Emerson Liebert iCOM User Manual download pdf (Page 135)

Service Menu Parameters

125 Liebert

iCOM

Figure 106 Setpoints screen, page 3 of 9

S124 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 Liebert

iCOM will calculate the corresponding RH% based on that sensors actual temperature. The Range is

Remote or Return Sensor. The factory default setting is Return Sensor.

S125 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 factory default setting is 50%.

S126 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. The factory default setting is “Predictive” (see 3.7.2 - Humidity Sensor

Reading Control Types).

S127 Humidity Proportional Band—Adjusts the activation points of the humidifier and

compressors based on the actual sensor values deviation from setpoint. The smaller this number, the

faster the compressors and humidifier will increase capacity. Too small of a number may cause the

unit to short cycle or overshoot setpoint.

S128 Humidity Integration Time—Adjusts the capacity of the unit based on time away from

setpoint so that accurate humidity control can be maintained. If the integration time is set to 0, the

humidity control operates as a “proportional only” control. When an integration time is set, the

control mode changes to “PI” control.

S129 Humidity Deadband—Prevents overshooting of the setpoint and cycling between

humidification and dehumidification. The value entered in this field will be split in half by the

temperature setpoint.

S130 Dehum Temp Act/Set—Allows for a target temperature setpoint to be activated when a call

for dehumidification is enabled instead of the traditional method of overcooling the space by

increasing cooling to 100% and lowering fan speed if equipped. Must be in supply air control mode.

When a call for dehumidification is active, the supply or remote sensor setpoint will be lowered to this

parameter. This parameter should be set below the accepted dew point threshold of your space.

Used only when supply dehumidification is enabled.

NOTE

When the unit is in relative humidity control, only the right side of the menu is displayed and

dew point will display the left side of the menu.

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Emerson Liebert iCOM User Manual Page 135