Evacuation; Vacuum Pump - LG Multi V ARUN053GF2 Installation Manual

Evacuate the system from the Space II unit's liquid and gas piping service ports (vacuum with both service valves closed).
• Use a vacuum pump that can evacuate down to 500 microns.
• Never air purge with refrigerant.
1. Evacuate for more than two (2) hours; bring the system to 500 microns. Maintain the system under 500 microns for one (1) hour, and
watch if the vacuum gauge rises. If the gauge rises, the system may contain moisture or may have a leak somewhere (water may have
entered the piping during a rainy period or if the installation took a long time to complete).
2. 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.
Then evacuate the system again with the vacuum pump for at least one (1) hour to 500 microns 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.
• If system refrigerant charge is not performed soon after the evacuation procedure is complete, humid air may access the Space II
unit and mix with the refrigerant, causing the refrigerant cycle to malfunction and damage the Space II unit.
• Do not charge the refrigerant when the compressor is operating. Liquid may infiltrate, causing the compressor to malfunction.
• The refrigerant cycle may malfunction or become damaged if unspecified refrigerants are mixed with the required refrigerant.
• Add an accurate amount of refrigerant charge; too much or too little refrigerant may cause the system to malfunction.
• The indoor unit EEVs may become damaged if the indoor units are turned off and on repeatedly without refrigerant in the lines.
• R410A is a mixed refrigerant, therefore, any additional refrigerant must be charged in its liquid state. If the refrigerant is charged in
its gaseous state, its composition changes and the system will not work properly.
Figure 38: Space II Unit Evacuation Procedure.

Vacuum Pump

refrIGerant PIPInG connectIons
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.

Evacuation

37