5.6.2 Fine dust (PmCtl21y)
By using a PM (particulate matter) sensor as an input from room, this function
controls the fan speeds to keep the set concentration level. Separate setpoints can
be specified for each normal operating mode.
At higher concentrations, the fan speed is increased to supply more fresh air and to
prevent the concentration from exceeding the set value (according to PI-control).
Fan speed is controlled dynamically to a higher value, if necessary up to the
highest supply fan speed value of all defined modes (normal and special).
Minimum speed is defined by the active operating mode.
If the air quality concentration exceeds the set point, the supply pressure is set to a
higher value than the exhaust pressure.
With active air quality control, the speed of both fans is increased and decreased
linearly and simultaneously with a symmetrical control signal (up to the set
operating mode level), which then maintains the target ratio in every situation and
the air quality at the target value.
It is possible that more than one AQ input is used simultaneously from different
rooms. In this case, highest value wins and is used for fan controlling.
Sensor measuring range (concentration or indicators level) can be set for the linear
signal 0…10 V to enable use of various types of sensors. Minimum and maximum
values can be set via ABT Go.
Activation of the PM control requires configuration.
NOTICE
●
Particulate matters control is blocked if the configuration of the room influence
to fan speed is in mode 2, 3 or 4, for example in duct pressure mode
●
In the settings for pressure or airflow, it can be determined whether dampers
are installed in the duct or not. Depending on this, fan speed control can be
disabled for this mode
Available parameters
Current value
BACnet object
R/RW
Note
PM value in room
PmR
AI,107 (X1)
AI,108 (X2)
AI,109 (X3)
AVAL,458 (X22, POS9)
AVAL,471 (A12, QBM)
R
µg/m3
Present ventilation setpoint
particulate matters control
PrSpPmR
AVAL,449
RW
µg/m3
Actual setpoint depending
on operating mode
VntCtl11y parameters (flow)
BACnet object
R/RW
Note
Unoccupied: PM setpoint
SpPmRUcd
AVAL,450
RW
µg/m3
Economy: PM setpoint
SpPmREco
AVAL,451
RW
µg/m3
Comfort: PM setpoint
SpPmRCmf
AVAL,452
RW
µg/m3
Ventilation Kp
GainPmCtr
AVAL,453
RW
%/µg/m3
Ventilation Tn
TnPmCtr
PINTVAL,561
RW
s
Application functionalities
Air quality control (VntCtl11y, 12y, 13y)
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