Self-Study Programme 280 Phaeton auxiliary heater top c and top z.pdf

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Service.
Self-study programme 280
The Phaeton
Auxiliary heater Thermo TOP C and
supplementary heater Thermo TOP Z
Design and function
The use of heater units that work
independently of the engine is continually rising.
They are offered as an accessory for retrofit or as
an optional extra by the manufacturer.
The petrol engine Phaeton features an auxiliary
heater as an optional extra that heats the interior
when the engine is not running.
For diesel engines, the Phaeton is fitted as
standard with a supplementary heater that
boosts coolant heating when the engine is
running.
In this way, the operating temperature of the
engine is reached faster and is maintained
throughout operation at an equal level.
This self-study programme provides you with an
overview of the auxiliary heater and the
supplementary heater installed in the Phaeton.
S280_053
NEW
Important
Note
This self-study programme explains the design and
function of new developments.
The contents will not be updated.
Please refer to the relevant service literature for
current inspection, adjustment and repair instructions.
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Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Coolant circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Operating stages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Deactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Functional diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Explanation of highlighted terms
Test yourself . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
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Introduction
The auxiliary heater
The auxiliary heater is a wise choice as an
accessory. The heater and ventilation function
provides a comfortable environment in the
interior, which is available as soon as you climb
into the vehicle.
Frosted or steamed up windows inhibit all-round
view. Therefore, they are a considerable risk in
traffic situations.
Heavy winter clothing, when worn in the vehicle,
results in loose seat belts as they are no longer
comfortably taut against the body. The optimal
efficiency of the seat belt is markedly impaired.
A further disadvantage is that unsuitable
clothing restricts freedom and thereby also the
ability to react quickly to given situations.
S280_013
By heating up the interior before the journey is
started, the windows are cleared.
Good all-round view is guaranteed.
Less restrictive clothing in a preheated vehicle
increases the efficiency of seat belt protection
and reaction time of the wearer.
S280_012
Further, use of an auxiliary heater is financially
viable. In many regions, the temperature on
100 days of the year is less than +5 °C, which
equals a third of a year of operation.
4
The supplementary heater
The diesel engines in the Phaeton feature
a heater that works to boost heat.
When the engine is started, the coolant is heated
additionally by the supplementary heater.
This helps diesel engines to make use of their
good efficiency and reach their operating
temperature in a short space of time.
The heat generated from the combustion process
is an unavoidable side-effect. The energy stored
within is converted partly into heat instead of
power.
This has the effect of reducing the degree of
efficiency.
Direct injection diesel engines reach a high level
of efficiency thanks to their optimised combustion
process. The use of a supplementary heater
supports the high level of efficiency in the engine
by heating of the coolant. In addition,
the passenger compartment is heated
comfortably.
5

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