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14.4.1
Sensor type, control procedures
One type of sensor and one control procedure come into use, depending on the execution of the
AHU.
CO2 sensor
This sensor measures the CO
worse the air quality. As a guide for the setting of the CO
used.
Air quality
Outdoor air (good quality)
Room with good air quality
Room with medium air quality
Room with moderate air quality
Room with low air quality
Table 20: Room air quality
Recirculation damper
For the control of the air quality by means of a recirculation damper, it is possible to determine
whether the air quality has priority (default setting: Yes). Depending on the requirements, the fresh
air mode is active for a prolonged period (see chapter 14.2.6 for the method of operation).
Setpoint
Min fresh air
Max fresh air
Table 21: Fresh air for air quality control
Fan speed
In case of good air quality, the AHU is operated with the airflow rate, speed or duct pressure speci-
fied by the operating modes economy and comfort; this setting should be as low as possible. If the
V07-19.0
Air quality setpoints
CO2 Eco
CO2 Comfort
Control signal
-----------------------------
Supply max
Return max
Figure 95: Air quality
concentration [ppm] in the return air; the higher the concentration, the
2
Description
Minimum opening position for the fresh air
damper
Maximum opening position for the fresh air
damper
1/5
1200 ppm
800 ppm
0.00%
5000m3/h
5000m3/h
concentration, the following table can be
2
CO
concentration
2
~ 400 ppm
< 800 ppm
800 ... 1000 ppm
1000 ... 1400 ppm
> 1400 ppm
Default
20%
100%
75/115
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