Installation And Commissioning - S+S Regeltechnik AERASGARD AC02-Modbus Operating Instructions, Mounting & Installation

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Installation and Commissioning

ATTENTION !
The minimum CO2 concentration of outdoor air amounts to approx. 350 ppm in leafy, hardly industrialised areas. Gas inter-exchange in the sensor element
happens by diffusion. Depending on the changes to the concentration and the flow velocity of the air surrounding the sensor, the reaction of the device to
the change of concentration may take place with a delay. It is essential to choose an installation location for the duct sensor in which that the air stream
"presses" into the duct tube. It is essential to choose an installation location for the on-wall sensor in which the air stream flows around the sensor.
Otherwise the gas exchange may be considerably delayed or prevented.
Commissioning
After the device is switched on, a self-test and temperature equalisation are performed. Depending on the ambient conditions, this process takes 30-50 minutes
(as an option, manual calibration can now be performed). If commissioning with automatic calibration, proceed as follows:
1. Open all windows or set the air conditioning system to use outdoor air
2. Switch on the device and move away from the device. If possible, all persons should leave the room.
3. The device is ready to use after 50 minutes.
Automatic calibration of the CO2 measurement
The regular exchange of fresh air is all that is required for the self-calibration technology in the sensor (CO2 concentrations: 350-500 ppm). The device
detects this condition and performs the calibration automatically. It is sufficient to open the windows or set the air conditioning system to use outdoor air
at regular intervals and to stop all CO2-producing processes that influence the ambient air. Proceed as follows:
Open all windows fully or set the air conditioning system to use outdoor air 1x weekly for 15-20 minutes.
If possible, all persons should leave the room during this time.
Regular ventilation of the rooms and flushing of the duct with fresh air will increase the measuring accuracy of the sensor.
Automatic zero point calibration is deactivated by default in the as-delivered condition and, if required, must be activated using the Modbus.
Manual calibration of CO2 measurement
Manual calibration can be carried out independently of automatic calibration. Sufficient fresh air must be provided
before and during the calibration procedure (CO2 concentration: 350-500 ppm). Also make sure that no CO2-
producing processes influence the ambient air. Proceed as follows to perform manual calibration:
1. Preparation: Remove the housing cover and open all windows or set the air conditioning system to use
outdoor air.
2. Press and hold the "ZERO CO2" button until the flashing LED row changes to a steady light after 5 seconds.
Devices with a display indicate "AUTO 0" and change the countdown from 5 to 600.
The calibration process has started. Keep the windows open or the air conditioning system set to use
outdoor air.
3. If possible, all persons should now leave the room.
4. After 10 minutes, the calibration is complete (status LED has gone out, the countdown is complete) and the
device should indicate or transmit a CO2 concentration of between 350-500 ppm.
Automatic calibration of the VOC measurement (permanently active)
The regular exchange of fresh air is all that is required for the self-calibration technology in the sensor. The device detects this condition and
performs the calibration automatically. It is sufficient to open the windows or set the air conditioning system to use outdoor air at regular intervals. Make
sure that no harmful substances influence the ambient air during this process. Proceed as follows:
Open all windows fully or set the air conditioning system to use outdoor air 1x weekly for 15-20 minutes.
During this time, the release of gases from volatile organic substances must be prevented as far as possible.
Regular ventilation of the rooms and flushing of the duct with fresh air will increase the measuring accuracy of the sensor.
Every time the device is switched on, the automatic calibration cycle restarts and calculates a correction value across the operating period.
In case of power disruptions of less than 7 days, the calculation algorithm may be supported with a manual calibration to adjust the correction value more
quickly.
Manual calibration of the VOC measurement
Manual calibration can be carried out independently of automatic calibration. Sufficient fresh air must be provided
before and during the calibration procedure. Also make sure that no harmful substances influence the ambient air.
Proceed as follows to perform manual calibration:
1. Preparation: Prevent the release of gases from volatile organic substances as far as possible, open
windows and set air conditioning system to use outdoor air, remove the housing cover and wait 15 minutes.
2. Press and hold the "ZERO VOC" button until the flashing LED row changes to a steady light after 5 seconds.
Devices with a display indicate "AUTO 0" and change the countdown from 5 to 60. The calibration process
has started. Keep the windows open or the air conditioning system set to use outdoor air.
3. After 60 seconds, the calibration is complete (status LED has gone out, the countdown is complete) and the
device indicates or transmits the current VOC concentration.
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