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DBW 2010/2020/300 COOLANT HEATERS GENERAL DESCRIPTION
2.1.16 COMBUSTION CHAMBER (20), COMBUSTION
A
IR SWIRLER (21)
Within the burner tube of the combustion chamber, the
air-fuel mixture is burned.
Figure 16: Combustion Chambers
2.1.17 HEAT EXCHANGER (19)
The heat, produced by the combustion process, is
transferred to the coolant (water-antifreeze mixture)
flowing through the heat exchanger.
Figure 17: Heat Exchangers
2.1.18 PREHEAT THERMOSTAT (7)
The preheat thermostat is installed in the burner head on
the back wall (DBW 2010) or on the photo disc (DBW
2020/300). It switches the nozzle holder pre-heating
element (10) on which warms the fuel inside the nozzle
holder to ensure fuel atomization in severe cold
conditions.
Figure 18: Preheat Thermostat
2.1.19 PRE-HEATER CARTRIDGE (10)
The pre-heater is a heating element located in the fuel
nozzle holder. Operated by the preheat thermostat (7), it
heats the fuel inside the nozzle holder when the
temperature drops below 0° C (32° F).
Figure 19: Heating Cartridge
DBW 2010
DBW 2020/300
Air
Swirler
DBW 2010
DBW 2020/300
Preheat Thermostat
(blue and green wires)
Switching temperature
– closes at 0° C (32° F)
– opens at 8° C (48° F)
Power consumption
130 Watts
Red - 12 V
Green - 24 V
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