Webasto DBW 46 Repair Manual download pdf (Page 9)

www.webasto.us 9 Webasto Thermo & Comfort 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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Webasto DBW 46 Repair Manual Page 9