Evacuation - LG Central Air Conditioning Remote Condensing Unit Installation Instructions & Use And Care

LEAK TESTING
1. Close hand valves on gauge set.
2. Attach gauge hoses to service valve ports.
3. Keep service valves closed.
4. Connect nitrogen cylinder to center port on gauge set.
5. Open nitrogen cylinder valve slightly.
6. Open high pressure valve on gauge set.
7. Pressurize to 150 psig.
8. Close valve on nitrogen cylinder.
9. Apply soap solution on all connections and joints.
10. Mark bubble locations for repair.
11. Using gauge set, release nitrogen from system.
12. Repair leaks, if any.
13. Repeat leak test until there are no leaks.
EVACUATION (See Figure 6)
1. Close valves on gauge set.
2. Connect gauge hoses to service valve ports. (Service
valves on unit remain closed)
3. Connect vacuum pump to gauge set.
4. Start the vacuum pump.
5. Open the high and low pressure ports on the gauge
set.
6. Begin evacuation.
7. Vacuum pressure must pull down below 500 microns
in 2 minutes or less.
• If after 2 minutes the vacuum pressure does not
drop below 500 microns, go back to leak test.
8. Evacuate for thirty minutes.
9. Shut off valve to vacuum pump.
I 0. Wait ten minutes and read pressure.
• If pressure is below 1000 microns, system is ready.
• If pressure is between 1000 and 2000 microns,
continue evacuation for an additional 30 minutes.
• If pressure is above 2000 microns, there is a leak
in the system. Go back to leak test.
11. Shut off the pump.
12. Close valves on gauge set.
Low Side Gauge
And Valve
800 PSI Rated Hoses
To
Unit Service Valve Ports
Vacuum Pump
Adapter
Vacuum Pump
Disconnect For Charging
— 6 —
Gauge
Manifold
High Side Gauge
And Valve
Connect For
Charging Only
Charging Cylinder
And Scale
Fig. 6