www.webasto.us 9 Webasto Product N.A., Inc.
DBW 2010/2020/300 COOLANT HEATERS GENERAL DESCRIPTION
2. GENERAL DESCRIPTION
The water heaters Webasto DBW 2010, DBW 2020,
DBW 300 and Scholastic Heater™ are used in
combination with the vehicle’s own heating installation
to:
– heat the passenger compartment
– defrost the windshield
– preheat water-cooled engines
– in self-contained cargo heating applications
The water heater operates independent from the vehicle
engine and is connected to the vehicle cooling system,
the fuel system and the electrical system.
The heater is designed to the heat exchanging principle
and operates intermittently, controlled by the
temperature control thermostat.
The heaters DBW 2010, DBW 2020, DBW 300 and
Scholastic Heater™ basically consist of:
– the combustion air intake (adjustable)
– the combustion air fan and motor
– the fuel pump
– the fuel control valve and solenoid
– the nozzle holder and nozzle
– the ignition coil and ignition electrodes
– the combustion chamber
– the heat exchanger
For control and monitoring, the heater includes:
– a control unit
– an overheat fuse (non-reset)
– a temperature limiter
– a temperature control thermostat
– a flame detector (photo eye)
A coolant circulating pump is installed directly to the
heater or inside an enclosure or on a tray mount.
The heaters may also be equipped with an optional cold
starting aid consisting of:
– a preheat thermostat
– a nozzle holder preheat cartridge
– a relay and wiring harness
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