Eberspächer AIRTRONIC D2 Operating Instructions And Service Book - Function
Page 17
Airtronic D2 / D4 / D4+
Function
Switching On
The pilot lamp in the operating control lights up
when the heater is switched on.
The glow pin is switched on and the fan will
start running at a low speed.
Please Note:
If there is any residual heat within the heat
exchanger from a previous heating operation,
the fan only (cold blowing) will run until the
residual heat has been dissipated.
Start
Airtronic D2
Fuel starts to be delivered after approx.
60 seconds.
The fuel-air mixture in the combustion
chamber ignites. Once the combi-sensor
(flame sensor) has detected the flame, the
glow pin is switched off after 60 seconds.
After another 120 seconds the Airtronic has
reached the control stage POWER (maximum
fuel quantity and maximum fan speed).
Airtronic D4 / D4+
Fuel starts to be delivered after approx.
60 seconds.
The fuel-air mixture in the combustion
chamber ignites. Once the combi-sensor
(flame sensor) has detected the flame, the
glow pin is switched off after 80 seconds.
The Airtronic is in the control mode.
Method of Operation Airtronic D2 / D4 / D4+
Temperature Selection with the
Operating Controls
The desired temperature is pre-selected with
the operating controls. Depending on the
temperature selected, on the size of the room
to be heated, and on the prevailing outdoor
temperature. This value may range between
+10 °C and +30 °C. The control switch setting
to be selected is an experimental value.
Control in Heating Mode
In heating mode the room temperature and the
temperature of the heating air is continuously
measured.
Control commences if the temperature
exceeds the temperature pre-selected on the
control element.
4 control levels have been provided so
that the heat flow supplied by the heater
can be accurately adapted to the heating
requirements. Each control setting has its own
fan speed and fuel quantity. If the adjusted
temperature is ever exceeded at the lowest
control level then the Airtronic is adjusted to
the ‘OFF’ control level and the fan will continue
to run for approx. 240 seconds to allow the
heater to cool down.
Afterwards the fan will continue to run at the
slowest speed (re-circulation mode) or will be
switched off (fresh air mode) until a renewed
start of the heater.