CLK 550 (209.372) V8-5.5L (273.967) (2008)
Control Assembly: Description and Operation
GF83.40-P-2180-01QB Automatic Air Conditioning Control and Operating Unit, Task
GF83.40-P-2180-01QB Automatic Air Conditioning Control And Operating Unit, Task
- 209.3/4 as of 1.6.04
- except CODE (581) Comfort automatic air conditioning
Component Identification
Task
The AAC [KLA] control and operating unit (N22) controls and regulates all climate control functions for the vehicle interior:
^
Equalizing the temperatures that are preselected and actually present and adjusting the air outlet temperature at the air outlets,
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Automatic switchover from fresh air to air recirculation mode,
^
Electrical actuation of refrigerant compressor,
^
Operating the engine/AC electric suction fan with integrated control
The following additional functions are also regulated by the AAC [KLA] control and operating unit (N22) and the required information is forwarded to
the processing control units via the interior CAN (CAN B):
^
Heated rear window (HHS)
^
Stationary heater (STH) (for vehicles with code (228) Stationary heater)
The AAC control and operating unit (N22) is used to actuate the following:
^
via the interior CAN (CAN B):
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Refrigerant compressor
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Heater circulation pump
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Engine and air conditioning electrical suction fan with integrated control
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Heated rear window
^
via the AC bus:
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Blower regulator
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Actuator motors for the air distribution
The following sensor signals are read in by the AAC control and operating unit (N22):
^
Built-in sensor: in-car temperature sensor (N22b1)
^
direct: evaporator temperature sensor
^
via the AC bus: Air humidity sensor (up to 28.6.06)
The AAC [KLA] control and operating unit (N22) reads in the following signals from the interior CAN (CAN B):
^
By the front SAM control unit with fuse and relay module:
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Outside temperature display temperature sensor
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Refrigerant pressure and temperature sensor
^
By the EIS [EZS] control unit:
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Battery voltage
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Coolant temperature
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Engine speed
^
By the instrument cluster: