The remote 2T sensors required for this feature shall monitor cold aisle temperatures while fan speed is driven by the return
air sensor and corresponding setpoint. As the remote temperature increases above the Fan Temp Comp – Remote Setpoint,
fan speed control setpoint (return air setpoint) shall begin to decrease starting with 0⁰F/0.0K adjustment when at the remote
setpoint and ending with the maximum adjustment as defined by Fan Temp Comp – Adjust Band (i.e. Fan Temp Comp – Rem
Temp Setpoint + Fan Temp Comp – Rem Band). In the event the remote temperature sensor reading is considered invalid,
Liebert® iCOM™ shall fall back and use Fan Temp Comp – Rem Temp Backup value for control. When the remote temperature
is continuously above the sum of Fan Temp Comp – Remote Setpoint + Fan Temp Comp – Rem Band, the Fan Temp Comp
Limit alarm event shall annunciate after the defined delay time has surpassed.
• Fan Temp Comp – Operation – enables/disables Fan Temperature Compensation routine
• Fan Temp Comp – Rem Temp Setpoint – remote temperature threshold at which routine activates
• Fan Temp Comp – Rem Band – adjustment band
• Fan Temp Comp – Adjust Value – value subtracted from return temperature setpoint as remote temperatures
rise above
• Fan Temp Comp – Rem Temp Backup – remote temperature backup value which shall be used in the event
remote sensor values are considered invalid.
Figure 3.10 Fan Temperature Compensation
3 Service Operation
38
Vertiv™ Liebert® iCOM™Installer/User Guide
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