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air quality decreases, then the airflow rate, speed or duct pressure increases to an adjustable maxi-
mum value. This operating mode can only be used for airflow rate, speed or duct pressure control.
The air flow rate, speed or operating stage specified by the economy or comfort mode is always
kept and is increased by the air quality control.
Setpoint
CO2 Eco
CO2 Comfort
Control signal
Supply max
Return max
Supply set
Return set
Table 22: Air quality setpoints
14.5 Night setback
The operating mode Night setback is a special operating mode, which can be selected via the
scheduler, the display or the BMS.
In the night setback mode, the rooms shall be cooled with cool outdoor air to save cooling energy
the next day. The AHU is operated with the separately adjusted airflow rate, speed or duct pressure.
The recovery system, all heating and cooling batteries, humidification and dehumidification are inac-
tive.
Night setback starts according to the operating mode switch (e.g. scheduler at 0:00) when the out-
door temperature is above 12 °C, the room temperature is 3 °C above the setpoint (22 °C) and the
outdoor temperature is at least 5 °C below the room temperature. Night setback will run as long as
the outdoor temperature is above 12 °C, the room temperature is at least 1 °C above the setpoint
(22 °C) and the outdoor temperature is at least 1 °C below room temperature. A minimum operating
period of 30 min guarantees, that it will not immediately be switched off after starting.
Several settings are set during commissioning. The room temperature setpoint and the minimum
operating period, air flow rate, speed or operation stage can be set in the Night setback menu.
If no room sensor and outdoor temperature sensor are present, then the return air temperature and
fresh air temperature are used. For this purpose, these are cyclically tested for 5 min every hour; if
the conditions are met, then the night setback mode continues operating.
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Description
CO
setpoint for economy mode
2
CO
setpoint for comfort mode
2
Requested fresh air amount or airflow rate
Maximum supply airflow rate for poor air
quality
Maximum supply fan speed for poor air
quality
Maximum return airflow rate for poor air
quality
Maximum return fan speed for poor air
quality
Current supply airflow rate / fan speed
request
Current return airflow rate / fan speed
request
Default
1500 ppm
500 ppm
0 %
Nominal value
100%
Nominal value
100%
... m³/h, ... %
... m³/h, ... %
V07-19.0
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