Data Sheet for Application

Application sheet VVS274
2 | 7 A6V12189448_en--_a
Function diagrams / sequence diagrams
Exhaust air volume flow setpoint
V
EhAirFlMax
FhAflMinEffEh
EhAirFlMin
Sash pos
Air flow Sp
SshpSpAflMin
SshpSpAflMin
FhSpAirFlEh
Volume flow (Setpoint)
Exhaust air VAV maximum air volume flow
Fume hood exhaust effective minimum air volume flow
Exhaust air VAV minimum air volume flow
Front shutter position
Face velocity setpoint
Sash position for minimum exhaust air volume setpoint
Sash position for maximum exhaust air volume setpoint
Exhaust air volume flow setpoint
Function description
Basic functions
● PID control for fume hood exhaust air VAV
● Fume hood VAV exhaust flow rate dynamically set
as per face velocity, fixed flow rates selected off-
line or as per occupancy, flow rates selected
automatically as per sensors connected to sashes,
flow rates selected manually.
● Supports different types of VAV damper actuators.
● Supports dedicated sensors for detecting face
velocity, sash position, fume hood extract air
volume flow.
● Supports one fan for the stabilizing jet, including
monitoring.
● Regular automatic pressure sensor calibration
(DXA.S04P…)
● Supports dedicated KNX PL-Link operator display
panel (ODP).
● Pushbuttons, switches for integrated lighting
● Different air flow operating modes including
emergency functions (e.g. purge)
● The application function communicates with room
control using the room/segment model.
Options
● Extract air VAV sensor 0...10 V
● Optional system alarms displayed on the
management station notify building operators of
possible faults
● Optional trends can be enabled
● Fume hood sash switch for fume hood setpoint (2-
position volume air flow control )
● Optional stabilizing jet output on triac for an
external relay via configurable control functions
Auxiliary functions
● Green Leaf function (energy saving indication)
● Multisegment use of DXR2 automation stations
with pressurized room application
● Control via central commands (e.g. scheduler
program for fume hood)
● Central override functions for VAV dampers
● Configurable, generic universal control functions
for free I/Os
Variants
● KNX PL-Link sensor or binary sensor detects
presence