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iCOM
Controls Training and Service Manual
Chapter 1
Temperature and Humidity
Control Programs
This section provides details on how your Liebert iCOM control responds to the
user programmed inputs values and room conditions. Refer to this section when
you need specific information control operation. This section includes details on
four (4) user selectable temperature control programs and two (2) user selectable
and humidity control programs.
Cooling and/ or Heating Required, in Percent (%)
The temperature control programs for the iCOM microprocessor is based on a
calculated percent (%) requirement for cooling and/ or heating. This percent (%)
requirement is determined by the control type (algorithm) selected by the user.
The four (4) user selectable temperature control programs are:
• Intelligent
• Proportional (P)
• Proportional + Integral (PI)
• Proportional + Integral + Derivative (PID)
Temperature Control Program Types
Intelligent Control – Factory Default Setting
The Intelligent Control operates from a set of general rules that defines how the
control output should be adjusted for different system conditions. The rules are
designed to duplicate the actions that an experienced human operator would take
if manually controlling the system.
Basically, this is done in a three-function process that differs from earlier
mathematically defined strict type data, hence, fuzzy logic. The on and off, true or
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