-
The unit is equipped by default with the AQS sensor to read the CO
2
concentration in the space, possibly
also with the RH humidity sensor or even the Radon sensor as part of electrical accessories.
-
If you want to control the unit using AQS sensors, activate the automatic mode function – button 4.
-
The unit responds by continually controlling the need for real-time ventilation triggered by sensors:
o
When the concentration of the monitored substances is reached, ventilation shall be switched
on with the minimum flow rate:
CO
2
– 800 ppm,
RH – 50%.
o
If the reduction of the concentration of the monitored substances in the room is not achieved,
the unit controller increases the flow up to the maximum flow value set by the user.
o
The unit controller will start to decrease the flow rate continuously again while reducing the
concentration.
o
The aim of the regulation – ventilation, is to find the ideal degree of ventilation (flow rate)
depending on the concentration of the monitored substance in the ventilation room. For this
reason, the unit may ventilate for a long time until it reaches safe limits of concentration or
complete ventilation of the substance being monitored.
o
When the concentration is reduced to a specified value, ventilation is switched off and the unit
is switched to the standby mode:
CO2 – 700 ppm,
RH – 45%.
o
If there is a requirement for ventilation from several sensors, the controller gives priority to a
sensor with a higher ventilation requirement.
Fig. 36
5.4.8. Hidden RegulationFunctions
-
The control behaviour includes automatic processes that ensure optimal operation of the unit with
emphasis on the maximum service life and efficiency of the operation. These processes are part of the
manufacturer's factory setup and know-how. The user cannot change them. As a result of these
automatic processes, the behaviour of the unit may be different from that assumed by the user.
-
These are mainly automatic processes:
o
unit preheating control – switches only when necessary,
o
anti-freeze logics triggering – measures against recuperator freezing,
o
minimum preheating, heating operation time – protective function,
o
cooling after switching off, heating – protective function against overheating of the exchanger,
o
unit control using AQS sensors – automatic functionality according to ventilation needs,
5.4.9. Automatic Unit Control using AQS Sensors
42
Version 1 – GBR(23/06/2021)
D-502-0152
