Service manual

Webasto Diese Cooker X 100 7 Maintenance and service
702
5. Soot test
The soot test determines whether the combustion is
pure.
You can perform the test with a
A CO-meter (you can compare the result to the
nominal value in technical information)
B Soot test pump
Instructions to use of soot test pump
Place the test pump’s suction hose into the
combustion pipe hose and take a sample by slowly
and fully pumping the pump 10 times. The result
must be 0 with the exception of the first 5 – 6
minutes after start-up when a small amount of soot
can be accepted.
In an burner that functions properly, the formation of
soot stops when glowing stops. If the device
becomes sooty, the fuel input may be too much or
not enough, the combustion air input has been
adjusted incorrectly, or there is an air gap in the
channels for the combustion air input, or some other
reason. See the “Troubleshooting chart”.
The combustion air input can be analyzed and
adjusted according the instructions in check point 4.
B Adjust the device to the maximum and let it
run for 10 min to reach the operation tem
perature. When the device has reached its
maximum operation temperature, measure
the combustion and, if needed, adjust the
maximum rotation speed of the burning fan
with the “ANGLE” trim.
a. Turning the trim counter-clockwise will
decrease the rotation speed of the burning
fan, turning it clockwise will increase the
rotation; the adjustment range is approxi
mately ± 5 %.
b. Measure the combustion again.
Combustion air adjustment
A Adjust the device to minimum and let it run at
the minimum for 10 min to reach the opera-
tion temperature. When the device has
reached its minimum operation temperature,
measure the combustion and, if needed,
adjust the minimum rotation speed of the
burning fan to “MIN” with the trim.
a. Turning the trim counter-clockwise will
decrease the rotation speed of the burning
fan, turning it clockwise will increase the
rotation; the adjustment range is approximately
± 5 %.
b. Measure the combustion again.
4. Analyze the O
2
and CO
2
An O
2
analysis reveals more quickly the reason for
impure burning. The O
2
analysis should be performed
with a meter intended for the purpose.
Combustion meters have an oxygen cell, which
measures the O
2
value. The device numerically
changes the value to the CO
2
value, which is used
universally in service shops. There are differences in
calculation formats; a more precise test result can be
achieved using the O
2
value.
A CO
2
value that is too high indicates an excess in
fuel input, not enough combustion air, an air gap in
the burner, or a defective burning fan. A CO
2
value
that is too low indicates that the device is not getting
enough fuel or there is too much combustion air.
See the nominal value in technical information. If the
value differes make the adjustment.
6. In case the basic maintenance does not help
If the device runs unbalanced or becomes sooty
despite the correct fuel and air values, then the
malfunction could be caused by the following:
- sooty burner
- air gap in the burner system
- wrong kind of fuel
- combustion channels are clogged or they have
water in them
If the device has any other fault or acts unusual way,
check the sourse of malfunction from the trouble-
shooting chart 5.0