Emerson Liebert iCOM, Manual

Page: 99 / 172

User Menu Parameters
91 Liebert
®
iCOM
®
for Liebert DSE
™
U102 Temperature Setpoint —Selects a temperature that the cooling unit will maintain by
applying cooling and or reheats. There are two values in this field. The Temp Set value is the
temperature that has been set by the user to control the temperature. The Temp Act value is a read
only value that indicates if another routine, like supply compensation has internally modified the
Temp controlling value. If compensation has not been activated, then ACT and SET will always
match. This parameter is adjustable from 41-104°F (5-40°C). The default value for Supply is 64°F.
The default value for Return & Remote=73°F.
U103 Temperature Control Sensor —Selects the sensor that will control the cooling capacity.
Cooling capacity is either the Chilled Water Valve, Compressor, FreeCooling Valve or Air
Economizer. Unloading type compressors can be set to any sensor type, however fixed style
compressors can only be set to Return or Remote control type l. This parameter can only be changed
in the service menu. The range should be Supply, Return or Remote Sensor. The default setting is
Return.
U104 Humidity Setpoint —Selects a humidity that the cooling unit will maintain by removing or
adding moisture to the air. The humidity setpoint will either be set in percent RH or as a Dew Point
Value depending on what the humidity control type is set for. This parameter is adjustable from 20-
80%. The default setting is 50%.
U105 Humidity Control Sensor —Defines which humidity value the humidity setpoint is compared
with. The return sensor is equipped with a Temp / Hum sensor and can calculate the dew point based
on iCOM's internal lookup table. If a sensor other than the return sensor is selected, then iCOM will
calculate the correct RH% based on the sensor selected and its actual temperature. The range is
Remote or Return Sensor. The default setting is Return Sensor.
U106 Humidity Control Type —Selects the humidity control calculation. Setting this parameter to
“Relative” will control the humidity without considering any temperature deviations. “Predictive” and
“Absolute” control consider the temperature deviation from temperature setpoint so that a constant
level of moisture is kept in the area based on the humidity sensor reading and the temperature
deviation from setpoint.
Dew Point allows Liebert iCOM to calculate the actual dew point of the room and to control the
humidity based on a user-entered dew point temperature. The range is Relative, Absolute, Predictive
and Dew Point. The default setting is Predictive.
U107 Fan Setpoint— Needed anytime the fan operates from a different sensor than the temperature
setpoint. Example: The temperature setpoint is set to Supply Air and the fan control is set to Remote
Sensor.
This is considered “Optimized Aisle” control, which decouples the fan and cooling capacity
modulation. In the above example, this value would set the remote sensor setpoint to control the fan
speed. This parameter is adjustable from 41-104°F (5-40°C). The default setting is 73°F.
U108 Fan Control Sensor— Determines the sensor which will control the speed of the fan. This
parameter works in conjunction with the Fan Control Setpoint.
The Liebert iCOM control also has the ability to control the fan speed manually. This means that the
fan control can be set through the local Liebert iCOM display or via a building management system
through one of the various Liebert IntelliSlot
®
monitoring cards. The range is Supply, Return, Remote
or Manual. The default setting is Return Sensor.
U110 Optimized Aisle Enabled— This read-only value indicates if the Liebert iCOM controller is
setup in a Optimized Aisle configuration.
To enable optimized aisle within Liebert iCOM, the Supply Air sensor must be set to control the
cooling capacity and the remote sensor must be set to control the fan speed. This allows the cooling
unit to maintain inlet rack temperatures while still maintaining an even under-floor air temperature
when controlling unbalanced rooms.
Optimized Aisle will automatically adjust based on the application (None, End or Full Containment).