Vertiv Liebert iCOM User Manual

3.1.9 Humidity Control
Humidity control refers to the cooling unit’s response to programmed setpoints and sensed humidity conditions.
Vertiv™ Liebert® iCOM™ controls humidity based on temperature and humidity sensor readings. The requirement is
expressed as a percentage and is calculated using the selected humidity control type.
Humidity Proportional Band
Use the proportional and dead-band parameters to control how your cooling unit(s) respond based on the calculated need for
humidification/dehumidification. As the return air humidity deviates from the humidity setpoint, Liebert® iCOM™ responds
with a humidification or dehumidification capacity of 0% to 100% in 1%increments.
Figure 3.11 below , illustrates humidity control using:
• 50% setpoint
• 8% proportional band
• No deadband
The proportional band is divided evenly on each side of the setpoint.
• 0% humidifying capacity is required at the humidity setpoint.
• The humidifier starts operating when the humidification requirement reaches 100% and continues to operate
until the humidification requirement drops to 0%. During this period, the display shows 100% humidification
• The dehumidifying capacity responds in the same way as the return-air humidity rises above the setpoint.
Dehumidification is accomplished by a request for cooling that activates as soon as the required dehumidifying
capacity reaches 100% and continues operating until the required dehumidifying capacity drops to 0%. During
this period, the digital compressor loading scales between a minimum percentage (advanced setting is A557)
and 100% depending upon required dehumidifying capacity. The display always shows 100% dehumidification.
Figure 3.11 Humidity Control without a Deadband
No. Description
1 ½ of proportional band.
2 ½ of proportional band.
3 Service Operation
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Vertiv™ Liebert® iCOM™Installer/User Guide

Vertiv Liebert iCOM Specifications

General

Brand	Vertiv
Model	Liebert iCOM
Category	Control Unit
Language	English