Technical data

A ANNEX DBW 2010 / 2012 / 2020 / 2022 / 300 / 350
A-2
The Periodical Maintenance of the Heating
Device
The heating device must be checked in regular intervals
but at least at the beginning of the heating season (this is
the period, in which the heating device will be used as a
result of the climatic conditions).
The maintenance intervals indicated below apply for the
normal utilization of the busses under the normal
conditions. These intervals may be shortened or
prolonged if the heating devices will be used in other
vehicles or for other purposes. Please contact your
Webasto authorized representative in such cases.
Result of the
Check
Checking / Maintenance Tasks Important Warnings
OK NOT OK
Measured values,
repair tasks to be
carried out
1.The electrical connections
a) Remove the electrical socket connections of the cable bunches, check
to see whether or not there is oxidation, spray it and install once again
after having implemented the Article 5.
b) Check the oxidation or the transmission resistances of the electrical
fuses.
Use the proper contact spray,
for instance, Special Contact
Spray (Order Number 101322)
2. The Heat Exchanger
a) Check whether or not there are dark burn stains on the paint (local
excessive heating)
b) Check to see if there is any trace of leakage
c) Clean the heating device from outside and inside
Identify the reason of excessive
heating if necessary (for
instance, water circuit); check
the heat constrainer
3. The fuel system
a) Check the imperviousness or the fuel lines and connections
b) Replace the fuel filter element together with the gasket
c) Open the fuel valve, if any
d) The fuel pump and fuel lines
e) Replace the fuel sieve in the pump together with the gaskets
Pay attention that the incoming
and return fuel lines do not leak!
Tighten the screwed
connections and hose clamps.
Replace the pump and line once
every 5 years
4. The heater head
a) Check to see whether or not the combustion air suction clearance is
free
Open the burner head to the side
b) Check inside the body to see if any fuel is collected resulting from
leakage
c) Clean the observing glass of the flame regulator
d) Check the status of the ignition electrodes
e) Replace the vaporizer nozzle
Replace the bended electrodes.
Shorten the interval for
replacing the fuel filter if soot will
be collected.
5. The exhaust system
a) Check to see whether or not the exhaust line is free and clean if
necessary
b) Take the combustion chamber off the heat exchanger. Check to see if
there is any damage on both parts and clean or replace if necessary
c) Install the combustion chamber and the burner head. Pay attention that
the connection of the heat exchanger is tight.
d) Re-install the electrical socket connections
6. The water system
a) Clean the water filter element, if any
b) Open the water valves, if any
7. The function check
a) Open the valve in the return line, if any
b) Check the work of the heating device
c) Pay attentions to see if smoke is produced during the post-operation and
replace the nozzle if necessary
After approximately 10 minutes
of warming up.