Webasto Thermo 90 Workshop Manual

Thermo 90 3 Functional Description
303
G Vehicle Blower
Setting of Control Temperatures Thermo 90
On the standard wiring harness B6 is not in use.
NOTE
The selected control idle temperature of the heater
should be below the opening temperature of the cooler
the
rmostat!
Setting of Control Temperatures Thermo 90 S
Connection of signal "motor on"/ "m
otor off" (terminal D+)
to the control unit (connector X12, contact 7) will enable
different thereshold values.
If the signal terminal D+ is not conn
ected, temperatures
will be those linke for "motor off".
NOTE
The selected control idle temperature of the heater
should be below the opening temperature of the cooler
the
rmostat!
3.6 Malfunctions
3.6.1 Switch-off upon Failure
In case of a no-flame condition fuel is delivered for a
max. of 180 seconds.
In the event of a flame-out during operation fuel is
de
livered for a max. of 90 seconds.
Should an overheat condition exist
(after response of the
temperature limiter), no fuel will be delivered.
After switch-off by low voltage protection
for more than 20 seconds there
will be no fuel supply.
After removal of the fault there will be an
error lock-out.
Reset by switch-off and reactivation of the heater.
In case of overheating, the knob of the temperature limiter
ha
s to be reset after the unit has cooled down.
CAUTION
To avoid damage to the component, do not attempt to
re
set the temperature limiter by force while hot.
3.6.2 Diagnosis after Switch-off upon Failure
(Thermo 90)
When operated with switch or triple timer the type of error
lock-out condition is indicated by an operation indicator
light flash code while the heater is in run-down.
After five short signals the following long flash pulses are
coun
ted:
1x No start (after 2 start attempts)
2x Flame-out during operation (repeated > 5)
3x Voltage too low
4x Premature flame detection
5x Flame sensor open or short circuit
6x Temperature sensor open or short circuit
7x Dosing pump open or short circuit
8x Fan motor open or short circuit or wrong speed of
fan motor
9x Glow plug open or short circuit
Table
Rated Temp.
at Sensor
Control
Idle
Reactivation
af
ter
Control Idle
Minus to B6
B6 not used
Plus to B6
80° C
72° C
65° C
90° C
82° C
75° C
75° C
67° C
60° C
Table
Rated Temp.
at Se
nsor
Control
Idle
Reactivation
af
ter
Control Idle
"Motor on"
"Motor off"
72° C
80° C
82° C
90° C
67° C
75° C
Thermo 90 Thermo 90 S
12 Volt 10.5 V ± 0.5 V 10.5 V – 0.5 V
24 Volt 21 V ± 1 V 21 V – 1 V

Webasto Thermo 90 Specifications

General

Brand	Webasto
Model	Thermo 90
Category	Water Heater
Language	English