W
EBASTO
S
CHOLASTIC
S
ERIES
3FUNCTIONAL DESCRIPTION
3-1
3. Functional Description
3.1 Operating your Webasto Scholastic Heater
Before switching the Webasto 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 instrument panel of the vehicle, the heater can be operated
by the following methods.
WARNING
Due to the risk of carbon monoxide poisoning and asphyxiation, the heater must never be operated in closed spaces
such as garages and workshops without adequate exhaust extraction.
WARNING
Due to the risk of fire or explosion, the heater must be switched off while refueling and at fueling stations.
WARNING
Due to the risk of explosion, the heater must never be operated in areas where explosive materials, fumes or dusts
may be present.
3.2 Switching On
Timer: Switch:
Using a Timer:
Upon pressing the “Instant Heat” button on the timer face, the “Operation Indicator” on the timer lights up and the
heater begins operation.
Using a Switch:
When the switch is used for switching “ON” the Webasto heater, the “Operation Indicator” integrated in the switch is
illuminated.
Heater Start-up Sequence:
The heater motor and coolant circulating pump begin operation. After approximately 10 to 25 seconds the fuel
solenoid valve opens and fuel is sprayed into the combustion chamber. At the same time, the electronic ignition coil
produces a high voltage (8000 V) spark at the tip of the ignition electrodes and the mixture of fuel and air in the
combustion chamber is ignited. As soon as combustion is detected by the photo resistor (flame detector), the
electronic ignition coil is de-energized and combustion continues on its own (ignition process is only required to ignite
the flame). At this point the heater is working and producing 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 10.5V.
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 (as would
happen during an overheat situation).
