Webasto Diesel Cooker x100 Service Manual - page 7
Webasto Diesel Cooker X 100
2 Functions description
Fuel pump
The fuel pump is a combined transport, metering
and shut-off system for supplying fuel from the
vehicle’s tank to the cooker.
The adjustment range for the pump’s pulsing is
0.5 sec. - 4.5 sec.; adjustment is linear. Check the
length of the pulsing in the last parameter file.
After turning the operating switch to the ON
position, the pump will be at a standstill for 30
seconds after which the pump’s pulsing will begin
to rise linearly towards the maximum setting; it will
reach the maximum 4 minutes and 50 seconds
after the start-up cycle ends. The power
adjustment will not work during start up cycle.
When you adjust the device from maximum to
minimum, the pump’s impulse interval will
immediately drop, step by step, to the value of the
minimum pulse interval (+ 0.5 sec.). After this, the
pulse will excellerate until it reaches the normal
pulse interval at the minimum output. In other
words, if the pulse interval at the maximum is 1
second and at the minimum 3 seconds, then the
pulse interval will decrease immediately to 3.5
seconds when adjusting from maximum to
minimum. It will rise from that point in 20 seconds
to 3 seconds.
Glow plug
During the first second of ignition the glow plug
receives quick pulses, with which you can make
sure it is working properly. During the 2
nd
second,
voltage
increases
with a pulse ratio of 25 %. After 5
seconds, the pulse ratio
increases
to 70 %; and
after 15 seconds, the voltage
increases
to 100 %.
Programmed ignition monitoring will begin 15
seconds after start-up
,
before which there is only
mechanical protection.
Combustion air fan
The voltage range of the burning fan may be altered
between 4.8 V and 10.7 V by changing the param-
eters; the adjustment range of the parameters is
4,000 mV – 11,000 mV. Check the voltage in the last
parameter file. During the first second of start-up the
control unit tests the fan’s motor. During the follow-
ing second, the motor receives an initial impulse of 7
V from which the voltage is decreased to the mini-
mum set forth in the parameters. The voltage will be
increased linearly towards the maximum during the
start-up cycle; the maximum will be reached in
approximately 4 minutes and 50 seconds after the
start-up cycle ends. The power control does not
work during this time. After the start-up cycle, the
burning fan adjusts itself from maximum to minimum
and minimum to maximum at a rate of 5 % per
second (20 sec. max. > min.).
Heat exchanger
The heat generated by the combustion process is
transferred to the air transported by the combustion
air blowers into the heat exchanger. There i
t
gives
off heat to the ceramic glass panel. The exhaust gas
then exits through the exhaust gas tube and is
ducted outside the vehicle through the stainless
steel exhaust tube.
Heat exchanger
VHF
SXOVH
UDWLR
VHF
SXOVH
UD
WLR
V
HFT
XLFNS
XOVHV
V
HF
SX
OVH
UDWLR
The principle of operation of the ignition voltage
203