LG ARUM072BTE5 Installation Manual page 115

3. Operate the vacuum pump and evacuate the system to the 2,000 micron level. Isolate the pump by closing the manifold gauges and the
vacuum pump valve, and then watch the micron level. Micron level may rise a bit, but MUST eventually stop rising for fifteen (15) min-
utes.
• If the micron level DOES NOT stop rising, there is a leak, and the leak test must be performed again.
• If the micron level DOES rise above 2,000 micron, re-open the manifold gauges and the vacuum pump valve and continue evacuation
back down to 2,000 micron level.
• If the micron level holds at 2,000 micron, continue to step 4.
4. Break vacuum with 50 psig nitrogen purge for an appropriate amount of time (this is to "sweep" moisture from piping).
5. Purge nitrogen from the system until the pressure drops down to 1 to 3 psig.
6. Evacuate to 1,000 micron level. Isolate the pump by closing the manifold gauges and the vacuum pump valve, and then watch the micron
level. Micron level may rise a bit, but MUST eventually stop rising for fifteen (15) minutes.
• If the micron level DOES NOT stop rising, there is a leak, and the leak test must be performed again.
• If the micron level DOES rise above 1,000 micron, re-open the manifold gauges and the vacuum pump valve, and continue evacuation
back down to 1,000 micron level.
• If the micron level holds at 1,000 micron, continue to step 7.
7. Break vacuum with 50 psig nitrogen purge for an appropriate amount of time.
8. Purge nitrogen from the system until the pressure drops down to 1 to 3 psig.
9. Evacuate to static micron level ≤500.
10. Micron level must remain ≤500 for 24 hours. If the vacuum gauge rises and stops, the system may contain moisture, therefore, it will be
necessary to repeat the steps of vacuum break and drying.
11. After maintaining the system in vacuum for 24 hours, check if the vacuum gauge rises or not. If it doesn't rise, then the system is properly
evacuated.
12. Close manifold gauges.
13. Shut the valve before turning off the vacuum pump.
If the outdoor unit is moved to and installed in another site, only charge with new refrigerant after successful leak test and triple evacuation proce-
dures have been performed. If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit
may be damaged.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Triple Evacuation Procedure
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