Pump Down, Cooling Only Mode - LG Art Cool Premier LA120HYV1 Installation Manual

Never air purge with refrigerant as it can lead to refrigerant leakage which can cause bodily harm and injury, especially if inhaled.
Use a vacuum pump that can evacuate down to 500 microns.
1. If moisture remains in the piping after the system is evacuated for two (2) hours, break the vacuum (down to 7.5 psi with nitrogen gas).
2. Evacuate the system again with the vacuum pump for at least one (1) hour to 500 microns.
3. If the system does not reach 500 microns within two (2) hours, repeat the vacuum break and evacuation procedure until the gauge does
not rise.
Pump Down Procedure
This procedure is performed when a unit has to be relocated or the refrigerant circuit is serviced. "Pumping down" is a term used to mean
collecting all refrigerant into the outdoor unit without the loss of any refrigerant. Follow the procedure and guidelines below to safely collect
refrigerant back into the outdoor unit. Always adhere to and be familiar with local codes regarding the handling of refrigerant.
The system must be placed in Cooling mode in order to proceed with the pump down procedure.
1. Place the system in cooling mode. If needed, refer to the section
below for proper steps to place the unit into Cooling Mode.
2. Connect a low-pressure gauge with manifold hose to the charge
port on the gas line service valve.
3. Open the gas line service valve halfway.
4. Purge the air in the manifold hose using the refrigerant.
5. Close the liquid line service valve all the way.
6. Turn on the unit's power switch and start the cooling mode
operation.
7. Observe the pressure gauge reading. When it gets to 1 to 0.5 kg/
cm2G (14.2 to 7.1 P.S.I.G), fully close the gas line valve and then
immediately turn the unit off.
• Pump down procedure is complete at this time and all refrigerant
should be collected into the outdoor unit.
Enabling Cooling Only Mode
Before performing the Pump Down procedure, the system must be in
Installer Mode and then must be placed into Cooling Only Mode.
1. Turn off the IDU by pointing the IDU wireless controller at the
IDU infrared receiver and press the OFF button on the wireless
controller.
2. Simultaneously press the recessed Reset button (small hole) and
the JET MODE buttons.
3. To activate Cooling Only mode, set the code to 45 on the wireless
controller display and press the Power-ON button.
4. The IDU should beep to acknowledge that code has been
received.
5. Remove system power at the ODU power circuit breaker. Wait for
a minimum of 30 seconds.
6. Reapply power to the system at the ODU power circuit breaker.
REFRIGERANT PIPING CONNECTIONS
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Pump Down, Cooling Only Mode

Do not inhale or handle refrigerant directly. Doing so may cause
bodily harm and injury.
Perform Pump Down procedure only in the cooling mode.
Disabling Cooling Only Mode
After the Pump Down procedure is successfully completed, disable
Cooling Only Mode to enter normal operating mode. Follow the
procedure below.
1. Turn off the IDU by pointing the IDU wireless controller at the
IDU infrared receiver and press the OFF button on the wireless
controller.
2. Simultaneously press the Reset button (small hole) and JET
MODE buttons.
3. To deactivate Cooling Only mode, set the code to 46 on the
wireless controller display and press the Power-ON button.
4. The IDU should beep to acknowledge that code has been
received.
5. Remove system power at the ODU power circuit breaker. Wait for
a minimum of 30 seconds.
6. Reapply power to the system at the ODU power circuit breaker.
• Once the system is in Installer Mode (with Cooling Only Mode initi-
ated), automatic operation is suspended.
• Once Cooling Only Mode is disabled, the unit will return to normal
operation.
• Installer Code cannot be entered if the indoor unit is running. The
indoor unit must be powered off.
• WLAN Module's communication time will lag by about 1 minute after
unit is turned back on and in normal operating mode.
• Entire lock or Mode lock cannot be set if you set heating or automat-
ic operation through the central controller.
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