57
Technical Information
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 pipe
• Confirm the pipe length according to the distance of indoor
unit and outdoor unit.
• Cut the required pipe with pipe cutter.
B. Remove burrs
• Remove the burrs with shaper and prevent the burrs from
getting into the pipe.
C. Put on suitable insulating pipe
D. Put on union nut
• Remove union nut on the indoor connection pipe and
outdoor valve; install the union nut on the pipe.
E. Expand the port
!
Note:
• “A” is different according to the diameter, please refer to
the sheet below:
Outer diameter(inch
A(inch)
Max
Min
Ф
0.24 - 0.25 (1/4”)
0.05
0.03
Ф
0.37 (3/8")
0.06
0.04
Ф
0.47 - 0.50 (1/2”)
0.07
0.04
Ф
0.63 - 0.625 (5/8”)
0.09
0.09
F. Inspection
• Check quality of the expanding port. If there is any
blemishes, expand the port again according to the steps
above.