Webasto Air Top Evo 40 Workshop Manual - Function Description
Air Top Evo 40 / Air Top Evo 55
Function Description
302
In addition, the heating mode is briefly interrupted after every
8 hours and then automatically restarted in the same way as
for a control break. This ensures controlled combustion oper-
ation.
3.4
Control mode
In the control mode, the drive motor speed and the fuel
pump quantity are dependent on the heating capacity. The
glow plug is off.
3.5
Control break
After the temperature set on the control element has been
reached the heat output is reduced. The speed of the com-
bustion and heating air fan and the pumping quantity of the
fuel pump are reduced.
If, at minimum heat output, the intake temperature set on
the control element is exceeded, the fuel pump is shut down
and the combustion process ended. To burn off the flame
properly, the drive motor speed falls after 20 seconds to par-
tial load speed and then returns to the initial speed after
20 seconds, after which it falls to the control break speed in
approx. 90 seconds, where it remains for the entire control
break.
The control break speed is 0 if an external room temperature
sensor is used.
If the temperature set on the control element is dropped be-
low the room temperature sensor, the heater starts again.
NOTE
Changes to the setting on the control element are imple-
mented by the control unit and heater after a delay.
3.6
Switching off
When the heater is switched off, the operating display on the
control element goes out. If no fuel has been transported yet
or if the heater is in the control break, the heater is switched
off immediately without a run-on period.
If the fuel transport has been started it is ended when the
heater is switched off. The heater is switched off using the
same method as the transition from control mode to control
break. The heater is then switched off automatically.
NOTE
It is permissible to switch on the heater again during the run-
on. In this case the run-on is completed and the heater is then
restarted.
3.7
Functions of Air Top Evo System
3.7.1 System design
The Air Top Evo 40 D and Air Top Evo 55 D heaters (diesel)
can be designed as a system with 2 heaters.
Here Unit 1 is defined as the master heater and Unit 2 as the
slave heater. The control element and an external room tem-
perature sensor (T) are connected to the master heater (see
wiring diagram in Figure Fig. 706). The slave heater is con-
nected as shown in the wiring diagram (see Fig. 707) . The
units communicate with each other via a serial bus system.
IMPORTANT
The use of an Air Top Evo system is not permitted for danger-
ous goods transports (ADRs)!
3.7.2 Installation/Commissioning
Installation
1. Installation of the heaters in accordance with Air Top Evo
40 / Air Top Evo 55 installation instructions
2. Ensure that the electrical connections are in accordance
with the wiring diagram (Fig. 706, Fig. 707)
3. Installation of control element and external room temper-
ature sensor
NOTE
When the heaters are switched on, the system automatically
configures itself as master and slave.
3.7.3 Resetting Master/Slave System
In case of a power failure, the system will be reset to the orig-
inal state (“Stand Alone”).
It is also possible to reset the system with the Webasto Ther-
mo Test PC Diagnosis (from Version 2.13).
3.8
Heater functions when installed in ADR
vehicles
NOTE
Only applies to Air Top Evo 40 / Air Top Evo 55 heaters in-
stalled in vehicles for transporting dangerous goods (ADR).
If the heater is switched off using the control element the
slow down time remains unchanged.
A brief slow down time (max. 40 seconds) is started automat-
ically if
•
the vehicle’s engine is switched off
•
a transport device is started.
The ADR switch-off can also be triggered by vehicle-specific
safety mechanisms.
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