All explanation of volume flow control ignores 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

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.

Air quality control

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

Setpoint room air quality for comfort

SpAQualRCmf

900 ppm

Setpoint room air quality for pre-comfort

SpAQualRPcf

1100 ppm

Setpoint room air quality for economy

SpAQualREco

1500 ppm

Setpoint room air quality 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 [m3/h]
27.78 [l/s]

Supply air VAV minimum air volume flow for ventilation

VavSuAflMinVnt

0 [m3/h]
0.00 [l/s]

Air flow
tracking

Air volume tracking can be configured on the VAV application if supply air VAV and extract air VAV 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 pressurization mode

1:Neutral
2:Positive pressure
3:Negative pressure

PRMod

1:Neutral

Transferred air volume flow

AirFlTrn

10 m3/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.