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
put 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 starts 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
operating indicator remain in operation during the control
idle period.
After the coolant has cooled down to the precoded
reactivation 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.
Summary of Contents for Thermo 90
Page 9: ...1 Introduction 104 Page free for notes ...
Page 13: ...2 General Description Thermo 90 204 Page free for notes ...
Page 18: ...Thermo 90 3 Functional Description 305 Page free for notes ...
Page 20: ...4 Technical Data Thermo 90 402 Page free for notes ...
Page 26: ...6 Functional Tests Thermo 90 602 Page free for notes ...
Page 41: ...Thermo 90 8 Servicing 809 Page free for notes ...
Page 53: ...10 Packaging Storage and Shipping Thermo 90 1002 Page free for notes ...