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12
CONTROL
Depending on the configuration the fan may be equipped with an electronic temperature and speed
control unit, Fig. 6.
KSB fan is a perfect solution for ventilation of premises requiring permanent temperature control (i.e.
greenhouses). The fan is equipped with an electronic temperature and speed control unit and automatically
changes the impeller speed (air flow rate) with respect to the temperature in the ventilation duct or in the
premise.
min
max
t C
25
24
26
23
27
22
28
21
29
20° C
30° C
Operation of KSB fans equipped with an electronic temperature and speed control unit.
Set the desired air temperature (thermostat set point) by turning the thermostat control knob and the
minimum rotation speed (air flow rate) by turning the speed control knob. If the air temperature increases
above the thermostat set point the fan switches to the high speed (maximum air flow rate). If the temperature
decreases below the thermostat set point the fan switches to the pre-set lower speed.
To
avoid
in the duct is equal to the set temperature point, the speed switch delay is activated. There are two switch delay
patterns for various cases:
The temperature sensor-based feedback delay (KSB U option):
The motor switches to high speed as the air temperature exceeds 2 °C above the set thermostat set point.
The motor revers to the pre-set lower speed as the air temperature drops below the thermostat set point. This
pattern is used to keep air temperature to within 2 °C. In this case the motor speed switches are rare.
2. Timer-based feedback delay (KSB...U1 option).
As the air temperature exceeds the set thermostat set point, the motor switches to higher speed and the
switch delay timer is activated for 5 min. The motor reverts to lower speed as the air temperature drops down
below the thermostat set point and only after 5 minutes countdown.
This pattern is used for exact air temperature control. The speed switches for the fan with U1 option
are more frequent as compared to the operating logic of the fan with U option, however the minimum
operating cycle at one speed is 5 minutes.
V51EN-04.indd 12
Speed control knob
Thermostat operating
light indicator
Thermostat control knob
frequent
motor
speed
The front panel of the electronic module has the
following controls and indicators:
Speed control knob for low speed setting.
Temperature control knob for temperature
setting.
Thermostat operating indicator.
The fan is available in two modifications:
with a temperature sensor built into the fan
duct (U/U1 option);
with a remote temperature sensor attached
to a 4 m long cable («Un»/U1n» option).
Fig. 6
switches
when
KSB
the
air
temperature
23.10.2015 9:57:27
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