Recirculated Air Mode, IHS and IHKS

Recirculated Air Mode, IHS And IHKS

Recirculated air mode, IHS and IHKS
This functional description covers the recirculated air mode of the integrated heater control IHS and the integrated heating / air conditioner control IHKS.

Brief description of components

Recirculated-air button







When the recirculated-air button is pressed, the fresh air recirculated-air flap is closed. When pressed again, the fresh air recirculated-air flap is opened again. The status is indicated by a function LED in the recirculated-air button.

System functions

Recirculated-air mode
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. With recirculated air mode, the oxygen in the vehicle interior is used up. Furthermore, in the recirculated air mode the relative humidity in the vehicle interior can increase, which can lead to fogging over.
To ensure adequate fresh-air supply, the recirculated air mode has a time limit (30 min recirculated air mode -> 30 s partial fresh-air mode -> 30 min recirculated air mode -> etc.).
The recirculated air mode is activated when the recirculated-air button on the operating unit is pressed.
The fresh air recirculated-air flap is closed. The refrigerant circuit is not force-activated. The recirculated air mode is saved before the idle state of the control unit is reached, i.e. the function is activated after a reset.

Additional components
- Microfilter
A microfilter with activated carbon is built into the IHS / IHKS. The activated carbon filter makes an additional contribution to cleaning the fresh air that enters of gaseous pollutant emissions. The state of the microfilter is not picked up.

Notes for Service department

Observe the following information for service:

Coding and programming
- Coding
When coding the vehicle-specific data, the following details (among others) are taken into account:
- Engine variant (diesel engine or petrol engine)
- Version of the control unit (IHS / IHKS)

- Programming
Flash programming of control unit via the K-CAN is possible.

Country-specific versions
The temperature display can be switched to °C or °F using the on-board computer function.
No liability can be accepted for printing or other errors. Subject to changes of a technical nature.