CLK 320 (209.365) V6-3.2L (112.955) (2004)
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in the AC housing and thus conducts the air through the activated charcoal filter.
As a result, the pollutant content in the fresh air is reduced and the odor emission decreased. With an increased CO and NOx content in the outside air,
recirculated air mode is selected automatically with the aid of the C-AAC [K-KLA] multifunction sensor
Recirculated air mode which is regulated as a function of pollutants is not possible in the AC OFF-mode and with outside temperatures less than 5 °C.
Display (4)
The display (4) is designed to inform the driver of the settings of the ventilation system and air conditioning. The information is provided in form of the
words, symbols and digits.
Depending on the setting generated by means of the multifunction steering wheel, the temperature appears in the display (4) either in °C or in °F. Other
messages are presented by means of the corresponding symbols.
The display employs a negative technology design, in other words light digits against a dark background.
Recirculated air switch (N22/7s2)
A short press (< 1.5 s) of the recirculated air switch (N22/7s2) actuates the fresh and recirculated air flap actuator motor, which in turn actuates the fresh
and recirculated air flap and thus closes the fresh air opening and opens the recirculation duct in order to enable the air to be supplied from the passenger
compartment. The LED in the recirculated air switch (N22/7s2) lights up in recirculated air mode.
Recirculation air convenience closing function
If the recirculated air switch (N22/7s2) is pressed for longer than 1.5 seconds, all the open windows and the tilting/sliding roof are closed automatically
(windows and tilting/sliding roof must be normalized) in addition to activating the recirculated air function. The LED illuminates during the recirculated
air mode. Tilting/sliding roof and power windows are operated one after the other in order to avoid current peaks.
If the button is pressed once again (> 1.5 s), the windows and the tilting/sliding roof are moved back into the previously stored position and the
fresh/recirculated air flap moves into the fresh air position (LED off).
The convenience closing function can only be started if the LED in the recirculated air switch (N22/7s2) or the LED in the activated charcoal filter
button (3) are not illuminated.
Any window which has been opened manually during this recirculation air phase, remains in this position when the recirculation air function is canceled,
all other windows move into the stored position. The positions of the tilting/sliding roof and of the side windows which existed prior to the
commencement of the closing operation, are stored by the overhead control panel control unit, the left and right door control unit. The windows and the
tilting/sliding roof, which were closed by means of the convenience closing function, remain closed if the recirculated air switch (N22/7s2) is pressed
only briefly (< 1.5 s). In this case only the fresh air/recirculated air flap is moved into the fresh air position. The stored positions are canceled when the
ignition is switched off.
Defroster button (8)
Pressing the defroster button (8) initiates the defrost function.
The defrost function works according to the following logic:
^
The heating power is controlled by the outside temperature.
^
The entire air flow is directed onto the windshield and front side windows, defroster nozzles open.
^
The air blown in is dehumidified depending on the humidity.
^
The blending air flap actuator motors at left and right regulated.
^
Footwell nozzles closed.
^
Blower capacity 80 %, manually adjustable.
Blower button (10)
The blower button (10) switches the control voltage for the blower regulator in 7 stages (indicated in the display (4) by 7 wedge display segments),
depending on the position via the comfort AAC control and operating unit (N22/7). This facilitates control of the blower speed from 0 to 100 %.
AC OFF button (11)
When the AC OFF button (11) on the comfort AAC control and operating unit (N22/7) is pressed, the LED comes on, the refrigerant compressor is shut
off and thus the cooling mode is switched off. The air is no longer cooled and dried.
In vehicles with diesel engines the heater booster control unit is also shut off.
All other functions are retained.
The pollutant-controlled recirculated air function is not available in AC OFF mode.
In order to shut off the refrigerant compressor, the comfort AAC (C-AAC [K-KLA]) control and operating unit (N22/7) transmits the shut-off request
and the specified value = 0% to the front SAM control unit with fuse and relay module via CAN-B. At the same time, the refrigerant compressor torque
is set to "0" and transferred to the engine electronics and the electronic transmission control via the EIS control unit. The front SAM control unit with
fuse and relay module sends the canceled load increase signal to the engine electronics via the EIS control unit and switches the refrigerant compressor
off after a defined time delay.
