www.webasto.us 11 Webasto Product N.A., Inc.
DBW 2010/2020/300 COOLANT HEATERS GENERAL DESCRIPTION
DBW 2020
DBW 300
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23242526
1. Electronic control unit
2. Motor
3. Electronic ignition unit
4. Coupling (clutch)
5. Combustion air fan
6. Toothed gearing
7. Preheat thermostat (blue and
green wires)
8. Fuel control valve and solenoid
9. Electrode holder
10. Pre-heater
11. Coolant outlet
12. Bleeding valve
13. Ignition electrodes
14. Fuel nozzle
15. Overheat fuse (white wires)
16. Temperature control thermostat
(green and red wires)
17. Temperature limiter
(green wires)
18. Coolant inlet
19. Heat exchanger
20. Combustion chamber
21. Combustion air swirler
22. Exhaust outlet
23. Flame detector
24. Fuel pump
25. Fuel pipes
26. Combustion air intake with
adjusting shutter