GF83.40-P-0004SK Convenience Automatic Air Conditioning (C-AAC), Function

GF83.40-P-0004SK Convenience Automatic Air Conditioning (C-AAC), Function
- with CODE (581) Comfort automatic air conditioning


Overall description
The comfort automatic air conditioning system (C-AAC) has an electronically controlled cooling, heating and ventilation system. It controls the interior temperature and the air distribution for the driver and the front passenger.
The system has the following sub-functions:

^ Heating circuit
The coolant is heated up by the engine. The heated coolant is subsequently guided through the heat exchanger, where the heat is emitted into the air in the interior. The coolant returns back to the coolant pump via the heater return.

^ Refrigerant circuit
The refrigerant compressor, which is driven by the engine, compresses the gaseous refrigerant, which is cooled down in the condenser. The refrigerant liquefies during cooling. The liquid refrigerant passes through the expansion valve into the evaporator, where it evaporates, cools down and removes the heat from the air that is flowing past, therefore cooling it down. The refrigerant compressor aspirates the refrigerant which has turned gaseous on account of the heat absorption and then compresses it yet again.

^ Ventilation
The ventilation system ventilates the interior of the vehicle. The air is sucked in by the blower motor and led to the air distribution flaps via various air ducts, from where it is distributed throughout the vehicle interior.

^ Control
The electronic control for the automatic air conditioning is provided by various control units and temperature sensors, which are interconnected via the class B Controller Area Network bus (interior) (CAN-B) and the AC bus. The desired temperature is achieved or maintained at a constant level by cooling or heating the air.

^ Residual engine heat utilization
The residual engine heat utilization allows the vehicle to be heated for up to 30 minutes, even with circuit 15 off or circuit 15C. For this purpose the system utilizes the engine residual heat blowing it through the blower into the passenger compartment.