Restarting After Fault Lock-Out; Starting After Long Period Of Non-Use; Switching Off/Switch-Off Function - Webasto thermo top evo Workshop Manual

3 Description of operation
3.3

Restarting after fault lock-out

After the fault cause has been eliminated, the heater must
be switched on again with the normal switch-on signals.
This does not apply after overheating or if a fault occurs sev-
eral times without intermediate combustion operation.
3.4

Starting after long period of non-use

Longer periods of non-use have no effect on the starting
function of the heater. However, limitations must be made
here with regard to filling of the fuel lines. Especially with
petrol heaters, the fuel evaporates from the fuel line in the
summer months. As a result, it must be expected that sev-
eral complete starting attempts will be required for initial
starting. Commissioning must them be carried out with the
Webasto Thermo Test PC Diagnosis.
Prime the heater with fuel using the Webasto Thermo Test
PC Diagnosis:
Press the fill line button and fill the lines until fuel is present
at the heater.
3.5

Switching off/Switch-off function

When a switch-off signal is received, when the burn-out
temperature is reached, when the set heating time is
reached or if faults occur, combustion operation is ended
and a burn-out is initiated. In the process, the control of the
fuel metering pump is immediately interrupted and the fan
speed is decreased. After the burn-out is complete the fan
speed is increased to cool the combustion chamber.
The run-on time and the combustion-air fan speed are
dependent on the heater model and operating mode from
which the heater is switched off.
Switch-off or new switch-on signals are processed accord-
ing to the following rules:
1. A switch-off signal on a heater control always as priority
irrespective of the heater operating state.
2. If the original switch-on signal is no longer active, or if
the included heating duration has expired, then this is
interpreted as a switch-off signal.
3. New switch-on signals are ignored until the original
switch-on signal is no longer active.
4. It is therefore not possible to change the heating time
during operation. The heater must be switched off and
then on again with the changed heating duration.
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NOTE
5. If the heater has been started as an auxiliary heater, then
switching off the vehicle engine must be interpreted as
a switch-off signal (legal requirement).
6. A restart of the heater is not possible until after the burn-
out has completed and the first cooling phase (forced
run-on) has been ended. New switch-on signals are tem-
porarily stored and are not followed until then.
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Thermo Top Evo