Webasto Thermo 90 ST User manual

Dear Webasto Customer,
We presume that the principle and mode of operation of your new heater has been explained
to your complete satisfaction by the workshop/service centre which installed the heater. In
these operating instructions we would like to once again provide you with an overview of the
safe use of the heaters.
Within the territory governed by European Directive 70/156/EEC and/or EC/2007/46 (for new
vehicle types from 29/04/2009), there are homologation approvals for the Thermo 90 S water
heaters in accordance with the directives 2001/56/EC (Heating systems) and 72/245/EEC
(EMC) and for the Thermo 90 ST water heaters in accordance with ECE-R 122 (Heatings) and
ECE-R 10 (EMC).
The units must be installed in accordance with the enclosed installation instructions. The in-
stallation must be checked in accordance with statutory installation provisions. Refer to the
installation instructions for more details.
The year in which the heater was used for the first time must be permanently displayed on
the type label by deleting the inapplicable years from the label.
When installing the Thermo 90 S / Thermo 90 ST heater in vehicles for transporting dangerous
goods, the requirements of the ADR in the respectively valid version must also be complied
with in addition to the German Road Traffic Regulations (StVZO).
The heater must not be operated :
• In filling stations and tank farms.
• At locations at which highly flammable gases or dusts can
form, and at locations at which highly flammable liquids
or solid materials are stored (e.g. near fuel, coal and wood
dust, grain warehouses, dry grass and leaves, cardboard ,
paper, etc.)
• In enclosed rooms (e.g. garages), not even via the timer or
Telestart.
The heater must not:
• be exposed to storage temperatures of more than +85 °C.
Otherwise the electronics may suffer permanent damage.
• Be operated without at least 20 % brand name anti-
freeze in the water of the heating circuit.
General Information
Maintenance and Safety Instructions
Danger of explosion
and suffocation!
Operating Instructions
Thermo 90 S
Thermo 90 ST

Before switching on the heater, the vehicle heater must be set to "hot", and the vehicle heat-
er fan must be set to the slowest speed (reduced current consumption)!
For ADR vehicles only:
The Thermo 90 S / Thermo 90 ST heaters are switched on and of manually with a switch. The
use of automatic control systems is prohibited. In class FL vehicles these heaters must not be
used during loading and unloading procedures or at the loading points.
In FL type vehicles the
heaters are switched off automatically and the supply of combustion air is stopped after a
maximum of 40 seconds in the following circumstances:
– The vehicle engine is at a standstill; in this case the heater may be switched on again by
hand
– A transport device on the vehicle is started in which case the brief slow-down time is
stopped after 20 seconds (Thermo 90 ST after 40 seconds).
Subsequently, the control unit is in its "fault lock-out" mode. Before the heater can be re-
started, the On/Off switch must be set to "Off".The Emergency-Stop switch may only be op-
erated in case of danger, as the heater is then switched off without run-on (overheating
possible).
The heater:
• may only be operated with the fuel specified on the rating
plate and at the nominal voltage specified on the rating
plate.
• must be taken out of operation by switching it off
immediately and removing the fuse if smoke develops, if
unusual burning noises are heard or if there is a smell of
fuel.
The heater must not be restarted until the unit has been
checked exclusively by personnel duly trained by
Webasto.
• must be put into operation for 10 minutes at least once a
month with the engine cold and the fan set to the
minimum setting.
• must be inspected every year by a specialist at the
beginning of the heating season or earlier.
Liability:
• Non-compliance with the installation instructions and the
warnings contained therein will lead to the exclusion of all
liability by Webasto. The same applies if repairs are carried
out incorrectly or with the use of parts other than genuine
spare parts. This invalidates the type approval for the
heater and its homologation/EC or ECE-type permit.
• Claims can only be made if it can be verified that the
claimant has complied with the servicing and safety
instructions.
Operation of the heater

