Thermo Pro 90
3 Functional description
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OFF state will be assumed if the conditions a) or c) are met
when activating residual heat utilization or during residual
heat utilization.
The heater will be started automatically if the condition b) is
met when activating residual heat utilization or during resi-
dual heat utilization.
3.2
Start and control mode
Automatically controlled heater operation begins when com-
bustion is initiated (start).
The boost heating capacity of 9.1 kW can be actuated for
max. 2 hours at low coolant temperatures.
The heating capacity is modulated between 1.8 kW and
7.6 kW at higher coolant temperatures. The aim is to reach
and maintain the control temperature.
The vehicle's heater fan cuts in when the coolant reaches a
temperature of approx. 30 °C.
The heater is switched to control pause mode if the coolant
temperature continues to increase beyond the control tem-
perature setpoint up to the pause threshold. The coolant
pump, the vehicle's heater fan and the operation indicator
remain in operation during the control pause phase.
The heater starts up again automatically after the coolant has
cooled down to the precoded cut-in temperature.
3.3
Switching off
The operation indicator lamp goes out when the heater is
switched off. The fuel pump stops, combustion stops and
afterrunning begins. The coolant pump, glow plug and the
combustion air fan continue to run during the afterrunning
phase in order to cool down the heater. It is possible to switch
the heater back on during the afterrunning period. The heater
restarts after the afterrunning period has elapsed.
3.4
Heater functions in ADR vehicles
The Thermo Pro 90 heater is switched on and off manually by
means of a switch. Automatic controllers are prohibited. In
vehicles of the type FL, the operation of these heaters is pro-
hibited during loading and unloading and at the loading
points. The generator signal and auxiliary drive signal are
requested for this purpose.
In vehicles of type FL, the heaters are automatically switched
off and the maximum ADR afterrunning time is 40 s in accor-
dance with the legal specifications.
An ADR afterrunning period takes place if:
•
the generator signal (D+) is discontinued or
•
the auxiliary drive signal (e.g. pumping device) is present.
After the end of the ADR afterrunning period, the control unit
is in ADR locking mode.
Before the restarting, the ON/OFF switch must be set to "OFF"
and the auxiliary drive signal must no longer be applied.
The disconnector (emergency off switch) may only be actu-
ated in the event of danger since the heater will be switched
off without any afterrunning period (possible overheating).
