Webasto Thermo 90 Workshop Manual

Thermo 90 3 Functional Description
301
3 Functional Description
(Fig. 301)
3.1 Switch-on
When operating the push button "Immediate Heating",
the "Operating Indicator" on the
timer illuminates
or
by activation with the switch, the operating indicator
integrated in the
switch illuminates.
Circulation pump, glow plug, and combustion air fan are
pu
t into operation.
3.2 Heating Operation
After approx. 50 seconds, combustion commences with
the automatically controlled heating operation in full load
for a maximum of 2 hours.
The vehicle's own heating blower s
tarts to operate only
after the heat carrier (coolant) has accumulated enough
heat. After reaching the pre-coded rated temperature
(see table Control Temperatures) heating performance
precision
control will take over in stages down to the
lowest part load operation.
3.3 Control Operation
If the coolant temperature rises up to the control idle
threshold, the heater enters the control idle phase.
The circulation pump, the vehicle's own blower, and the
op
erating indicator remain in operation during the control
idle period.
After the coolant has cooled down to the precoded
r
eactivation temperature, the heater resumes operation.
Diesel Operated Water heaters
If the water heater'
s water temperature is above the
rated temperature but has not yet reached the threshold
for
control idle with the temperature dropping within
10 minutes back to rated temperature (after reaching it for
the
first time), the water heater reverts to the 9.1 kW
heating stage. Should the rated temperature be obtained
after 10 minutes, there will be an automatic reactivation
only up to heating stage 7.6 kW.
Fuel Operated Water Heaters
The maximum heating performance of fuel operated
water
heaters is always 7.6 kW.

Webasto Thermo 90 Specifications

General

Brand	Webasto
Model	Thermo 90
Category	Water Heater
Language	English