Webasto Thermo Pro 90 Workshop Manual - Thermo Pro 90
Thermo Pro 90
6 Operating tests
601
6
Operating tests
6.1
General
This section describes the tests and adjustments of the
heater and its components in the installed and the removed
state.
WARNING
The heater may not be operated in closed rooms, such as
garages or workshops, without exhaust extraction, not even
with time preselection.
6.2
Operating checks in vehicle
1. Set the vehicle fan to fan speed 1 - 2 or to the speed rec-
ommended in the vehicle-specific operating instructions.
2. Make sure that the fresh-air inlet is clear of foreign bod-
ies (snow, leaves, etc.) and any pollen and dust filters 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. Switch on the heater with the heater control.
When the heater is switched on, the circulation pump
and the combustion air fan run. This is audible. The vehi-
cle fan is switched on by the heater when the coolant
temperature has reached 30 to 50 °C (vehicle-specific).
After a maximum of 240 sec, exhaust can be seen exiting
at the exhaust silencer or connection piece.
5. Allow the heater to run in the combustion mode. Check
the heating effect at the outlet nozzles of the vehicle fan.
NOTE
The heating function is dependent on several factors:
To evaluate it, the outside temperature, the vehicle model,
the engine temperature, the type of integration in the vehi-
cle cooling system, the quantity of coolant to be heated up
and the time since the start must be used for the evaluation.
The coolant temperature determined by the heater and the
coolant or engine temperature indicated by the vehicle may
differ considerably, as the respective sensors are installed at
different locations and may measure different tempera-
tures.
6. Switch off the heater again after approx. 15 minutes
with the heater control.
6.3
Adjusting CO
2
content
NOTE
After repairing the heater and/or replacing the metering
pump, the adjustment of the CO
2
value
should
be checked.
IMPORTANT
After replacing the burner unit, the combustion air fan or
the control unit, the CO
2
value
must
be checked and reset
if necessary.
The Thermo Pro 90 is equipped with an automatic altitude
compensation function. As a result, the permissible operat-
ing altitude for the heater is 0 to 3500 m above sea level.
A change in the factory-defined combustion air quantity is
permissible and can be achieved by changing the CO
2
adjustment value with Webasto Thermo Test PC Diagnosis.
Checking and adjusting CO
2
content
•
Switch the heater into the "CO
2
adjustment" state with
the Webasto Thermo Test PC Diagnosis. The heater
starts automatically and switches into the "combustion
process - combustion process" state. In the process, it
operates the heating capacity level of 9.1 kW, which is
used exclusively for CO
2
adjustment. This means the
heating capacity must remain at 9.1 kW for several
minutes (approx. 10 min.) according to Webasto
Thermo Test PC Diagnosis.
During this the coolant temperature is to be kept as low
as possible. To do this, the greatest heat dissipation
must be ensured with the vehicle fan (fan speed and
passenger compartment temperature at Maximum).
•
Now the CO
2
content must be adjusted as shown in Fig.
When adjusting, the following applies:
– CO
2
adjustment value is increased => combustion air
fan transports more air => CO
2
measured value must
drop.
– CO
2
adjustment value is decreased => combustion
air fan transports less air => CO
2
measured value
must rise.
IMPORTANT
Due to the automatic altitude compensation function of the
heater, the CO
2
adjustment must be carried out exclusively
with the Webasto Thermo Test PC Diagnosis in the "CO
2
adjustment" state.
Visit www.butlertechnik.com for more technical information and downloads.
www.butlertechnik.com