Fig. 208 Exhaust Temperature Sensor; Fig. 209; Fig. 210 Control Unit; Fig. 211 Dp 42 Fuel Pump - Webasto Air Top Evo 40 Workshop Manual

Air Top Evo 40 / Air Top Evo 55
2.5 Exhaust temperature sensor
The exhaust temperature sensor is a low-resistance PTC resis-
tor which changes its resistance in dependence on the tem-
perature change of the exhaust gases. This change in
resistance is also used for flame monitoring.
Fig. 208 Exhaust temperature sensor
2.6 Blow-out temperature sensor
The blow-out temperature sensor measures the tempera-
tures in the fin area of the heat exchanger during the entire
heater operation.
The control unit evaluates the signal and regulates the hot air
outlet temperature and controls the overheating switch-off.

Fig. 209

Blow-out temperature sensor
2.7 Control unit
The control unit is the central component for ensuring the
operating sequence.
It monitors the components, evaluates the signals of the sen-
sors and regulates the heating mode.
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Fig. 210 Control unit
2.8 Fuel pump
The fuel pump is a combined pumping, metering and shut-off
system for the heater fuel supply.
The Air Top Evo 40 / Air Top Evo 55 heaters must be operated
with the DP 42 fuel pump.
Fig. 211 DP 42 fuel pump
General Description
203