Midea CSU 12HCAA, Installation And Maintenance Manual

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24
Installation & Maintenance Manual
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:
Burr Reamer-type pipe cutter
Copper pipe
90
Declined cutoff opening
Poor
Burr
Good
1
Cut off tube
Use pipe cutting machine to cut off copper tubes correctly.
2
Deburring
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
A( ) mm
2.0--2.5
3.0--3.5
3.5--4.0
Tongs
Conical nut
Copper pipe
York tongs
Tools for flaring process
5
Check
Smooth inner side free of scratch
Too much
Inclined
Flared surface
with scratch
With cracks
Uneven
Poor sample
Smooth periphery
Uniform peripheral length
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.
Conical nut
Copper pipe
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
15.88mm 4.0--4.5
VI. Installation instructions