Page 1
Operation
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be operated with the fuel specified on the namplate.
In the case of a severe build-up of smoke, unusual
combustion noises or fuel smell, the heater is to be put out
of operation by removing the fuse and may only be
restarted after it was inspected by Webasto-trained
personnel.
be operated at least once a month for 10 minutes, with the
vehicle engine cold and at the lowest fan setting. The
heater should be checked annually by a qualified expert,
preferably prior to the heating season commencing.
nnWebasto will not assume any liability if the installation
instructions and the notes contained therein are not
observed. The same applies to improperly performed
repairs or those where others than genuine replacement
parts have been used. In those cases, the heater's General
Design Certification and thus the General Operating Permit
(homologation) will be invalidated as a consequence.
Claims can only be asserted if the claimant can prove that
the maintenance and safety notes were adhered to.
The heater :must
Liability claims:
G
Before switching the heater on, set the vehicle heating system to the "warm" position
and the vehicle heater fan to the lowest setting (less power consumption)!
Applicable to Thermo 90 / 90 S -ADR only: The heater is switched on by means of the
switch. AADR situation (forced shut-down) is initiated when
- the vehicle engine is switched off
- a pumping device is put into operation,
in which case the short after-run period is terminated after 20 seconds.
Thereafter, the electronic control unit is in the "fault lock-out" state. Before the heater can
be restarted, the On/Off switch must be set to "Off".
The disconnect switch (Emergency Stop switch) may only be actuated in an emergency
situation since this will shut the heater down without any after-run being performed
(danger of overheating).
Ident-Nr. 1300309A 3/0011
Operating Instructions
General Information
Maintenance and Safety Information
Dear Webasto Customer !
We assume that the workshop / service center that carried out the installion explained to
you the operation and principle of functioning of your new heater to your complete
satisfaction. With these operating instructions we would like to provide you with an
overview of the use of the Thermo 90 / 90 S.
Within the scope of the StVZO (Road Traffic LicensingAct) "General Design Approvals"
laid down by the Federal Office for Motor Traffic exist for the Thermo 90 / 90 S water
heaters.
The installation of the units must be carried out in accordance with the enclosed
installation instructions. The installation must be checked in accordance with the Legal
Provisions for Installation. For details refer to the installation instructions.
The year of the initial operation must be durably marked on the heater's nameplate by
removing the non-applicable years.
When installing the Thermo 90 / 90 S D heater in vehicles for the transport of hazardous
materials, the requirements laid down in ADR 002 and ADR 003 (Technical Guidelines
relating to the ordinance of transporting hazardous materials on the road) must be
fulfilled in addition to those of the StVZO.
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at filling stations and tank farms.
in locations where flammable vapours or dust may
accumulate (e.g. in the vicinity of fuel-, coal-, sawdust or
grain depots).
in enclosed spaces (e.g. garages). This should also be
considered when pre-setting heater operating times or
using the Telestart remote control.
nnexposed to temperatures greater than 120°C (storage
temperature). Exposure to such temperatures may cause
damage to the electronic components.
operated without a minimum level of 20% of good quality
antifreeze in the water of the heating circuit.
The heater must be switched :off
Danger of explosions
and asphyxiation
The heater must benot
D
!
Webasto Thermosysteme International GmbH
Postfach 80 - D-82132 Stockdorf - Hotline (01805) 93 22 78
Hotfax (0395) 55 92-353 - http://www.webasto.de
Water Heater
Thermo 90 / 90 S
Page 2
Standard Timer
Switching the
heater on
General
Switching the
heater off
Operation
Setting time/
day of the
week
Viewing
the time
Programming
heater starting
time
Recalling/
erasing preset
times
Programming
duration of
operating time
Setting the
remaining
operating time
Setting the
wakeup time
Recalling/
erasing the
wakeup time
Remote control
Manually: by pressing the button (continuous heating mode)
Automatically: by programming the heater starting time
The standard digital timer enables you to preset the start of the
heater operation up to 7 days in advance.
It is possible to program 3 different starting times, only one of which
can be activated.
The standard digital timer features a wakeup alarm function.
When the ignition switched on, the timer displays the current time
and the day of the week. When the heater is switched on, the display
and the buttons are illuminated.
After the power supply has been connected, all symbols on the
display will flash. The current time and weekday must be set.
