Webasto Thermo Top V Workshop Manual - Thermo Top V
Thermo Top V
Operating tests
601
6
Operating tests
6.1
General
This section describes the tests of the heater and its compo-
nents in the installed and the removed state.
WARNING
The heater must not be operated in enclosed areas such as
garages and workshops without an emissions extraction sys-
tem.
6.2
Operating checks in vehicle
6.2.1 Testing heating mode
1 Make sure that the vehicle fan speed is set to the slowest
or to the speed recommended in the operating instruc-
tions.
2 Make sure that the air ducting to the heater is clear of
foreign bodies (snow, leaves, etc.) and any pollen and
dust filter are clear.
3 Make sure that the coolant circuit and the fuel system
are carefully bled in accordance with the vehicle manu-
facturer's specifications.
4 Make sure that the fuel fill level is not at Reserve (1/4 fuel
tank capacity) and the operating voltage is greater than
11.5 V.
5 Switch on the heater with the heater control or the
Webasto Thermo Test PC Diagnosis.
6 When the heater is switched on, the circulating pump
and the combustion air fan run (perceptible by listening).
The vehicle fan runs when the coolant temperature has
reached approx. 40 °C to 50 °C.
7 The heater then starts after approx. 130 sec. This can be
detected from exhaust exiting at the exhaust silencer or
connection piece.
8 Allow the heater to run. Check the heating effect at the
air outlet of the vehicle fan.
NOTE
The heating effect is dependent on several factors:
To evaluate it, the outside temperature, the vehicle
model, the engine temperature and the type of integra-
tion in the vehicle cooling system, the quantity of coolant
to be heated up and the time since the start must be
used for the evaluation.
9 Switch off the heater again with the heater control or
the Webasto Thermo Test PC Diagnosis.
• The run-on is activated with the heater is switched
off. This is apparent from the fact that exhaust stops
exiting and the circulating pump continues to run
(perceptible by listening).
• Then the heater is switched off completely (with the
auxiliary heater, with the ignition switched off).
6.2.2 Setting CO
2
content
The heater is optimally set to a CO
2
value for operation at
altitudes between 0 and 1,000 m above sea level at the fac-
tory. Continuous operation above 1,000 m above sea level
can result in heavy smoking and soot formation and in fail-
ure of the unit.
IMPORTANT
After replacing the fan unit or the control unit, the CO
2
value must be reset in full-load combustion operation!
NOTE
The CO
2
value of the exhaust gas must be measured only
after the heater has operated in full-load combustion for
approx. 8 min. Measure the CO
2
approx. 20 mm from the
end of the exhaust outlet using a CO
2
meter (e.g. from MSI).
The CO
2
setting is carried out with Webasto Thermo Test PC
Diagnosis.
Fig. 601 CO
2
setting
NOTE
The hose
-2-
of the exhaust probe may not hinder the
exhaust from exiting the exhaust pipe
-1-
during the test.
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