ESIE16-02K
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Part 3. Repair
3.1. Refrigerant repair procedures
Page 64
31/05/21
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Version 1.1
RA R32 Split & multi split M-Series
3.1.4. Piping repair procedures
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Make sure to cover open pipe ends during repair work so no dust or moisture can enter.
•
Make sure to re-apply insulation removed during repair.
•
Pipe expansion / flare making:
-
Remove any burrs on the cut surface and use correct tool such as reamer or scraper (note that excessive deburring can
thin the pipe walls and cause cracking of the pipe).
-
Make sure the flare has the correct size (use a flare gauge).
-
Make sure no particles remain in the piping.
-
Apply just a drop of refrigerant oil on the inner surface of the flare.
-
Make sure the flare connection is tightened with the correct torque (torque values refer to installation manual).
• Brazing:
-
Use correct brazing tool.
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Use a phosphor copper filler metal (silver composition of 0 to 2%). Do not use flux material.
-
Flush the piping before brazing with nitrogen to avoid oxidation of the inside of the copper tubes (nitrogen purity
≥
99,99%).
