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When Using Copper Pipework - Mitsubishi Electric R410A Manual

Refrigerant
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When using
copper
pipework
>
Use only copper pipes with the correct wall thickness -
please refer to your usual copper pipe supplier for detail
>
Make sure you cut the copper pipe with a proper pipe cutter only
>
Remove any burrs with the utmost care
>
Make sure that no swarf or other impurities get into the piping
>
When brazing make sure that Nitrogen (OFN) is used at all times
>
Brazed joints must be bare and clean
The impor tance of correct
Brazed joints should only be made using Nitrogen
(OFN) as without it carbon deposits are left on the
pipe surface. The carbon deposits are then washed
off of the surface of the pipe when the refrigerant
is circulated and it then travels with the
refrigerant.
Carbon deposits can cause the refrigerant
and refrigeration unit oil to decompose.
This is likely to result in operation
defects and warranty will become null
and void.
brazing
Page 11

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