328 080000 01 79
Specifications subject to change without notice.
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
S Confirm the pipe length according to the distance of the
indoor and outdoor units.
S Cut the required pipe with a pipe cutter.
Pipe
Pipe cutter
Leaning Uneven Burr
Fig. 72 - Cut the pipe
b. Remove the burrs
S Remove the burrs with a shaper and prevent the burrs from
entering the pipe.
c. Put on a suitable insulating pipe.
Downwards
Pipe
Shaper
Fig. 73 - Remove the burrs
d. Put on the union nut.
S Remove the union nut on the indoor connection pipe and
outdoor valve; install the union nut on the pipe.
Union pipe
Pipe
Fig. 74 - Put on the union nut
e. Expand the port.
S Expand the port with an expander.
NOTE: “A” is different according to the diameter, refer to Table 37.
Table 37—A
OUTER DIAMETER (mm)
A(mm)
Max Min
φ6−6.35 (1/4”)
1.3 0.7
φ9.52 (3/8”) 1.6 1.0
φ12−12.70(1/2”) 1.8 1.0
φ16−15.88 (5/8”) 2.4 2.2
Expander
Hard
mold
Pipe
Fig. 75 - Expand the port
f. Inspection
S Check the quality of the expanding port. If there is any
blemish, expand the port again according to the steps above.
The len
th is e
ual
Improper expanding
leaning
damaged
surface
crack uneven
thickness
Smooth surface
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