If two or more outputs change state simultaneously, the Liebert AC8 begins a new countdown between
each output change of state.
The default is 6seconds (displayed as 00 MIN : 06 SEC).
To change the Restart Time settings:
• From the Setup Operation Menu, choose Restart, as shown at
right, and press Enter.
• To change the time delay in minutes and seconds (in the range
of 00:00 to 99:59):
• For minutes (MIN), press and hold one of the arrow keys to
scroll through the numbers 00-99.
• Press Enter to advance to seconds (SEC).
• For seconds (SEC), press and hold one of the arrow keys to
scroll through the numbers 00-59.
• When finished, press Enter again.
7.10.6 Specify Staging
Staging allows a standby device to be turned On when a sensor detects a monitored point reaching a
specified setpoint. The Liebert AC8 continues to turn On additional standby units, if available, at specified
intervals.
Staging also turns Off devices as the condition returns to normal. Devices are turned off in a last-on / first-
off order, triggered by decreases of half the specified sensitivity increment.
• The following example illustrates the staging process for a temperature sensor with a Target setpoint
of 70°F and a Sensitivity increment of 5°F.
Temperature Reaches Target Level: First Device Turned On
• When the temperature in Zone 1 reaches 75°F (target plus sensitivity), the Liebert AC8 turns On a
cooling unit that has been on standby.
Temperature Rises by Sensitivity Increments: Second & Third Devices Turned On
• When the temperature reaches 80°F—an additional 5°F—the Liebert AC8 turns On a second
standby cooling unit.
• If the zone has a third standby unit and the temperature rises another 5°F to 85°F, a third standby
unit is turned On.
Temperature Returns to Normal: Devices Turned Off
• When the temperature drops from 85°F to 82.5°F (a decrease of 2.5°F, half the sensitivity increment
of 5°F), the third unit is turned Off.
• When the temperature falls to 77.5°F, the second device is turned Off.
• When the temperature falls below 75°F, the first device is turned Off.
Vertiv | Liebert® AC8 User Manual | 100
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