GB.COMPACTAHSK.210520
Registered design. The company reserves the right to make design changes without prior notice.
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INSTALLATION
FUNCTIONS
*FUNCTIONS*
TEMPERATURE
AIR FLOW/PRESSURE
FILTER
OPERATION
HEATING
COOLING
IN/OUTPUTS
IQnomic Plus
ALL YEAR COMFORT
9.3.1.4 Clean Air Control
The Clean Air Control function is used in ventilation sys-
tems where the aim is to control the airflow according to
the content of emissions/impurities in the room air.
A VOC sensor (Volatile Organic Compounds) is installed
inside the air handling unit as standard. This sensor meas-
ures the content of emissions/impurities in % VOC.
When CO
2
is emitted from an occupant, this creates a
proportional amount of, for the VOC sensor, measurable
emissions/impurities. For an approximate translation of %
VOC to CO
2
-content, see the diagram.
When the air handling unit is powered up for the first time
the VOC is initialised, it then provides a fixed signal of
approximately 50% VOC for 6 hours (applies to VOC sen-
sors with part no. 328964-01, VOC sensors with part no.
328964-02 and 804919-01 are initialised at the factory).
If the unit at a later time is de-energised, and is subse-
quently reenergised, the sensor is reinitialised for 15 min-
utes (provided that initialisation during the first energising
occasion was not interrupted).
When the VOC sensor measures contents of emissions/
impurities that are lower than the preset value; the air
handling unit’s supply air and extract air flows are then
equivalent to the preset min. flows. When the VOC sensor
instead measures contents of emissions/impurities that are
higher than the preset value, the supply air and extract air
flows are variably increased until the preset value or max.
flow is reached.
When the Clean Air Control function is activated, the fan
regulation modes are automatically selected (extract air
fan demand controlled, supply air fan slave controlled).
Later on, they can only be read under Functions in the
menu.
Settings:
Value
Setting Factory
range
setting
Clean Air Control
Inactive/Active
Active
VOC sensor
Analogue/Bus***
Bus
VOC low speed
10 - 90 %
50 %
VOC high speed
10 - 90 %
30 %
Min. flow
* m3/s
0.08 m3/s
Max. flow
* m3/s
0.2/0.3 m3/s**
* )The setting range is the same as the min./max. setting of the
air handling unit.
** Size 02 = 0.2 m3/s, Size 03 = 0.3 m3/s
*** Analogue = part number 328964-01/02.
Bus = part number 804919-01.
1000
1500
2000
400
10
20
30
40
50
60
70
80
90
% VOC
CO
2
c
o
nt
ent
, p
p
m
Example:
800 ppm corresponds to approx. 30% VOC.
If influenced by other emissions/impurities in the air such
as cooking smells, cigarette smoke, etc. the VOC content
increases in relation to the CO
2
content.
* AIRFLOW/PRESSURE *
SA FAN REGULATION
EA FAN REGULATION
CLEAN AIR CONTROL
OUTDOOR TEMP COMP.
SA DOWN REGULATION
