Stulz C7000 - Page 97

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C7000 INSTRUCTIONS fOR A/C UNITS
Dewpoint control
The dewpoint control as the control according to specific humidity are espe-
cially suited for the supply air control.
A feedback of dehumidification and cooling (described under dehumidification
according to relative humidity) is avoided here.
The actual dewpoint is calculated out of the actual temperature and humidity
values.
- Dehumidification
The dewpoint control calculates the start dewpoint out of the set temperature
and the start humidity (for dehumidification) and the stop dewpoint out of the
set temperature, the start humidity and the hysteresis.
If the actual dewpoint is bigger than the start dewpoint, dehumidification is
switched on. If the actual dewpoint is smaller than the stop dewpoint, dehu-
midification is switched off.
For a dehumidification of the air with water as cooling medium, the water tem-
perature must be smaller than the dewpoint of the actual values minus 1,0 K
and bigger than the lower limit value for the water temperature.
If a dewpoint can not be calculated because a value which is necessary for the
calculation (start humidity, actual temperature, actual humidity etc.) is lacking,
the water temperature must be in the range within the min/max limit values to
enable dehumidification.
The start and stop dewpoints for dehumidification are displayed in the Info
menu.
In another Info menu the dewpoints of the actual values and setpoints are
displayed.
These values are also displayed if the dewpoint control is deactivated.
- Humidification
The dewpoint control calculates the start dewpoint out of the set temperature
and the start humidity (for humidification) and the stop dewpoint out of the set
temperature, the start humidity and the hysteresis.
If the actual dewpoint is smaller than the start dewpoint, humidification is
switched on. If the actual dewpoint is bigger than the stop dewpoint, humidifi-
cation is switched off.
Dewpoint control
Dehumidification
ON
OFF
Stop DP
DP/°C
Start DP
DP: dew point
Info/Components/Dehumidific.
Info/Values/Humidity/more
Dewpoint control
Humidification
ON
OFF
Stop DP
DP/°C
Start DP