iCOM
Controls Training and Service Manual
Humidity Control
Humidification and/or Dehumidification in Percent (%)
The humidity control program for the
iCOM
microprocessor is based on a
calculated percent (%RH) requirement for humidification and/or dehumidification.
This percent (%RH) requirement is determined by the control type (algorithm)
selected by the user.
There three (3) user selectable humidity control programs are:
•
Absolute Humidity, grains of moisture in the air
•
Relative Humidity (%RH)
•
Compensated
Humidity Control Program Types
Absolute (predictive) Humidity Control – Factory Default Setting
Absolute (predictive) humidity control is based on the moisture content in the
return air. The
iCOM
microprocessor control automatically adjusts the humidity
control as the return air temperature deviates from the programmed temperature
setpoint. This calculation converts the return temperature and humidity values to a
moisture content value defined as either grains per cubic foot or grains per pound.
This recalculated content value is compared to the content control band that is
determined by the:
•
Programmed
temperature setpoint
•
Programmed humidity setpoint in %RH
•
Programmed
humidity
proportional band in %RH
This automatic adjustment results in a predictive humidity control response. With
absolute humidity control, the humidity control program is automatically adjusted
by approximately 2% RH for each degree difference between the return air
temperature and the temperature set point. See the following example on the
next page.
Temperature
Set Point
Humidity
Set Point
Humidity
Proportional Band = 6%
Content Level
Grains per LB
70
°
F
50% +3%
59.2
70
°
F
50% -3%
52.5
24
Содержание Liebert iCOM
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