Variable air volume control over AA
OFF
25 %
0.0
Fb39 = ON (for variable air volume control)
MIN AA (minimum air volume) / 0 to 100 %
K
P
(Factor of change) / 0.0 to 10.0*
Fan operation dependent on room
temperature or room humidity
OFF
5 °C
5 %rH
Fb42 = ON
MIN: Reaction when limit is not reached
MAX: Reaction when limit is exceeded
Difference room temperature set point/ 1 to 10 °C
Difference room humidity set point/ 1 to 10 %rH
* Factor of change with cascade control only
6.9
Air quality control via the mixed air chamber
The air quality control via the mixed air chamber function is available in the systems with
code numbers Anl 2, Anl 4 and Anl 8. The control signal Y2 is formed from two control sig-
nals that exist internally and originate from the temperature control loop and the air quality
control loop. If the measured air quality falls below the value
Air quality set point, the out-
door air rate determined until then just by the temperature control loop is increased depend-
ent on the control parameters
K
P
Air quality control and T
N
Air quality control. Under opti-
mal conditions, i.e. the
Air quality set point is exceeded, the outdoor air rate can be gradu-
ally reduced by the PI control algorithm until it reaches
Minimum outdoor air rate, provided
the temperature control loop does not demand the opposite.
Functions
WE
Configuration
Assignment of inputs AE1 to AE4,
0 to 10 V
OFF
FB18 = ON,
option:
AE4L
Parameters
WE
Range of values
Air quality set point
50
1 to 100
K
P
Air quality control
0.5
0.1 to 99.9
T
N
Air quality control
60 sec
1 to 999 sec
Minimum outdoor air rate
20 %
0 to 100 %
58
EB 5477 EN
Control functions