Assortment / System Description

VAV application
Air volume control
18
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18.4 Air volume control
All explanation of volume flow control ignore air aftertreatment. In order words,
the supply air sequences start directly at the room temperature setpoints and
not only after air aftertreatment has reached maximum.
Temperature control works with the actual room temperature setpoints for the
actual operating mode and calculates a set volume flow that moves between
the minimum and maximum setpoints.
The minimum and maximum air volume flows for a VAV actuator can be
configured for each actuator.
The VAV application can be used for air quality control. The room must have an
air quality sensor. The application automatically enables air quality control as
soon as an air quality sensor is configured.
Air quality setpoints can be configured separately for each room operating
mode.
Description Name Default value
Room air quality setpoint for Comfort SpAQualRCmf 900 ppm
Room air quality setpoint for Pre-Comfort SpAQualRPcf 1100 ppm
Room air quality setpoint for Economy SpAQualREco 1500 ppm
Room air quality setpoint for Protection SpAQualRPrt 1500 ppm
The minimum and maximum air volume flows for a VAV actuator can be
configured for each actuator.
Description Name Default value
Supply air VAV maximum air flow for ventilation VavSuAflMaxVnt 100 [m
3
/h]
27.78 [l/s]
Supply air VAV minimum air flow for ventilation VavSuAflMinVnt 0 [m
3
/h]
0.00 [l/s]
Air volume tracking can be configured on the VAV application if supply air VAV
and extract air VFAV is used in a room. You can also define how much positive
or negative pressure can be created in the room.
In the room, parameter AirFlTrn distinguishes between the extract air volume
flow setpoint from the supply air volume flow setpoint.
Description Name Default value
Room air operating mode
1:Neutral
2:Positive pressure
3:Negative pressure
PRMod 1:Neutral
Overflow air volume flow AirFlTrn 10 m
3
/h
2.77 l/s
For example: In a room with negative pressure, the extract air volume setpoint
= 500, for supply air = 600 and AirFlTrn = 100. In a room with positive pressure,
the extract air volume setpoint = 700, for supply air = 600 and AirFlTrn = 100.
Temperature control
Air quality control
Air volume flow
tracking