setpoint
”
) (
“
Setpoint
”
in the
“
Ventilation
”
menu) (e.g. 0.1 K/h). This ensures the ventilation control
always works directly at the end of the control range. If the compartment temperature sinks
quickly, the ventilation function can react quickly and reduce ventilation.
Information
Of course, this function can result in a higher set point on warm days. But this set point is more realistic
and is thus the ideal set point for the prevailing ambient conditions. Increasing the set point only affects
the ventilation set point; all other nominal values for heating, shutters, minimum-air disconnect and the
additional controllers remain at the
“
normal setpoint
”
.
Example
Let
’
s assume your desired setpoint in the compartment is 20.0
°
C (control range 5.0 K). This setpoint
can surely be reached in the winter because the supply air in this season is generally cooler.
On warm summer days, e.g. 28
°
C, this setpoint cannot be attained as the supply air is signi
fi
cantly
warmer. That means, you warm up the compartment with a supply air temperature that is too high. But
your setpoint is set to 20
°
C! The result: 100 % ventilation takes place. If the supply air temperature
then quickly falls, 100% ventilation is carried out until the compartment temperature eventually falls
below 25
°
C.
That causes a high degree of temperature
fl
uctuations, which can lead to diseases in the animal
population. One remedy could be to manually increase the setpoint or the control range, but these
changes would have to be constantly adapted to the corresponding ambient conditions. And that is
where the automatic reduction function takes over. This function relieves you of the work of having to
constantly modify the setpoint manually.
Information
As the temperature only indirectly gives evidence of the air quality, a suf
fi
cient minimum ventilation
must absolutely be ensured for this function. The automatic reduction makes allowance for this
situation (see Settings
“
Minimum extra
”
in installation menu).
9.3.4
Special function: Humidity control
The humidity in the stall can be controlled by a combined humidity / temperature sensor of the MFTG-
100V type (Art. No. 384046).
On activating the humidity control in the Installation menu a separate control circuit becomes active
which acts on the same output as the control circuit for the temperature-dependent regulation. The
respective higher control (temperature or humidity-dependent) acts on the output for the fan or shutter
(in central exhaust air systems).
If the stall temperature is reduced below the temperature setpoint of the ventilation by the in
fl
uence of
the humidity control, the humidity in
fl
uence is reduced within an adjustable range (
“
Humidity cooling
”
in the Installation menu) linearly to
“
0
”
. (
Installation
–
Humidity Control.
R. H.
50 %
100 %
Min.
Min. 0 %
Max. = 100 %
Min. 35 %
Max. = 85 %
50 %
S
40 %
R
90 %
08.10.2008
v_feuchte_conrol_pte_cte.vsd
AF
AF
Modulation humidity
S
RH setpoint
R
Humidity control range
R. H.
Relative Humidity
Operating Instructions
Fcontrol
–
model series FTET4/6/10AHMQ-L
Settings for operation
L-BAL-E139-GB 2022/03 Index 006
Part.-No.
61/92
