Webasto Thermo Top V Workshop Manual - Operating Tests
Operating tests
Thermo Top V
602
The following table shows the nominal CO
2
setting value in
full-load combustion operation in dependence on the geo-
detic altitude at which the setting is made.
NOTE
It is recommended that the CO
2
value be set in accordance
with the altitude of the location above sea level.
If the measured value is 0.8 % by vol. outside the setting
value, check the air intake and exhaust system for clogging
or constrictions in the cross section and the delivery rate of
the metering pump (see section 8.6.2.2).
6.3
Operating test in workshop
6.3.1 Testing individual components
6.3.1.1 Testing fan unit
The fan must be tested with the Webasto Thermo Test PC
Diagnosis V 2.08 (or higher) as follows:
Connect the control unit to the Webasto Thermo Test PC
Diagnosis and the operating voltage connector.
Select the component test for the fan motor and operate
the motor at 255 % for at least 60 sec.
Testing of current consumption and running noises.
A diagnosis setting of 255 % is equivalent to 100 % output
of the fan motor.
Current consumption at 255 % and 12 V operating voltage:
max. 3.8 A
No rubbing noises may be heard.
NOTE
The current consumption cannot be read off in the diagno-
sis and must be measured separately with an adapter cable
between the voltage source and the control unit input.
To check the current consumption and running noises, the
fan need not necessarily be removed from the heater.
6.3.1.2 Testing fuel preheating
When testing the cold resistance, a distinction must be
made between Variant 1 heaters without a solenoid valve
and Variant 2 heaters with a solenoid valve. Also see section
For this purpose, the contacts 3 and 4 of connector X6 (see
Fig. 701) of the fuel preheating is connected to a multimeter
and the resistance measured.
In addition, it must also be ensured that the contacts 3 and
4 have no short-circuit to earth with the metal housing of
the burner.
NOTE
When measuring the cold resistance, the fuel preheating
must have cooled down to room temperature.
6.3.1.3 Testing solenoid valve
Only for diesel burners with solenoid valve.
Testing cold resistance:
Connect the contacts 1 and 2 of connector X6 (see Fig. 701)
from the solenoid valve to a multimeter and measure the
resistance.
Cold resistance at 20
±
5 °C: 145
±
9 ohms.
Testing opening state:
Pump fuel via Webasto Thermo Test PC Diagnosis.
The valve is to open when a voltage of 12 V is connected.
In the deenergised state, the valve is closed so that no fuel
can enter the combustion chamber.
Altitude
[m above sea level]
Nominal CO
2
setting value
at 10 ± 10 °C ambient
temperature [% by vol.]
0 10
200 10.2
400 10.5
600 10.8
800 11.1
1000 11.4
Fig. 602 CO
2
setting values
Variant min.
cold
resistance
[ohms]
at 24 ± 6 °C
max. cold resist-
ance [ohms]
at 24 ± 6 °C
1 2,679
3,522
2 0,757
0,967
Fig. 603 Resistance values for fuel preheating
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