Webasto DBW 46 Repair Manual download pdf (Page 16)

Webasto Thermo & Comfort N.A., Inc. 16 www.techwebasto.com

GENERAL DESCRIPTION DBW 2010/2020/300 COOLANT HEATERS

2.1.12 FUEL NOZZLE AND NOZZLE HOLDER (14)

The fuel atomizing nozzle is screwed into the nozzle

holder. Under pressure, the fuel nozzle atomizes the fuel

entering the combustion chamber.

Figure 12: Nozzle Holder and Nozzle

2.1.13 FUEL LINE CONNECTIONS (25)

Fuel lines from the fuel tank are connected to the suction

and return pipes of the heater in the case of the DBW

2010/2020/300.

The Scholastic Series heater use a single fuel line that is

connected to the suction pipe of the heater. There is no

return fuel line on this model.

Figure 13: Fuel Pumps

2.1.14 ELECTRONIC IGNITION UNIT (3)

The electronic ignition unit develops high voltage of

approximately 8000 volts to produce a spark at the tips

of the ignition electrodes. The electronic ignition unit is

only in operation during the starting phase.

IMPORTANT! Never switch on the electronic

ignition unit without being connected to the

ignition electrodes!

Figure 14: Electronic Ignition Unit

2.1.15 IGNITION ELECTRODES (13)

The ignition spark is formed between the points of the

ignition electrodes, thus starting the combustion process.

Figure 15: Ignition Electrodes and Setting Gauge

Nozzle

Nozzle Holder

Dual Line System

(DBW 2010/2020/300)

Single Line System

(Scholastic Heater)

+ Black Wire

– Brown Wire

Setting Gauge

Electrodes

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 71 72

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Webasto DBW 46 Repair Manual Page 16