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VI. Installation instructions
4-2 Flared pipe processing
Defect in flared pipe processing will be a major cause of gas leak. Please
carry out flared pipe processing properly according to the following method:
1
Cut off tube
Use pipe cutting machine to cut off copper tubes correctly.
2
Deburring
Completely remove the burr on cut-off section of the pipe.
To prevent burr from dropping into the pipe, the cut off
opening of pipe line should be positioned downwards
during deburring operation
3
Assemble the nut
Remove the conical nut attached to indoor and outdoor unit, and
then fix them inside the pipes free of burr.
(After flared processing of pipe, it is impossible to fix them inside it.)
4
Flared pipe processing
Carry flaring process by the tools listed below.
Outer diameter
6.35mm
9.52mm
12.7mm
15.88mm
5
Check
Compare the flared shape to the right Figure.
If visible defect exists in flaring process, just
cut off the processed section, and flare it
again.
A(
mm
)
2.0--2.5
3.0--3.5
3.5--4.0
4.0--4.5
Uniform peripheral length
Installation & Maintenance Manual
90
Copper pipe
Burr
Conical nut
Tools for flaring process
Tongs
Smooth inner side free of scratch
Smooth periphery
Too much
24
Poor
Good
Declined cutoff opening
Reamer-type pipe cutter
Copper pipe
York tongs
Conical nut
Copper pipe
Flared surface
Inclined
With cracks
with scratch
Poor sample
Burr
Uneven
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