5.13 Filter supervision (FilAMon21y)
Supply and extract duct air filters are getting dirty when the unit is in operation and
they need to be changed in relatively regular service intervals.
Service indication with timer
Maintenance interval timer is set on the controller. When the operating hours reach
the runtime limit, the contamination level is assumed to be high enough and it’s
time to schedule a filter change.
Service indication with pressure differential switch input
Optionally, filters are equipped with dP switches which send a signal to controller
when the set contamination level is reached and it’s time to schedule a filter
change.
Service indication with differential pressure sensors
Pressure sensors QBM97 can be used instead of dP switches. A sensor and a
switching point can be defined for each filter to indicate the level of filter
contamination. A fixed delay time of 5 minutes is used to avoid alarming caused by
short-term pressure changes.
When the filter timer is elapsed or the pressure differential input requires a filter
change, a B-Alarm is activated.
Before switching off the unit for filter replacement, it is recommended to execute a
shut down for maintenance, see Start-up / shut-down sequence [➙ 130].
Available parameters
Actual values
BACnet object
R/RW
Note
Differential pressure, filter clogged
FilAirDiffPMon
BI,72 (D1)
BI,89 (D2)
BI,106 (X3)
BI,123 (X8)
R
Differential pressure filter supply
DiffPFilASu
QBM#1: AVAL,667
QBM#2: AVAL,669
R
Pa
Differential pressure filter exhaust
DiffPFilAEh
QBM#1: AVAL,668
QBM#2: AVAL,670
R
Pa
Actual runtime filter since last maintenance
TiOpFil
AVAL,158
R
hrs
Basic settings
BACnet object
R/RW
Note
Runtime limit for air filter replacement
TiOpFilRpc
AVAL,157
RW
H
Filter time reset
FilTiOpFil
MVAL,350
RW
1: Ready
2: Reset
Max differential pressure for supply air filter
DiffPFilASuSp
AVAL,671
RW
Pa
Max differential pressure for exhaust air filter
DiffPFilAEhSp
AVAL,672
RW
Pa
Application functionalities
Filter supervision (FilAMon21y)
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