Windshield Washer Reservoir - PREVOST Motorcoach XL Series Operator's Manual

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 preventing local 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
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
approximately 5 U.S. gallons (19 liters).
spin-on type cover is provided with a removable
At the same time the
At this moment the
interrupts fuel supply,
chamber. Coolant
2-3 minutes, thus
compartment) below
STARTING AND STOPPING PROCEDURES
cap to ease windshield washer reservoir filling.
Check windshield washer fluid level regularly.
Spray jets are mounted under windshield wiper
arms. The reservoir's fluid is forced by two electric
pumps through rubber tubes into spray jets and
onto windshield.
FIGURE 80
Its
4 - 14
23011