Assortment / System Description

Fan
-
Powered Box
Air volume flow in the dead zone
19
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19.2 Air volume flow in the dead zone
The fan powered box application configures a minimum supply air flow in the
temperature control dead zone. The function can be configured individually for
all room operating mode.
Description Name Default value
Minimum supply air Comfort
1:Off
2:Minimum ventilation
3:Demand-controlled ventilation
4:Minimum & demand-controlled ventilation
CmfCnf 4:Minimum
ventilation &
demand-
controlled
ventilation
Minimum supply air for Pre-Comfort. PcfCnf 3:Demand-
controlled
ventilation
Minimum supply air Economy EcoCnf 1:Off
Minimum supply air Protection PrtCnf 1:Off
Minimum fan speed for all room operating modes is also configured. The two
air flow specifications must be considered since the fan powered box
application supplies the room in the VAV dead zone and the fan for the room.
Description Name Default value
Minimum fan speed for ventilation FanSpdMinVnt 50 [%]
Supply air VAV minimum air flow for ventilation VavSuAflMinVnt 0 [m
3
/h]
19.3 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 flow from a fan powered box can be individually
configured.
The FBP 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 flow from a fan powered box can be individually
configured. Note however, that a fan powered box of VAV and the fan supplies
the room with air flow. So that both air flow specifications must be considered.
Temperature control
Air quality control