe
shaper
union pipe
E: Expand the port
• Expand the port with expander.
Note:
• "A" varies according to the
burr
diameter, please refer to the
sheet below:
Outer diameter
(mm)
(mm)
(mm)
6-6.35(1/4") 6-6.35(1/4")
(mm)
(mm)
9.52(3/8")
12-12.7(1/2")
15.8-16(5/8")
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
hard
mold
expander
A (mm)
A(mm)
(mm) A(mm)
A(mm)
Max
Max
A(mm)
A(mm)
1.3
Max
Max
1.3
Max
Max
1.3
1.6
1.3
1.6
1.3
1.3
1.6
1.6
1.8
1.8
1.6
1.6
1.8
1.8
2.4
2.4
1.8
1.8
2.4
2.4
2.4
2.4
improper expanding
leaning damaged crack
surface
pipe
Min
Min
0.7
Min
Min
0.7
Min
Min
0.7
1.0
0.7
1.0
0.7
0.7
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
2.2
2.2
1.0
1.0
2.2
2.2
2.2
2.2
uneven
thickness