Cooling Only Mode, Pump Down Procedure - LG ART COOL LA090HSV5 Installation Manual

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Engineering manual (60 pages)

Table Of Contents

Table of Contents

Enabling Cooling Only Mode

Before running the Pump Down procedure, the unit must be

switched to Cooling Only mode. To be able to run Cooling Only

mode, the unit must be changed to Installer mode (see previous

page for instructions).

1. Supply power to the system, but system must be OFF with all

functions inactive.

2. Enter the Installer mode.

3. Set code to 45.

4. Press ON / OFF button and select the code number 45. Unit will

beep to acknowledge that code has been received.

5. Turn off power for a minimum of 30 seconds.

6. Turn power back on to system.

• After the system is in Installer mode (with Cooling Only mode initiated), automatic operation is suspended.

• After Cooling Only mode is disabled, the system will return to normal operation.

• Installer mode cannot be entered if the unit is running. The system must be completely OFF.

• All Installer code numbers must be entered when system is OFF.

• WLAN Module's communication time will lag by about one (1) minute after unit is turned back on, and in normal operating mode.

• Entire lock or Mode lock cannot be set if heating or automatic operation is set through a central controller.

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 sections on the next page

for proper 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 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 may 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.

Perform Pump Down procedure in the Cooling Only mode.

FINAL INSTALLATION PROCEDURES

Due to our policy of continuous product innovation, some specifications may change without notification.