E/0204/39/38
Dehumidification control
The dehumidification control is differently carried out corresponding to the unit equipment (with/
without el. reheat). The following diagrams are valid only with the optional humidity sensor.
The dehumidification is controlled via the room humidity and the room temperature.
Dehumidification
Dehumidification without el. reheat
Here the dehumidification is obtained by reducing the fan speed and simultaneous compressor
operation. Reducing the air flow with constant heat rejection brings air down to the dew point.
Therefore, humidity in the air condenses and deposits on the evaporator surface. When the surface
temperature of the evaporator goes below a factory-set value, the fan speed increases again.
Dehumidification is disabled below a certain value of internal temperature. When the internal
temperature increases again after a certain hysteresis, the dehumidification is enabled again, if the
dehumidification request is still present.
Dehumidification
Dehum.
Set point
(40%)
Dehumidification Start
(10%)
Room humidity
Dehumidifcation
Stop (1%)
Start
value
(20°C)
Stop
value
(15°C)
Set point
cooling
(25°C)
Room temp.
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