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9.1. Piping and vacuuming process
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1. Brazing connection pipe
1-1. Check that cabinet EEV is completely opened.
1-2. Before brazing, insert 2bar nitrogen gas flow into pipe for preventing deposition
of any oxide film on the inner surface of the piping, and also avoid heating up
service valve by wet towel cover etc.
1-3. During brazing, be careful for burning insulation & any CDU components.
2. Leakage test
2-1. Power supply on CDU & wait 20 sec for initializing system.
2-2. Charge Nitrogen gas in 80bar or 55bar if using 60bar relief valve.
2-3. Check brazed part using leakage detector or leakage test liquid. (formability)
3. Vacuuming
3-1. Set R744(CO₂) manifold, vacuuming pump, CO₂ vessel, and CDU service port.
3-2. Connect CO₂ charge tube, vacuuming tube, and each equipment.
3-3. Check connector and each tube are closed tightly.
3-3. Loose service valve rod in middle position (3 way opening) before vacuuming.
3-4. Vacuuming for 2-3 hours inside pressure keeping -1bar(vacuuming status)
4. Setting parameter value
4-1. Change each loop parameter set depending on target evaporating temperature
during vacuuming process. (suction pressure default value 3,0MPa)