Standard timer
General information
The standard timer allows the heater start time to be selected for a period of up to seven days.
It is possible to program 3 different starting times, only one of which can be activated.
The standard digital timer features a wake-up alarm function.
When the ignition is switched on the timer shows the current time and the day. 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.
Operation
The timer can be operated in that all flashing symbols can be adjusted by means of the
and buttons. If no button is pressed for five seconds the displayed time is saved. If the
and buttons are pressed for longer than two seconds, they will switch to high speed ad-
justment.
If the ignition is switched off whilst the heater is in immediate heating mode, a remaining
operating time of 15 minutes will appear on the display and the heater will continue to op-
erate.
Switching on
Manually: by pressing the button (immediate heat)
Automatically: By programming the start time.
Switching off
Manually: by pressing the button (immediate heat)
Automatically: by programming the switch-on duration
With running heater: by setting the remaining operating time.
Setting time/day of the week
Press the button for more than two seconds - the time flashes - set the time using the
and buttons - the day flashes - set the day.
Instant
heating
Reverse
Operating indicator
Day of the week
Time display
Memory location
Program selection
Time
Standard timer
with alarm
Forward
Alarm indicator

Viewing time
With ignition switched off: press the button.
Programming heater starting time
Press the button - program number flashes - set the start time using the and but-
tons - the day flashes - set the day.
If you press the button several times, you can set the program numbers 2 and 3 or go to
the time mode.
Viewing/deleting selected times
Press button repeatedly until the desired program number is displayed. To delete the se-
lected time, press the button repeatedly until the time is displayed, with no program
number.
Programming duration of operating time
The heater must be switched off. Press the button for three seconds - the operating du-
ration flashes - set the required operating duration using the and buttons (10 to
120 minutes).
Setting remaining operating time
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 oper-
ation. It can only be changed whilst the heater is operating and the ignition is off.
Setting wake-up time
A wake-up time can only be programmed with the standard timer.
The wake-up time is not bound to a specific day of the week. Press the button repeatedly
until the bell symbol appears in the display. Set the desired wake-up time using the
and buttons.
The timer switches off after 5 minutes or when one of the buttons is pressed.
Viewing/deleting wake-up time
Press the button repeatedly until the bell symbol appears in the display and read off
the wake-up time.
Delete the wake-up time by pressing the button repeatedly until the bell symbol is no
longer visible in the display.
Remote control
Possible using an external optional immediate heat button.
Vehicles with ADR equipment
It is not possible to set a time on ADR vehicles. The remaining time is shown on the display
while the heater is in operation. The time can be adjusted. The alarm clock function can be
programmed on the standard digital timer.

If a fault occurs, check that the fuses and plug connections are in perfect condition and se-
cure.
If this action does not correct the defect, consult your authorised Webasto dealer.
After the heater has been shut down due to a fault lock-out, a coded flashing signal is emit-
ted through the operation indicator during the run-on time of the heater. These coded flash-
ing signals are designed to assist the authorised Webasto dealer in diagnosing the fault.
When equipped with the standard timer, a fault output appears in the display after a fault
occurs.
Cause Remedy
No combustion after
starting and restarting.
Flame goes out during
operation.
Switch off heater and switch on again.
If the heater fails to re-start consult your
authorised Webasto dealer.
Voltage drop for more
than 20 seconds.
Check fuses, electrical connections and
battery.
Heater has overheated due to
lack/loss of coolant.
Top up coolant in accordance with the
vehicle manufacturer's instructions.
Action in the event of faults
Heater switches off automatically (= fault lock-out)
Fault code output

NOTE
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 run-on time of
the heater.
After five short signals, count the long flashes:
The flashing pulses match the number in the table below.
F 00/-- (only five short flashing pulses)
Heater lock-out or control unit defective,
Unlocking only possible by specialised workshop
F 01 No start (after 2 starting attempts)
F 02 Flame failure
F 03 Undervoltage or overvoltage
F 04 Premature flame detection
F 05 Flame monitor interruption or
flame monitor short circuit
F 06 Temperature sensor interruption or
temperature sensor short-circuit
F 07 Metering pump interruption or
metering pump short-circuit
F 08 Fan motor interruption or
fan motor short-circuit or
incorrect fan motor speed
F 09 Glow plug interruption or
glow plug short circuit
F 10 Overheating
F 11 Circulation pump interruption or
circulation pump short circuit
Fault Codes on the Display of the Combination or Standard
Digital Timer
Webasto Thermo & Comfort SE
Postfach 1410
82199 Gilching
Germany
Visitors' address:
Friedrichshafener Str. 9
82205 Gilching
Germany
Internet: www.webasto.com
The telephone number of each country can be found in the
Webasto service center leaflet or the website of the respective
Webasto representative of your country.
Part No. 1301489C • 02/13 • Modifications and errors excepted • Printed in Germany • © Webasto Thermo & Comfort SE, 2013