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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
Perform Pump Down procedure in the Cooling Only mode.
Pump Down Procedure
This procedure is performed when the refrigerant piping system is serviced. Pumping down collects all the refrigerant in the outdoor unit
without losing any charge. Always adhere to and be familiar with local codes regarding the handling of refrigerant.
The system must operate in Cooling Only mode to proceed with the pump down procedure. If needed, refer to the previous sections for prop-
er steps to place the unit into Cooling Only mode.
1. Turn off the unit’s power switch. Connect a low-pressure gauge manifold hose to the charge port on the gas (vapor) suction service
valve.
2. Open the gas (vapor) suction service valve halfway, and purge the air in the manifold hose using the refrigerant.
3. Fully close the liquid piping service valve.
4. Turn on the unit’s power switch and start the Cooling Only mode operation.
5. Observe the pressure gauge reading. When it changes 14.2 to 7.1 psig, fully close the gas line valve and then immediately turn the unit
off. Pump down procedure is complete and all refrigerant will be collected into the outdoor unit.
•
Never inhale or handle refrigerant directly. Doing so will cause bodily harm and injury.
• After pump down, power must be turned off before the hose is removed. If the system is operated without the hose connected, air inside the
compressor will cause the pressure to increase, and possibly cause an explosion and physical injury.
Pump Down Procedure
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