Self-Study Programme 25 Octavia climatronic.pdf

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You will be familiar with the refrigerant circuit of an air conditioning
system from the manual air conditioning of the FELICIA and OCTAVIA.
The fundamental design of an air conditioning system was explained in
Self Study Programme No. 10, while Self Study Programme No. 11
presented the specific air conditioning system in the FELICIA.
The technical perfection of an air conditioning system is the Climatronic.
The main highlight of this version is the electronic control, which performs
the task of blending the cooled and heated air to the desired comfort
temperature, a task which is performed manually on the conventional air
conditioning system.
This also is why the system is called Climatronic.
The principal parameters of the electronic control are the constant
comparison of the temperature between set and actual for the purpose of
automatically regulating the temperature of the air flowing in, of the air
volume and the distribution.
Climatr
E
onic
This fully automatic air conditioning system is presented to you in this Self
Study Programme.
It provides you with information regarding the controls, the operation and
self-diagnosis.
S
2
Contents
Components
Control Unit
Control Panel
Survey of Systems
Temperature Control
Temperature output values
Location of temperature sensors
Sensors
Actuators
New System Control
Air Flow
Diagram of Refrigerant Circuit
Radiator Fan Circuit
Compressor Control
Self Diagnosis
Function Diagram
Climatronic
Fan control
Legend
Test Your Knowledge
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6
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10
12
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13
14
21
24
28
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Service
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OCTAVIA
Service
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OCTAVIA
Service
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OCTAVIA
Service Service
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OCTAVIA
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OCTAVIA
Service Service
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OCTAVIA
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OCTAVIA
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You will find notes on inspection and
maintenance, setting and repair instructions
in the Workshop Manual.
3
Components
The manual air conditioning
The manual air conditioning and the heater unit
are described in Self Study Programme 15 -
SKODA OCTAVIA.
Fresh air/recirculated air flap
A comparison with the Climatronic as a reminder:
–
The comfort level in the vehicle is controlled
manually by the driver.
The flaps for the air flow,
the temperature flap,
the central flap,
the footwell/Defrost flap,
are adjusted by bowden cables.
The fresh air/recirculated air flap is operated
electrically.
The recirculated air mode is limited
mechanically to certain positions of the rotary
switches.
–
SP25-60
–
–
SP25-61
The Climatronic
–
The comfort level (climate in the interior of the
car) is regulated automatically by the control
unit (regulation of temperature and control of
the air volume).
Ram air pressure flap
Fresh air/recirculated air flap
– This is achieved by integrating the appropriate
sensors and positioning motors (actuators) at
the air conditioning unit.
–
The fresh air/recirculated air mode and also
the ram air pressure flap are operated by a
common electric motor.
The central flap is operated electrically.
The system has a self-diagnosis capability.
SP25-30
–
–
SP25-1
4
Location of Climatronic
components (with refrigerant
circuit)
This general view indicates the installation points
in the engine compartment or interior:
1
2
3
4
F14
F129
G17
G56
G89
G107
J255
J293
N25
Compressor
Condenser
Receiver/drier
Expansion valve
Coolant temperature warning switch
(overheating)
Air conditioning pressure switch
Ambient temperature sensor
3
Dash panel temperature sensor
Fresh air intake duct temperature sensor
2
Sunlight penetration photo sensor
Climatronic control unit
Radiator fan control unit
Air conditioning magnetic clutch
4
F129
(G65)*
G89
G107
J255
+G56
F14
J293
N25
1
G17
SP25-20
(G65)* High-pressure sensor
(only with new system control, then
replaces F129)
This general view shows the components located
at the AC unit:
G89
G192
J126
V2
V68
V70
V71
V85
Fresh air intake duct temperature sensor
Footwell vent temperature sensor
Fresh air blower control unit
Fresh air blower
Temperature flap positioning motor
Central flap positioning motor
Ram air flow flap and recirculated air flap
positioning motor
Footwell/Defroster flap positioning motor
G89
V85
V71
V2
J126
G192
V68
V70
SP25-21
5
Control Unit
Control unit with operating and
display unit
Climatronic control unit J255
O
AUT
C
I
RON
MAT
LI
C
ECO
N
Temperature sensor blower
V42
Dash panel temperature sensor
G56
Operating and display unit
E87
SP25-6
Function
The Climatronic control unit is supplied with
information from the electrical and electronic
components (sensors). This information is
processed in accordance with the set values
stored in the control unit. The output signals of
the control unit then operate the electrical
components (actuators).
The Climatronic control unit J255 is located
directly at the operating and display unit E87.
Both units form a single component which cannot
be disassembled.
The temperature sensor for the interior
temperature of the car is known as the "dash
panel temperature sensor" and is integrated in
the control unit.
A blower for extracting the air inside the control
unit is located directly at the temperature sensor.
The temperature sensor is positioned in the air
flow of the blower in order to avoid incorrect
measurements.
The control unit features a fault memory.
This makes it possible to rapidly determine
whether a component has failed or whether an
open circuit exists, by means of the self-diagnosis
facility.
A fault which has a sustained effect on the
operation of the Climatronic, is stored and
displayed.
The fault is displayed when the ignition is
switched on by the entire display of the display
unit flashing for about 15 seconds.
No matter what type of fault occurs, the
Climatronic control unit maintains the set
operation in the emergency mode.
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