X Series E70 X5 3.0Sd (M57T2) OFFRD
separate heating system is available for the third row.
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Climate control
The heating / climate control system is a water regulated heating/climate control system. The performance of the
system has been improved compared with that of the E53 with respect to cold output, heat output and comfort
(air distribution and acoustics).
In principle, 3 versions of the heating / climate control system are available:
•
IHKA Basic, integrated automated heat / climate control system (1-zone)
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IHKA High, integrated automated heat / climate control system (2-zone)
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IHKA High with automatic climate control system for rear seat FKA (4-zone)
FKA is the automatic rear seat climate control system and is a separate control device for the rear seat. This
control unit supports individual heating / air-conditioning options for the passengers in the rear seats.
IHKA Basic supports uniform temperature setting, blower control and air vent control on the driver and front
passenger sides. The entire passenger compartment is regulated according to these settings as a single zone
(1-zone).
IHKA High supports separate settings on the left and right for temperature and vent control or control for driver
and front passenger.
The passenger compartment is correspondingly regulated in 2 zones (2-zone).
The rear passengers also have the option of setting different temperatures on the right and left and can control
the blowers in the back of the car separately by means of the optionally available automatic rear seat climate
control system.
The passenger compartment is correspondingly regulated in 4 separate zones (4-zone).
A separate heating and ventilation system is also available for the optional 3rd row (E70 only).
Heating is provided in versions with diesel engines with a separate electrical heater based on the PTC principle.
If a parking heater system is installed, the electrical PTC heater is omitted in diesel versions.
Due to measures to reduce CO2 emissions, the A/C compressors are installed with a magnetic coupling (not for
N62B48O1).
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Parking heater
The parking heater comprises the independent auxiliary heater and the associated components and power
supply.
The parking heater is incorporated in the integrated automatic heating / climate control system (IHKA).
The main element of the new independent auxiliary heater is a Venturi burner. This optimises the entire
combustion process to make it considerably more efficient than compared to previous burner technology.
The Junction Box Electronics (JBE) controls the water valve to meter the coolant throughflow for the heat
exchanger
The water valve operates electromagnetically and meters the coolant flow rate to the heating system heat
exchanger as it is needed. This determines the air temperature used for heating the vehicle interior.
In the case of automatic air conditioning with separate adjustment for the driver and passenger sides, a duo
water valve is installed on account of the left/right separation of the heat exchanger.
After starting, the parking heater runs in full-load operation. If the temperature in the heating circuit of the parking
heater reaches approx. 80
°
C it switches over to part-load operation.
New from 04/2007:
SBT Electrical systems E70, E71
BMW AG - TIS
06.02.2013 01:03
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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