Webasto DBW 46 Wartungshandbuch PDF herunterladen (Seite 27)

8 Servicin

BBW 46 / DBW 46

810

8.8 First Operation

After heater installation the coolant circuit and the fuel

supply system must be thoroughly bled observing

manufacturer's instructions. During the test run of the air

heater all coolant and fuel line connections are to be

checked for no leakage and tight fit. The coolant line

connections (20 - 27 mm Ø) are to be re-tightened with a

torque of 2.0 + 0.5 Nm. Should the heater during

operation enter an error lockout condition, perform

troubleshooting (see Section 5).

8.8.1 Bleeding the Fuel Supply System

After switch-on of the heater the dosing pump must first

prime the complete fuel supply system. Should the first

start attempt (incl. restart) not yet initiate combustion, the

heater must be switched off and on again (possibly

several times).

A completely empty fuel system may require - dependent

on the length of the fuel lines and the cycle frequency of

the dosing pump - in extreme cases up to 12 minutes

(approx. 50 sec per meter of fuel line with a line diameter

of d

= 2 mm).

Rapid priming of the fuel line may however be achieved as

follows:

– connect the plus connection of the dosing pump to

+30 across a switch button (e.g. order no. 375.004)

(see Fig.)

– continuously alternate switch-on and switch-off to

operate dosing pump until fuel line is primed.

CAUTION

Do not flood heater with fuel.

In case of an empty fuel line with a fuel tank completely

empty the heater should be started several times only with

the vehicle engine running to keep the load on the battery

to a minimum.

+30

Fuse

Dosing pump Switch button

e.g. 375.004

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Webasto DBW 46 Wartungshandbuch Seite 27