LG LH098HV1 Installation Manual page 73

LUU180HV and LUU240HV 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 function
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 Comp 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 is Complete.
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 system low pressure.
• 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.
FINAL INSTALLATION PROCEDURES
Due to our policy of continuous product innovation, some specifications may change without notification.
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Setting LUU180-240HV Optional Modes
Figure 95: LUU180HV and LUU240HV Pump Down DIP Switch Settings.
Liquid Valve Closed.
The liquid valve will close only after the green
LED turns OFF (about seven [7] minutes after
the system starts). Vapor valve will closed after
Vapor Valve Closed.
the green LED turns ON.
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