Piping
67 Liebert
®
SRC™ User Manual
4. Set-up the purging-hose connections, Figure 5-40.
Figure 5-40 Evacuation set up
5. Do a leak test per 5.5.1 - Piping Leak Test.
• A successful leak test must be completed before beginning evacuation.
6. Refer to 5.5.2 - Evacuation to complete the purge process.
5.5.1 Piping Leak Test
Perform the leak test by pressurizing nitrogen gas to 550 psi on both the liquid and gas pipes. Test with the
piping service valves closed. if the pressure does not drop for 24 hours, the system passes the test. It the
pressure drops, there is a nitrogen leak in the system. Find the leak, repair it, and test again.
WARNING
Risk of using combustible gases. Can cause explosion and fire resulting in building and equipment
damage, serious injury or death.
Do not use combustible gases, including oxygen for leak detection. Use only inert gas (nitrogen)
when checking plumbing leaks, cleaning or repairing pipes, etc.
Outdoor Unit
Lo Hi
Manifold Valve
Vacuum Pum p
Charge Hose
Pressure
Gauge
Lo=Open
Hi=Close
Indoor Unit
Piping Bundl e
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