Webasto Thermo Top C - PME Service Manual download pdf (Page 10)

Thermo Top E and Z/C 2 General Description

2.4 Control Unit / Heat Exchanger

The control unit / heat exchanger includes the

control unit

temperature sensor

overheat protection

heat exchanger

connector terminal.

CAUTION

The control unit / heat exchanger and the burner housing

represent an assembly and must not be disassembled.

2.4.1 Control Unit

The control unit is the central unit and ensures control and

monitoring of combustion operation.

The control unit is ventilated by means of a ventilation

hose routed from the combustion air collector

compartment of the burner.

2.4.2 Temperature Sensor

The temperature sensor senses the coolant temperature

in the heat exchanger of the heater as an electrical

resistance. This signal is routed to the control unit for

processing.

2.4.3 Overheat Protection

Overheat protection, controlled by a temperature resistor,

protects the heater against undue operating temperatures.

Overheat protection responds at a water temperature in

excess of 105° C and switches the heater off.

2.4.4 Heat Exchanger

The heat exchanger transfers the heat generated by

combustion to the coolant circuit.

2.5 Circulation Pump

(Thermo Top E and C only)

The circulation pump ensures circulation of the coolant

within the vehicle and heater coolant circuit. The pump is

activated by the control unit and is in continuous

operation.

Circulation Pump

2.6 Dosing Pump

The dosing pump is a combined delivery, dosing and

shut-off system for the fuel supply of the heater out of the

vehicle fuel tank.

Dosing Pump DP 2 for Fuel operated Heaters

Dosing Pump DP 30.2 for Diesel operated Heaters

Connector Terminal

Control Unit

Heat Exchanger

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Webasto Thermo Top C - PME Service Manual Page 10

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