Heat Exchanger; Burner Insert With Combustion Pipe; Control Unit; Flame Sensor (Gasoline Heaters Only) - Webasto Air Top 2000 ST D Service And Repair Manual

GENERAL DESCRIPTION
2.2 H E
EAT XCHANGER
The heat generated by the combustion process is
transferred to the air transported by the combustion and
hot air blowers in the heat exchanger.
Figure 4:

Heat Exchanger

2.3 B I
URNER NSERT WITH
The fuel is distributed over the burner cross-section in the
combustion pipe in the burner insert. The mixture of fuel
and air burns in the combustion pipe, thus causing the
heat exchanger to become hot.
Burner insert
Figure 5:

Burner Insert with Combustion Pipe

Webasto Product N.A., Inc.
C P
OMBUSTION IPE
Combustion
pipe
2.4 C U
ONTROL NIT
The control unit is the central component for ensuring
the function is maintained and for monitoring the
heater's operation. A temperature sensor in the control
unit is designed to control the room temperature. An
external temperature may also be connected to all the
heaters.
If a fault occurs, an error code will be output in the
display of the combination timer. If the heater has a
control element, the ON control light will flash.
In addition, the heater can be checked using a personal
computer (see PC heater diagnostic operating manual).
Wiring
harness
Figure 6:

Control Unit

2.5 F S
LAME ENSOR
The flame sensor is a low-ohm PTC resistor, which
changes its resistance depending on the heat emitted by
the flame.
This change in resistance is analyzed by the control unit
so that the flame status is monitored whenever the
heater is operating.
Figure 7: Flame Sensor
6
AIR TOP 2000 ST
Internal
temperature sensor
Component
plug sockets
(G H O
ASOLINE EATERS
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