LG LA090HYV3 Installation Manual page 63

Triple Evacuation Procedure Steps
1. If this procedure is performed shortly after the leak / pressure test, the cap and core on the gas (vapor) suction Schrader port must have
already been removed, and the manifold must already be connected. If the procedure was not performed shortly after the leak / pressure
test, make sure to remove the cap and core on the gas (vapor) suction Schrader port. Verify that the service valves on the outdoor unit
are closed, and the stem head access caps are tight.
2. Connect the gauge manifold along with the vacuum pump to the gas (vapor) suction Schrader port (with core removed) using a vacuum
hose. Open the gauge manifold and the vacuum pump valves.
and the equipment must be replaced.
3. Operate the vacuum pump and evacuate the system to the 2,000 micron level. Isolate the pump by closing the manifold gauges and the
• If the micron level DOES NOT stop rising, there is a leak, and the leak test must be performed again.
• If the micron level DOES rise above 2,000 micron, re-open the manifold gauges and the vacuum pump valve and continue evacuation back
down to 2,000 micron level.
• If the micron level holds at 2,000 micron, continue to step 4.
4. Break vacuum with 50 psig nitrogen purge for an appropriate amount of time (this is to "sweep" moisture from piping).
5. Purge nitrogen from the system until the pressure drops down to 1 to 3 psig.
6. Evacuate to 1,000 micron level. Isolate the pump by closing the manifold gauges and the vacuum pump valve, and then watch the micron
level. Micron level will rise a bit, but MUST eventually stop rising for fifteen (15) minutes.
• If the micron level DOES NOT stop rising, there is a leak, and the leak test must be performed again.
• If the micron level DOES rise above 1,000 micron, re-open the manifold gauges and the vacuum pump valve, and continue evacuation back
down to 1,000 micron level.
• If the micron level holds at 1,000 micron, continue to step 7.
7. Break vacuum with 50 psig nitrogen purge for an appropriate amount of time.
8. Purge nitrogen from the system until the pressure drops down to 1 to 3 psig.
9.
10.
will be necessary to repeat the steps of vacuum break and drying.
11. After maintaining the system in vacuum for two (2) hours, check if the vacuum gauge rises or not. If it doesn't rise, then the system is
properly evacuated.
12. Close manifold gauge.
13. Shut the valves before turning off and disconnecting the vacuum pump.
FINAL INSTALLATION PROCEDURES
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.
Triple Evacuation Procedure
63