Air recirculation function

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In the recirculated air mode, in the event of a high pollutant load, e.g. in a traffic jam, the supply of fresh air can be blocked. When the air recirculation function is active, oxygen levels are run-down in the passenger compartment. After a while this can increase the relative humidity in the passenger compartment and cause misting. To ensure a sufficient fresh air supply, the air recirculation function is limited to a certain duration (e.g. 15 minutes air recirculation function -> 30 seconds partial fresh-air mode -> 15 minutes air recirculation function -> etc.).

Depending on the series and version, the ambient temperature is also considered for the air recirculation function.

Example:

at ambient temperatures below 0 C:
2 minutes air recirculation function -> 1 minute fresh air mode -> 2 minutes air recirculation function -> etc.
at ambient temperatures of 0 C to 6 C:
3 minutes air recirculation function -> -1 minute fresh air mode -> 3 minutes air recirculation function - > etc.
during operation without air conditioning function at ambient temperatures above 6 C:
4 minutes air recirculation function -> -1 minute fresh air mode -> 4 minutes air recirculation function - > etc.
during operation with air conditioning function at ambient temperatures above 6 C:
12 minutes air recirculation function -> -1 minute fresh air mode -> 12 minutes air recirculation function -> etc.

The air recirculation function is activated when the air recirculation button on the control panel is pressed. This closes the fresh air/recirculated air flap. The refrigerant circuit does not have to be activated.