LG LGRED LH188HHV1 Installation Manual page 72

FINAL INSTALLATION PROCEDURES
Setting LUU180-240HHV Optional Modes
LUU***HHV Optional Modes, continued.
Pump Down
Use Pump Down mode when adding refrigerant.
1. Shut the power OFF to the system.
2. Remove the control box cover.
3. Set DIP Switch No. 1 to ON according to the system installed as
shown.
4. Turn the power ON.
5. The red and green LEDs on the outdoor unit PCB will light up
as detailed below, indicating the indoor unit is in Pump Down
mode.
6. After Pump Down mode is complete, the red LED will turn OFF. If
Pump Down is not performing normally, the red LED will blink.
Pump Down Flowchart
Verify Power is OFF.
Set DIP Switch No. 1 to ON for Pump Down mode.
Turn the Power ON.
The red LED will be ON; the green LED will be OFF.
The Compressor turns ON.
The red LED will be ON; the green LED will be ON.
Pump Down Starts.
The red LED will be ON; the green LED will be OFF.
Pump Down Completes.
The red LED will be OFF; the green LED will be ON.
Turn the Power OFF.
The red LED will be OFF; the green LED will be ON.
• When the green LED is ON, the compressor will be OFF because of low pressure in the system.
• After Pump Down is finished, ensure the power is OFF, and set DIP Switch No. 1 to OFF for Normal Operation (all DIP switches must be set
to OFF for Normal Operation). Turn the power back ON to resume system operation.
• An improper Pump Down procedure will cause the system (along with the red and green LEDs) to shut off within twenty (20) minutes from
the initial start.
72
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.
Figure 92: LUU180HHV and LUU240HHV Pump Down DIP Switch
Settings.
1 2 3 4
Liquid Valve Closed.
Close the liquid valve only after the green LED
turns OFF (about seven [7] minutes after the
system starts), and then close the vapor valve
Vapor Valve Closed.
after the green LED turns ON.
5 1 2