Temperature Proportional Band—Adjusts the activation points of compressors or rate of change based
on the actual sensor values deviation from setpoint. The smaller this number the faster the compressors
and valve(s) will increase capacity. Too small of a number may cause the unit to short cycle the
compressors or excessively reposition the valve. This parameter is adjustable from 1.8to54.0°F (1.0 to
30.0°C). The factory default setting is 7.0°F (3.9°C).
Temperature Integration Time—Temperature integration takes into consideration the amount of time
the actual temperature has deviated from the setpoint. The larger this deviation is the longer the unit will
wait before corrective action is taken to achieve the setpoint. This parameter is adjustable from 0 to 15
minutes. The factory default is 0.
Temperature Derivative Time—Monitors the rate of change and will reduce or increase the amount of
corrective action based on the actual temperature increasing or decreasing toward the temperature
setpoint. This parameter is adjustable from 0-900 seconds. The factory default is 0.
Dewpoint Margin—Selects the difference between the room dew point and the refrigerant temperature
control point. This parameter is adjustable from 4.0 to 10.0°F (2.2 to 6.0°C). The factory default setting is
4.0°F (2.2°C).
Minimum Control Point—Sets the minimum supply refrigerant temperature the Liebert XDC will maintain.
This parameter is adjustable from 10 to 80°F (5.0 to 27.0°C). The factory default is 55°F (12.8°C).
Min Percent Cooling Setpoint—Selects the lowest percent call for cooling during normal operations.
Whenever the unit is not in startup mode or OFF, the percent call for cooling cannot go below this value.
The parameter is adjustable from 5 to 30%. The factory default is 5%.
Figure 6.19 Maintenance
Maintenance Frequency Per Year—Sets the number of expected maintenance visits in a one year time
span.
Max Bonus—Increases the time until the next required maintenance. A bonus should be assigned when a
service visit finds that all components are working optimally.
Vertiv | Liebert® XDC™ User Manual | 82
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