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been configured). For example: recirculation damper requirement = 50%, i.e. with a base time of 60
minutes, the ventilator operates 30 minutes in fresh air mode and 30 minutes in recirculated air
mode (in this mode, the return fan is at a standstill). In case of an additional air quality control by the
recirculation damper, the air quality has a higher priority.
14.3 Humidity setpoints
Depending on the execution of the AHU can be dehumidified, humidified or dehumidified and hu-
midified; the display differs depending on the execution.
14.3.1
Control mode for humidification and dehumidification
Depending on the execution of the AHU, the operating mode of the control can be chosen between
return air, supply air and room.
14.3.2
Return air control
Normally, the humidification and dehumidification is controlled via the return air humidity. Thus, the
desired room humidity is kept within specified limits; the room humidity should be between 40% and
60%.
14.3.3
Supply air control
In pure supply air devices and if no return air sensor or room humidity sensor is present, then it is
controlled via the supply air humidity; this is then kept within specified limits. Since not the room hu-
midity is measured, the response of the room must be considered when entering the setpoints. De-
pending on the application, higher humidification setpoints in winter and lower dehumidification set-
points in summer may be necessary.
14.3.4
Dehumidification with cooling battery
For dehumidification, the supply air is cooled and again heated up by the heating battery, thus re-
sulting in a dry supply air. In the best case the AHU is equipped with 3 batteries (see also chapter
14.2.2), whereby the dehumidification lowers the saturation temperature, which is an independent
control circuit for temperature control and the postheating battery again raises the supply air tem-
perature.
The water cooling battery, compressor cooling battery or both are used.
V07-19.0
Humidity setpoints
Control mode
Humidification Eco
Humidification Com...
Dehumidificat.Eco
Dehumidificat.Comf...
Max supply
Humidifier
Figure 94: Humidification / dehumidification set-
points
1/7
Return
30%
40%
70%
60%
80%
0.0%
73/115
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