Webasto Air Top Evo 3900 Operating Instructions Manual - Note:
Control element
Set the rotary knob on the control element to the desired temperature.
Note:
To prevent the hot and combustion air fan from blocking or scraping, ensure that
there are no objects on or against the heater before you switch it on.
NOTE for ADR mode only:
The Air Top Evo 3900 ST and Air Top Evo 5500 heater units are switched on and
off manually using a switch. The use of automatic control systems is prohibited.
In class FL vehicles these heaters must not be used during loading and unloading
procedures or at loading points.
In class FL vehicles the heaters are switched off automatically and the
combustion air supply is interrupted for a maximum of 40 seconds if:
-The vehicle's engine is at a standstill; in this case the heater can be switched on
again by hand.
-A pumping device that is part of the vehicle is started.
The control unit is then in fault lock-out mode. The ON/OFF switch must be set to
OFF before the heater can be restarted.
Rotary knob for:
- Switching on and off
- Setting the room temperature
- Resetting after a fault cut-out
Indicator/error code display
Switch on
Changes to the settings
on the control element
will be carried out with a time
delay