Manual

30
Description of functions
Switching on
When the heater is switched on, the control lamp in
the control element lights up.
The glow plug is switched on and the fan starts at
low speed.
If there is still too much residual heat in the heat
exchanger from when the heater was last used, firstly
only the fan starts up (cold blowing).
Once the residual heat has been cleared, the heater
starts.
Starting AIRTRONIC
After approx. 60 seconds the fuel supply starts and
the fuel/air mixture in the combustion chamber ignites.
Once the combined sensor (flame sensor) has
detected the flame, the glow plug is switched off after
60 seconds.
After another 120 seconds, the heater has reached
the “POWER” stage (maximum fuel quantity, maximum
fan speed).
Starting AIRTRONIC M
After approx. 60 seconds the fuel supply starts and
the fuel/air mixture in the combustion chamber ignites.
Once the combined sensor (flame sensor) has
detected the flame, the glow plug is switched off after
approx. 80 seconds, the heater is in the normal mode.
Temperature selection with the control element
Select the required passenger compartment
temperature with the knob. The temperature setting
can be between +10 °C and +30 °C depending on the
size of the room being heated and the prevailing
outside temperature. The required setting of the knob
is an empirical value.
Operation and function
4
Please note!
Control in the heating mode
During the heating mode, the room temperature or the
temperature of the sucked in heating air is constantly
measured.
If the temperature is higher than the temperature
selected on the control element, the heater starts to
regulate its output. There are 4 control stages so that
the outflow of heat produced by the heater can be
adjusted finely to the heating requirements. Fan speed
and fuel quantity correspond to the particular control
stage.
If the set temperature is still exceeded in the smallest
control stage, the heater goes to the “OFF” stage with
the fan running on for approx. 4 minutes to cool off.
Then the fan continues at minimum speed (circulation
mode) or is switched off (fresh air mode) until the
heater is started again.
Ventilating mode
In the ventilating mode, first the changeover switch
“heating/venting” has to be activated and then the
heater is switched on.
Switching off
When the heater is switched off, the control lamp
goes off and the fuel supply is switched off.
The fan runs on for approx. 4 minutes to cool down.
While the fan is running on, the glow plug is switched
on for approx. 40 seconds to clean.
Special case:
If no fuel has been supplied or if the heater is in the
“OFF” stage until it is switched off, the heater is
stopped without any after running.