Webasto Thermo Top V Workshop Manual - Description of Operation
Description of operation
Thermo Top V
302
Fig. 302 Unlocking heater
1. Voltage interruptions by removing the 20 A fuse (yellow)
in the heater-unit wiring harness (ongoing processes in
the control unit are ended)
2. Refit the fuse
3. Briefly press the button on the transmitter or the flame
button on the digital timer (heater switches into the
heater lock-out state)
4. Interrupt the voltage by removing the 20 A fuse (yellow)
in the heater-unit wiring harness (heater lock-out is
released)
5. Refit the fuse (heater in the OFF state)
To start the heater, it must be switched on again!
NOTE
If no Webasto Thermo Test PC diagnosis is available, the
lock-out can also be released without deleting the fault. As
the fault will not be identified without PC diagnosis, it can-
not be specifically eliminated and the heater goes into the
lock-out mode again during the next start-up.
NOTE
As the Thermo Top V auxiliary heater is not switched on
with a heater control, but instead receives the On signal
when the vehicle engine is started, it must be started via the
PC diagnosis following the repairs. To start the heater, the
coolant temperature should not be above 40 °C.
3.4
Starting after long period of non-use
Longer periods of non-use generally have no effect on the
starting function of the heater. However, limitations must
be made here with regard to filling of the fuel lines. Espe-
cially with petrol heaters, the fuel evaporates from the fuel
line in the summer months. As a result, it must be expected
that several complete starting attempts will be required for
initial starting. There is no possibility of lasting damage to
the heater occurring due to longer periods of non-use. If the
limitations specified above are taken into account, a short
combustion operation at regular intervals is not necessary.
IMPORTANT
The vehicle fuel tank should be at least ¼ full during each
starting attempt. A tank fill level below ¼ of the maximum
filling capacity can result in the formation of bubbles and
then false starts and smoking.
3.5
Switching off/Switch-off function
The auxiliary heater is switched off together with the
engine. The additional heater switches itself off via the pro-
grammed heating time or is switched off with the respective
heater control. The combustion is ended and the run-on
begins. In the process, the combustion air fan continues to
run to cool down the heater, the metering pump is switched
off and the solenoid valve is closed so that the flame extin-
guishes. Restarting is not possible until the run-on has been
completed.
NOTE
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.
wait
approx.
3 sec.
ON
ON
wait
approx.
3 sec.
wait
approx.
3 sec.
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