Combustion-Air Fan Unit/Control Unit; Burner Unit; Fig. 202; Fig. 203 Burner Unit - Webasto thermo top evo Workshop Manual

2 General description
2.1

Combustion-air fan unit/control unit

The combustion-air fan unit contains:
• the heater type label
• the connection piece for the combustion air pipe
• the control unit with the plug-in contacts
• the engine and the impeller
The combustion air fan supplies the air required for the
combustion process from the combustion air inlet to the
combustion chamber.
It is not permissible to dismantle the combustion-air fan
unit.
2.2

Burner unit

The fuel-air mixture is processed and the actual combustion
takes place in the burner unit. The fuel flows via the fuel
pipe to the evaporator, is distributed there and is evapo-
B4
B5
202
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NOTE
B1

Fig. 202

Combustion-air fan unit
rated using the glow plug. The air required for combustion
is provided by the combustion-air fan unit and flows into the
combustion chamber via holes in the burner.
B2 B3
Pin 2
Pin 1
B9

Fig. 203 Burner unit

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Thermo Top Evo
B1 = Combustion pipe
with evaporator
mount and evapora-
tor
B2 = Retaining spring for
glow plug
B3 = Cooling flag for glow
plug
B4 = Glow plug/Flame
monitor
B5 = Fuel pipe
B9 = Connector for glow
plug/flame monitor