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iCOM
Control Training and Service Manual
Temperature
Set Point
Humidity
Set Point
Humidity
Proportional
Band = 6%
Content Level
Grains per LB.
75°F
50% +3% 59.2
75°F
50% -3% 52.5
The Absolute (Predictive) Humidity Control Flowchart shows what the program is
doing and why.
Programmed Values
Temp Set Point
Humidity Set Point
Humidit
y
Pro
p
ortional Band
Present
Room Temperature
Room Humidity
Calculates Band
Calculates Content
Humidif
y
Dehumidif
y
Compares
Moisture
Content to
Band and
Makes
Decision
The program can be analyzed using the Moisture Content Charts supplied in a
later chapter of this manual. It is important to remember that the display provides
the humidity value in %RH, not moisture content. The moisture content (grains)
values are used only in the internal control program calculation. The LCD display
will indicate relative humidity percentage for both methods of control. If the
absolute method of control is selected, the adjusted humidity reading will be
shown.
When utilizing the absolute (predictive) humidity control program feature,
the humidity level is automatically adjusted ~ 2% RH for each degree
difference between the return air temperature and the temperature set point.
When absolute humidity control is used, over dehumidification is avoided in the
space. When overcooling occurs, causing an increase in the relative humidity
reading, the humidity control program “predicts” what the RH will be when the
dehumidification cycle ends and the temperature returns to the programmed set
point. This allows the dehumidification cycle to end at the proper time.
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