| Function of dust and pollen filter with activated charcoal filter insert |
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| A dust and pollen filter with additional activated charcoal filter element is installed together with the air quality sensor -G238-. |
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| The filter with activated charcoal inlay adopts the roll of the dust and pollen filter. It can also filter harmful gasses such as ozone, benzene, nitrogen dioxide etc. out of the air flow |
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| The task of the activated charcoal is to absorb impurities from the air flow until the fresh air flap is closed and the air conditioning system is operating in air recirculation mode. If the „automatic air recirculation“ function is selected, the Climatronic control unit -J255- switches from fresh air to air recirculation mode as soon as the air quality sensor detects gaseous impurities in the ambient air. |
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| The activated charcoal layer in the dust and pollen filter reacts with noxious substances in the air in different ways: |
| Certain noxious substances are stored permanently in the activated charcoal layer. |
| Others are converted into harmless compounds in a manner similar to that of a catalytic converter. |
| For the remaining substances, the activated charcoal functions like a condenser. As noxious substances increase, initially they are stored until a certain level of saturation is achieved. As the portion of noxious substances in the air decreases, the activated charcoal layer gradually releases the particles. |
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| Because the activated charcoal layer permanently stores part of the noxious substances, renewing the dust and pollen filter before the prescribed renewal period would be advantageous, if: |
| the vehicle is driven in areas with heavy air pollution, |
| the vehicle is driven mainly with the „automatic recirculation mode“ switched off, |
| the vehicle is not equipped with an air quality sensor and consequently has no „automatic recirculation mode“. |
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| On vehicles with air quality sensor, the air conditioning system should generally be operated with the „automatic recirculation mode“ activated. However, if it is necessary or desired to switch the function off, the following should be observed: |
| The activated charcoal layer in the dust and pollen filter will become saturated after a certain period of time. |
| A saturated filter is not capable of absorbing any more noxious substances, and these will flow unrestricted into the vehicle. |
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| The main task of the dust and pollen filter and the air quality sensor is to prevent peak levels of pollution from entering the passenger compartment of the vehicle. To this end, the following should be observed: |
| If the vehicle is being driven in an area with relatively clean air (with low levels of noxious substances), switching from fresh air to air recirculation mode is actuated at a different point in time than in an area with a high level of pollution (e.g. industrial area). |
| The switch from fresh air to air recirculation occurs independently of the base level of pollution whenever the pollution level increases (e.g. when driving through a cloud of exhaust soot). |
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| The filter with activated charcoal can be installed in all vehicle types (also vehicles without air quality sensor). The same restrictions as those for operation of an air conditioning system with deactivated „automatic recirculation mode“ apply to these vehicles. |
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