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and cools off the hot parts on the exhaust side of
the heat exchanger, while the water circulation
pump still running transmits the heat present in
the heat exchanger, thus
overheats. Once the delayed cutout time is over,
both the combustion air blower and the water
circulation pump switch off automatically. A cutout
will take place in case of any failure of the
preheater.
WEBASTO:
Description of operations
Switch on the heater, the operation indicator lamp
comes on and the heater motor & circulating
pump begin to run. After about 10-25 seconds the
solenoid valve opens and fuel is sprayed into the
combustion chamber.
electronic ignition unit produces high voltage
(8000V) and the mixture of fuel and air in the
combustion chamber is ignited by the spark on the
ignition electrodes. The flame is indicated by the
flame detector, then the electronic ignition unit
stops producing high voltage and combustion
continues by itself (spark on electrodes is required
only to ignite the flame).
heater is working and produces heat.
If the heater is switched off by the on/off switch,
the
solenoid
valve
combustion stops and indicator lamp turns off.
Combustion air fan still blows air, cleaning the
combustion chamber of any fumes and cooling
down
the
combustion
circulation pump pumps coolant, making a purge
cycle
for
approximately 2-3
protecting the heater against overheating.
If the heater is not switched off by the on/off
switch, the control thermostat will switch off the
heater when coolant temperature reaches 165° ±
6° F (75° ± 3° C) and turns it on at 154° ± 9° F
(68° ± 5° C).
During this time the heater
(combustion) is off, the indication lamp and
coolant pump are on. Combustion air fan blows
air for 2-3 minutes and then turns off.
WINDSHIELD WASHER
RESERVOIR
Windshield washer reservoir is located in front left
compartment
(steering
driver's floor.
This reservoir has a capacity of
preventing local
At the same time the
At this moment the
interrupts
fuel
supply,
chamber.
Coolant
minutes,
thus
compartment)
below
STARTING AND STOPPING PROCEDURES
approximately 5 U.S. gallons (18,9 litres).
spin-on type cover is provided with a removable
cap to ease windshield washer reservoir filling.
Reservoir supply should be checked regularly.
Spray jets are mounted under windshield wiper
arms.
The reservoir's fluid is forced by air
pressure through rubber tubes into spray jets and
onto windshield.
4 - 15
Its
23011
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