Emerson Liebert iCOM Manual De Usuario

S146 Fan Control Sensor—Controls the fan speed for modulation. Options for this setting are 

Supply, Return, Remote, and Manual Mode.
If manual mode is selected, then the fan speed can be controlled from the local display or through a 

building management system.
S147 Fan Setpoint—Activated when a temperature sensor is being used to control the fan speed. If 

the same sensor is used for temperature control and fan speed control, then this value will reflect the 

same setpoint as the temperature control setpoint. Manual mode uses the Fan Speed STD for control. 
S148 Fan Temp Control Type—Sets the type of control the unit will use to control fan speed.

PI controls gain is set in the Temp Prop / Integral parameter.
PI control will operate the fan speed so that the actual temperature of the fan control sensor is 

equal to the fan temp setpoint. If proportional only is selected, the fan will change “ONLY” based 

on the deviation from setpoint which will allow the actual temp to settle higher than setpoint. 

S149 Fan Temp Prop/Integral—Adjusts the fan speeds rate of change based on the actual sensor 

values deviation from setpoint. The smaller this number, the faster the fans will increase speed. 

Entering a number that is too small may cause the fans to increase and overshoot setpoint.

Temperature Integration Time—Adjusts the fans of the unit based on time away from setpoint so 

that accurate temperature control can be maintained. The proportional and integral work 

together to maintain setpoint. Large P-Band with Small I-Time is typical to achieve a stable 

control.

S150 Fan Deadband—Avoids overshooting and undershooting the setpoint. The value in this field 

will be split in half by the fan speed setpoint.
S151 Airflow Calibration—Defines the maximum voltage output at 100% fan speed. The default 

value is 10.0V. The value is commonly used when the unit airflow is tested and balanced. If the 

airflow is too high, the value displayed can be lowered to match design. This value cannot be set above 

the Analog Output High Limit or below the Analog Low Limit for the fan set in the Advanced Menu. 
Caution must be taken when lowering the airflow calibration value. Setting it too low may cause 

excessive condensation, coil freezing and other problems. Contact your local Emerson distributor with 

any questions.
S152 Fanspeed Min/STD—Sets the range for the variable fans. Min sets the minimum speed that 

the fan will operate at. Fan speed is modulated between the MIN and STD based on which sensor is 

set to control, setpoint and the PI settings. If the controlling sensor is set to manual, then the STD 

setting will control the current fan speed and the Min value is hidden. This parameter is also 

adjustable through the BMS.