Available parameters for
air flow control
Unit configuration
BACnet object
R/RW
Unit
Air flow nominal
AirFlNom
AVAL,187
RW
m
3
/h
Maximum air flow of the unit
Air flow minimum
AirFlMin
AVAL,186
RW
m
3
/h
Minimum air flow of the unit
Minimum fan speed
FanSpdMinRel
AVAL,192
RW
%
Fan speed feedback fault Limit
FanSpdFbFltLm
AVAL,190
RW
% if no feedback signal
available, see alarming
Allowed tolerance time fan speed
feedback fault supply fan =
startup delay time step 7
TiSttUpSpdVnt
PINTVAl,104
RW
Tolerance time =
TiSttUpSpdVnt – 5 sec,
maximal 60 sec
Allowed tolerance time fan speed
feedback fault exhaust fan =
startup delay time step 6
DlyOnAflEhSta
PINTVAL,129
RW
Tolerance time =
DlyOnAflEhSta – 5 sec,
max 60 sec
Ramp up / down time fans
TiRmpFanSuSpd
PINTVAL,93
RW
s
5.5.2.1 Available parameters for the supply fan (constant air flow)
Available parameters
supply fan
Current state
BACnet object
R/RW
Unit
Present flow setpoint supply
SpAirFlSu
AVAL,182
R
m
3
/h
Present flow supply
AirFlSu
AVAL,183
R
m
3
/h
Supply fan pressure diff.
DiffPFanSu
AVAL,17 (POS9)
AVAL,459 (QBM)
R
Pa
Supply fan speed
Prio 2: Fire / Smoke
Prio 5: Protection
FanSuSpd
A1: AO,102
A2: AO,111
A3: AO,120
A4: AO,129
Modbus: AO,149
RW
%
Supply fan speed feedback
FanSuSpdFb
Tacho:AI,65
0~10V:AI,96
Modbus: AI,163
R
%
Supply fan fault
FanSuFlt
Modbus: BI,144
R
Operating mode settings
BACnet object
R/RW
Unit
Unoccupied: supply
SpAirFlSuUcd
AVAL,272
RW
m
3
/h
Economy: supply
SpAirFlSuEco
AVAL,271
RW
m
3
/h
Comfort: supply
SpAirFlSuCmf
AVAL,270
RW
m
3
/h
Fire place: supply
SpAirFlSuFplc
AVAL,57
RW
m
3
/h
Application functionalities
Fan speed control
5
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