Pump Down Procedure - LG LS243HLV Installation Manual

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.
•
• 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
Perform Pump Down procedure in the cooling only mode.
FINAL INSTALLATION PROCEDURES
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Pump Down Procedure
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