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Single Zone Mega, Standard Eciency, and Mega 115V Wall Mounted Installation Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
FINAL INSTALLATION PROCEDURES
Deep Evacuation Procedure, continued.
3. Evacuate to static micron level ≤500 for at least one (1) hour.
4. Micron level must remain ≤500 for two (2) 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.
5. After maintaining the system in vacuum for two (2) hours, check if the vacuum gauge rises or
not. If it doesn’t rise, then the system is properly evacuated.
6. Close manifold gauges.
7. Shut the valves before turning off and disconnecting the vacuum pump.
Figure 104: Evacuation Procedure Diagram.
Outdoor Unit
Gauge Manifold
Vacuum Pump
Close
Indoor Unit
Refrigerant
Piping
Connected to
Shrader Valve
on Gas (Vapor)
Service Port
Vacuum Hose
Open
Micron
Gauge
Triple Evacuation Procedure
After the leak / pressure check is complete, it is a best practices recommendation that a triple
evacuation procedure is performed to the refrigerant piping and the connected indoor unit. Triple
evacuation must be performed through the gas (vapor) suction Schrader port on the outdoor unit
service port.
The deep evacuation procedure is required for Single Zone systems. The triple evacuation procedure is a
best practices recommendation for Single Zone systems.
For faster evacuation, the Schrader core can be removed, and an auxiliary service port can used. Make sure to re-install the original Schrader core
before operating the system.
• Evacuate through just the gas (vapor) suction Schrader port on the outdoor unit service port.
• The outdoor unit service valves must remain closed and the stem head access caps tight. Do not open the outdoor unit service valves
and release the factory refrigerant charge until trim charge is complete, and the system is ready to operate.
• Any field-installed ball valves in the refrigerant system (if used) must be open to ensure all piping is free and clear for evacuation on all
piping and connected indoor unit.
• Never perform evacuation using refrigerant.
• Use only a vacuum pump that can reach 500 microns, vacuum rated hoses or copper tubing, and a leak-free gauge manifold set.
• Use only new vacuum pump oil from a properly sealed (unopened) container, and change oil in pump before EVERY use.
• Subsequent oil changes will be necessary after several hours of continuous operation; have extra oil on hand.
• Use a quality micron gauge in good operating order and install as far away from pump as possible.
Deep Evacuation and Triple Evacuation Tests
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