Fig. 201 Cross-Sectional Functional Model Of Thermo Top V Water Heater; Fig. 202 Combustion-Air Fan Unit; General Description - Webasto Thermo Top V Workshop Manual

Thermo Top V
2

General description

The heaters operate in accordance with the venturi principle
and use the physical effects of film evaporation and droplet
evaporation for the processing of the fuel-air mixture.
After reaching a coolant temperature of approx. 80 °C, the
heater switches from full load to partial load. In this operat-
ing mode the heater runs especially quietly and more effi-
ciently with regards to electrical and fuel consumption.
Combustion air fan
Control unit
Electrical connection
Combustion air inlet

Fig. 201 Cross-sectional functional model of Thermo Top V water heater

2.1 Combustion-air fan unit/control unit
The combustion air fan supplies the air required for the
combustion process from the combustion air inlet to the
combustion chamber.The combustion-air fan unit contains:
• the heater type label
• the opening for the combustion-air connection piece
and the combustion air pipe
• the control unit with the plug-in contacts for the electri-
cal contact
• the engine and the impeller
For information on checking the fan unit, see section
6.3.1.1.
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Coolant outlet
Venturi burner
Fuel inlet
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The heater consists of the combustion-air fan unit with the
control unit, the heat exchanger with the water connection
piece and the venturi burner.
Coolant inlet
Sensors
Heat exchanger
Glow plug
Exhaust outlet

Fig. 202 Combustion-air fan unit

General description
Burner
201