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Controls Training and Service Manual
Infrared Humidification – With Dead Band
Humid Set Point: 50%
Proportional Band: 8%
Dead Band: 2%
45 46 47 48 49 50
Increasin
g
Temperatu
r
e
Humidification On
Humidification Off
Humidity Set Point - (1/2 Dead Band + 1/2 Proportional Band)
DB
Note: in the above example that the control band begins at the 50% humidity set
point and has a length of 5%, which is ½ of the programmed dead band value plus
½ of the programmed humidity proportional band value.
As the return air humidity decreases the infrared humidifier is activated at 45%RH
or ½ of the dead band value plus 100% of the humidification control band. When
the return air humidity starts to increase, the infrared humidifier is deactivated at
47%RH or ½ of the dead band value plus 50% of the humidification control band.
Autoflush Control for Infrared Large (IFL) or Small (IFS)
Pans
The Autoflush Water-Level Control software program is an integral part of the
infrared humidifier system. The program automatically controls a water makeup
valve to maintain the proper water level in the humidifier pan during operation.
When a call for humidification exists, the program performs a series of checks.
The first check to see how long the infrared humidifier has been off. If the off time
is equal to or greater than the programmed value (factory default is 15 hours), it is
assumed that the pan is dry and a program called pre-fill is initiated to add water to
the pan. During the pre-fill operation the infrared lamps are inactive. The pre-fill
time is programmable with an adjustable range of 1 to 120 seconds for either pan
size. The factory default for a large (IFL) pan is 60 seconds and for a small (IFS)
pan is 30 seconds.
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