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ESIE17-19C
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Part 3. Repair
C
AUTION
Refer to Installer Reference Guide for 'Pump down operation' procedure.
3.
After 5-10 min (after only 1-2 min in case of very low Ta < -10°C), close the liquid stop valve with a hexagonal wrench.
4.
Check on manifold if vacuum is reached, close gas stop valve and forced cooling operation.
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.
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Make sure to re-apply insulation removed during repair.
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Pipe expansion / flare making:
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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).
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Make sure the flare has the correct size (use a flare gauge).
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Make sure no particles remain in the piping.
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Apply just a drop of refrigerant oil on the inner surface of the flare.
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Make sure the flare connection is tightened with the correct torque (torque values refer to installation manual).
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Brazing:
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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.
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Flush the piping before brazing with nitrogen to avoid oxidation of the inside of the copper tubes (nitrogen purity ≥ 99,99%).
Page 68
Optimized Heating 4
3.1. Refrigerant repair procedures
19/08/19
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Version 1.1
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