Temperature Proportional Band
Adjusts the activation point of cooling components based on deviation from setpoint by placing half of the selected
value on each side of the temperature control setpoint. A smaller number causes faster reaction to temperature
changes.
NOTE: Setting this too low causes short cycling of compressors.
Temperature Setpoint
Temperature that the unit maintains via cooling.
Temperature Setpoint Act
Read-only display of adjusted temperature setpoint when one of the following is active:
• Temperature compensation
• BMS backup temperature setpoint
3.1.3 Temperature Control –TemperatureSetpointsandCooling Operation
Temperature control refers to the cooling unit’s response to programmed setpoints and sensed room/load conditions.
Temperature control is closely tied to the primary cooling source. Liebert® thermal management units employ several
types of primary cooling sources:
Compressor Operation
iCOM controls the cooling units based on a calculated need for cooling (and heating, if included on your system). The
requirement is expressed as a percentage and is calculated using the selected temperature control type.
Temperature Proportional Band
Use the proportional and dead band parameters to control how your cooling unit(s) respond based on the calculated need
for cooling (or heating). Figure 3.1 on the next page, illustrates temperature control using:
• 70° setpoint
• 10° proportional band
• No deadband
The proportional band is divided evenly on each side of the setpoint.
• 0% cooling capacity is required at 70°.
• As the air temperature increases, cooling also increases along the proportional band.
• Ifthe air temperature reaches 75°, the system operates at cooling capacity.
• If air temperature rises to the end of the proportional band or further, the system operates at 100% capacity to
bring the temperature down to the setpoint.
3 Service Operation
21
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