Appendix 3: Pipe Expanding Method - Gree GWH07QA-K6DNC4A 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(mm)
Ф6 - 6.35 (1/4")
Ф9 - Ф9.52 (3/8")
Ф12 - 12.70 (1/2")
Ф16 - 15.88 (5/8")
F:Inspection
● Check the quality of expanding port. If there is any blemish, expand the port
again according to the steps above.
178
A(mm)
Max Min
1.3 0.7
1.6 1.0
1.8 1.0
2.4 2.2
Pipe
Pipe cutter
Leaning Uneven
Pipe
Downwards
Union pipe
Pipe
Hard
mold
Expander
Smooth surface
Improper expanding
damaged
leaning
surface
The length is equal
Installation and Maintenance
Service Manual
Burr
Shaper
Pipe
crack uneven
thickness