The Phaeton Heating and Air Conditioning System
Service.
Self-Study Programme 271
The Phaeton Heating and Air Conditioning System
Design and Function
An outstanding climate
As a luxury performance saloon, the Phaeton is fitted with a four-zone cabin climate as standard. Using the 4C (4 Corner) Climatronic, both driver and passengers can set their own personal climate regardless of the climate in the other seats.
The automatic control for each individual climate zone is provided by the Climatronic control unit, which also activates a large number of control motors for vents and temperature flaps.
The adaptive control includes, for example, sunlight penetration, air quality and air humidity. All in all, the air conditioning system improves driving safety, as concentration and reaction speed drop as temperature increases.
NEW
The Self-Study Programme involves the design and function of new developments. The contents are not updated.
Please always refer to the relevant Service Literature for all inspection, adjustment and repair instructions.
2
S274_101
Important Note
Table of contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Design features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Functional features . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 System overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 Control unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 Sensors and actuators. . . . . . . . . . . . . . . . . . . . . . . . . 48 Function diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Self-diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 Test your knowledge . . . . . . . . . . . . . . . . . . . . . . . . . . 73
3
Introduction
Operating concept
The functions of the Climatronic are activated via the operating unit of the Infotainment system. The Infotainment is a central electronic system that manages the wide range of different functions in the vehicle such as the heating and air conditioning system, car phone, navigation, radio, television etc.
Front information display and operating unit
The core of the Infotainment system is the front information display and operating unit in the dash panel. It can be used to make all the settings for the heating and air conditioning system for the front and rear seats. The operating elements for climate control are highlighted in the adjacent illustration.
In the Service Literature, the operating unit is referred to as the "Front information display and operating unit control unit".
21.5?C NDR 2 22. 0?C
MAN
AUTO
ECON
MANUAL Other
S271_074
Rear information display and operation unit
In the version illustrated, this is for adjusting temperatures and air distribution in the rear compartment as well as for blower settings.
In the Service Literature, the rear compartment operating unit is referred to as the "Rear Climatronic control and display unit."
MAN
AUTO
24
.?C
0
22.?C
MANUAL
0
S271_216
Although the optional extras "sunroof " and "auxiliary heater" are also adjusted using the front information display and operating unit, they are not described in this Self-Study Programme. .
4
Ventilation concept
In order to ensure a pleasant climate in the passenger compartment, the ventilation concept is split into four basic functions.
indirect ventilation direct ventilation defrost function with
window fogging detection automatic and manual
air recirculation function
With this concept, the ventilation and temperature can be adjusted separately for each seat.
As the ambient conditions can change considerably during a journey as regards temperature or sunlight penetration, it is possible that, when the air conditioning mode is running, the basic functions of indirect ventilation, direct ventilation and defrost may merge or run simultaneously.
24?C 18?C
22?C 23?C
S271_083
S271_219
5
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