Operation
Operating Instructions 2CKA001473B8822
│23
For a set fan control:
– The entered CO
2
limit value has been
exceeded.
– The fan switches on
automatically.
Fig. 20:
Fan control: CO
2
threshold value exceeded
– The entered limit value for the
relative humidity (RH) has been
exceeded.
– The fan switches on
automatically.
Fig. 21:
Fan control: RH threshold value exceeded
Exceeding of the threshold value:
■
If the set threshold value is exceeded, the control switches the fan to level 1.
■
If the measured value rises by a further 10%, the control switches the fan to level 2.
Dropping below the threshold value:
■
If the measured value drops below the threshold value by 10 ppm or 1% for the relative
humidity (RH), the control switches the fan off again after the set switch-off delay.
■
Level 2 is switched off immediately when dropping below the threshold value.
NOTE
■
If the 2nd level switched on, the contact of the 1st level is switched off.
■
The CO
2
value has priority in the display.
– If the CO
2
value is the first to drop below the threshold value, the display
changes to the RH value in the centre.
– The relay remains active until both values are again below the threshold
value.
