Webasto DBW 46 Service Manual download pdf (Page 15)

BBW 46 / DBW 46

6 Functional Checkouts

601

6. Functional Checkouts

6.1 General

This section describes the tests and adjustments on the

heater in installed and removed condition to prove its

serviceability.

WARNING

The heater must not be operated in closed areas like

garages or workshops not provided with exhaust

ventilation facilities.

6.2 Adjustments

6.2.1Adjustment of CO

Contents

Changing the combustion air quantity preset by the

manufacturer is permitted and may be achieved by

rotating the air set screw.

Adjustment Procedure

Clockwise rotation: CO

contents decreases (prior to

measurement allow heater to operate for approx. 5 min).

Coarse setting: screw in until flush with surface, then

rotate screw back one turn.

NOTE

Perform adjustment in full load operation only. Set CO

adjustment value in combination with a smoke spot

number of close to "1".

6.3 Components Testing

6.3.1Temperature Sensor Resistance Check

During electrical testing with a digital multimeter the

temperature sensor should have the following resistance

in accordance with the diagram below.

Test current < 1 mA.

6.3.2Flame Sensor Check

During electrical testing with a digital multimeter the flame

sensor readings should be as follows:

flame sensor "dark" approx. 12 V or 24 V

flame sensor "bright" approx. 1 V.

500

750

1000

1250

1500

1750

–40 0 40 80 120

8035 Stockdorf

Steuergeraet

SG 1560/12V

23004

5HB 004 327-08

Nicht werfen !

Made in W.-Germany

BC D

654

321

876

432

Resistance

Water temperature

Heater On 12 V or 24 V

after 14...26 sec close to 1 V

Heater On 12 V or 24 V

after 14...26 sec close to 1 V

Heater On 12 V or 24 V

after 14...26 sec close to 1 V

Heater On 12 V or 24 V

after 14...26 sec close to 1 V

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 39 40

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