The timer can be operated in that all flashing symbols can be
adjusted by means of the and buttons. If the buttons are not
pressed within 5 seconds, the time displayed will be stored. If the
and buttons are pressed for more than 2 seconds, the fast timesetting mode is activated.
If the ignition is switched off while the heater is operating in the
continuous mode, the remaining operating time of 15 minutes is
displayed and the heater continues to operate for this period of time.
Manually: by pressing the button
Automatically: after the programmed operating time has elapsed
With the heaterrunning: by programming the remainingoperating time
Press the button for more than 2 seconds - time of the day is
flashing - and set the clock using the and buttons. Day of the
week is flashing - adjust the day of the week.
With the ignition switched off: press the button
Press the button - the memory location is flashing - using the
and buttons set start of the heater operating time. Day of the week
is flashing - set the day of the week. By repeatedly pressing the
button, memory locations 2 and 3 can be programmed or the time
display mode can be reached.
Repeatedly press the button until the desired memory location is
displayed. To erase the preset time, press the button several
times until the time of the day is displayed instead of the memory
The heater must be switched off. Press the button for 3 seconds operating time is flashing - and set the desired operating time (10 to
120 minutes) using the and buttons.
Set the desired remaining operating time (1 to 120 minutes) using the
and buttons. The remaining operating time refers to the time the
heater still continues to remain in operation. It can only be changed
while the heater is in operation and the ignition switched off.
A wakeup time can only be programmed on the standard digital timer.
The wakeup time is not bound to a specific day of the week.
Repeatedly press the button until the bell symbol appears on
the display. Set the desired wakeup time using the and
buttons.The alarm clock turns off after 5 minutes or when one of the
buttons is pressed.
Repeatedly press the button until the bell symbol appears on
the display - read off wakeup time. To erase the wakeup time: press
the button until the bell symbol is no longer visible on the
display.
Possible by means of an optional external "instant heating" button
day of the week heater "on" indicator
forward
Standard Timer
instant
heating
reverse
program
selection
time
alarm indicator
memory location
time display
2
MO
Vehicles
with ADR
equipment
On ADR vehicles it is not possible to program a preset starting time.
The remaining time is shown on the display while the heater is in
operation. The clock can be set. The alarm clock function can be
programmed on the standard digital timer.
Page 3
Fault Code Display
Fault Codes on the Display of the Combination or Standard Digital Timer
NOTE:
!
No start-up (after 2 start-up attempts)
Flame extinguished (at least > 5)
Undervoltage or overvoltage
Premature flame detection
Flame detector interruption or flame
detector short-circuit
Temperature sensor interruption or
temperature sensor short-circuit
Metering pump interruption or metering
pump short-circuit
Fan motor interruption or
fan motor short-circuit or
incorrect fan motor speed
Pencil-type glow plug interruption or
pencil-type glow plug short-circuit
Overheating
Circulating pump interruption or
circulation pump short circuit
F01
F02
F03
F04
F05
F06
F07
F08
F09
F10
F11
After the occurrence of a malfunction, the fault is indicated on the display of the digital
timer if the heater is equipped with a standard digital timer.
If the heater is activated by the switch, the types of malfunctions are indicated by
coded flashing signals via the operation indicator light during the after-run period of
the heater. The coded flashing signals correspond to the numbers in the table below
Heater turns itself off automatically (=fault lock-out)
Cause Remedy
Troubleshooting
In the event of a malfunction, fuses and electrical connections should be checked for
proper condition and security.
If this action does not correct the defect, consult your authorized Webasto dealer.
After the heater has been shut down due to a fault lock-out, a coded flashing signal is
emitted through the operation indicator during the after-run cycle of the heater. These
coded flashing signals are designed to assist the authorized Webaste dealer in isolating
the fault.
Combustion was not established
during start-up and start-up repetition
Shutdown initiated by
temperature limiter (overheating)
Switch heater off and then on again.
If the heater fails to re-start consult your
authorized Webasto dealer
Heater overheats due to
lack/loss of coolant
Top up coolant in accordance with the
vehicle manufacturer's instructions
Voltage drop for more
than 20 seconds
Check fuses, electrical connections and
battery
Pushbutton of the temperature limiter must be
pushed in prior to restarting the heater.
Flame goes out during operation
Subject to change
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