Operating instructions

2. Operating your Webasto Heater
Before switching the Webasto water heater on, set vehicle heating
system to the “heat” position and open any shut off valves. Depending
on the type of control installed in the of the vehicle, the heater can be
operated by the following methods.
2.1 Switching On
Using a timer: Using a switch:
Timer Switch
Upon actuation of the “instant heat” button the “operation
indicator” on the timer lights up.
Or
When the switch is used for switching “ON” the Webasto heater, the
operation indicator integrated in the switch is illuminated.
The heater motor and coolant circulating pump begin to run. After
approximately 10-25 seconds the solenoid valve opens and fuel is
sprayed into the combustion chamber. At the same time, the
electronic ignition coil produces high voltage (8000 V) and the mixture
of fuel and air in the combustion chamber is ignited by a spark
produced at the tip of the ignition electrodes. The flame is detected by
the photo cell, then the electronic ignition coil stops producing high
voltage and combustion continues by itself (spark on electrodes is only
required to ignite the flame). At this point the heater is working and
produces heat.
The Webasto heater will cycle on and off until:
1. The Webasto heater is switched off.
2. Time has elapsed on the timer.
3. The vehicle battery voltage drops below 20.0V.
4. The Webasto heater runs out of fuel.
5. A fault lock out occurs, indicated by the operating indicator light
being off during the cool down cycle (i.e. overheat).
WARNING
Due to the danger of
poisoning and asphyxiation
the heater must not be
operated in enclosed
spaces such as garages or
workshops without
adequate exhaust
extraction.
WARNING
The heater must be
switched “OFF” while
refueling and at fueling
stations.
WARNING
Do not operate any
Webasto heater in an area
where toxic or explosive
materials or fumes may be
present.
Thermo 230/300 2 Operating your Webasto Heater
201