3 Description of Operation Thermo Pro 90
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If the criterion b) is met during the activation of the residual-
heat utilisation phase or during the residual-heat utilisation
phase, then the heater is automatically started.
3.2 Starting and control mode
After combustion begins (start), controlled heating
automatically begins.
At a low coolant temperature, the boost heating capacity of
9.1 kW can be run for a maximum of 2 hours.
At a higher coolant temperature, the heating capacity is
modulated between 1.8 kW and 7.6 kW. The objective to
achieve and maintain the control temperature.
The original vehicle heater fan does not switch until the
coolant is sufficiently heated (from approx. 30 °C).
If the coolant temperature increases above the set-point
value of the control temperature, and further to the control
break threshold, the heater switches into the control break.
The circulation pump, the original vehicle heater fan and the
operation indicator continue to operate during the control
break.
The heater starts again automatically after the coolant has
cooled to the pre-encoded restart temperature.
3.3 Switch off
When the heater is switched off, the operation indicator on
the standard timer/switch goes out. Combustion is ended
and the run-on begins. However, the circulation pump, the
glow plug and the combustion air fan continue to run
during the run-on time to cool the heater. It is permissible
to switch on the heater again during the run-on. However,
restarting does not take place until after the run-on is
complete.
3.4 Functions of heater in ADR vehicles
The heater is put into operation with the switch. An ADR
case (forced switch-off) is triggered if
– the vehicle engine is shut down
(generator signal (D+) is eliminated),
– a pumping device is put into operation (auxiliary drive
signal (NA) is active).
In this case, combustion is ended and a reduced run-on, i.e.
the ADR run-on, is initiated. 40 seconds after the ADR case
occurs, the ADR run-on is ended.
Then the heater is in the "ADR lock-out" state. Before
restarting, the On/Off switch must be set to "Off" and the
auxiliary drive signal may no longer be active.
The isolating switch (Emergency-Stop switch) may only be
operated in case of danger, as the heater is switched off
without any run-on (overheating possible).
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