5 Series E60 530d (M57TU) SAL
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Refrigerant pressure sensor
This sensor is located in the pressure line between the condenser and the evaporator. Depending on the sensor
signal, the A/C compressor is switched off by the IHKA control unit in the event of excessively high system
pressure.
Control unit:
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IHKA controls / control unit
The IHKA controls and the IHKA control unit are combined in a single component. The Basic and High versions
have different IHKA controls. [more ...]
Actuators:
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Electric auxiliary heater
The heating elements of the electric auxiliary heater are integrated into the heating system heat exchanger and
directly heat the air drawn in to control the temperature of the air inside the vehicle. [more ...]
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Flap motors
On the IHKA Basic, 6 flap motors control the ventilation flaps. The IHKA High has 9 flap motors due to the
left/right separation for the driver's side and the front-passenger side and because of the additional rear
compartment flap. [more ...]
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Blower with blower output stage
The blower generates the necessary airflow. The blower is installed after the evaporator in the heating/air-
conditioning system (suction fan) and is equipped with 2 blower wheels.
The blower output stage is fitted directly on the blower motor housing. The blower output stage is capable of
self-diagnosis. The blower output stage is actuated by the IHKA control unit (via the LIN bus). The blower output
stage controls the blower motor with a pulse-width modulated signal (PWM signal).
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A/C compressor
The A/C compressor compresses the refrigerant drawn in from the evaporator and presses it to the condenser.
The A/C compressor used is clutch-free. That means that the A/C compressor always runs with the engine. A
swash plate in the A/C compressor allows the output to be smoothly regulated. To reduce load, only the cooling
output actually needed is generated. [more ...]
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Evaporator
The evaporator plates are cooled by the refrigerant that has been evaporated inside the evaporator. The airflow
generated by the blower is fed over the cooled evaporator plates. The air is cooled and dried and fed into the
vehicle.
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Auxiliary water pump
The auxiliary water pump serves to make sure that the coolant flow rate needed in the heater circuit is
maintained, even at low engine speeds.
On vehicles with diesel engine and independent heating (option 536), there is no auxiliary water pump in the
engine compartment. Its job is assumed by the independent heaters auxiliary water pump and is controlled by
the independent heating control unit.
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Water valve
The water valve works electromagnetically and meters the coolant flow rate to the heating system heat
exchanger as it is needed. This determines the temperature of the air used for heating the vehicle interior.
On the IHKA High, a dual water valve is used for the left/right separation of the heating system heat exchanger.
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Switchover valve
The switchover valve is only installed if the vehicle is equipped with independent heating (option 536).
The switchover valve regulates the inlet to the independent heating as follows:
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From the radiator and the auxiliary water pump
or
SBT Integrated automatic heating / air-conditioning system (IHKA), Basic and High E6
BMW AG - TIS
22.02.2013 10:53
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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