Eberspächer B3LC User Manual - page 25
25
Operation and function
4
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.
Start
After approx. 15 seconds the fuel supply starts and
the fuel / air mixture in the combustion chamber
ignites.
After the flame has been detected the glow plug is
switched off.
Rapid heating up takes place in the “POWER“ control
stage with maximum heating current until the heat
exchanger has reached its operating temperature.
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.
Control in 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 greater than the temperature
preselected at the control element, the heater
changes the heater to the “LOW“ step and then runs
with a lower fan speed.
If the heat flow in the “LOW“ control step no longer
suffices, the heater switches to the “MEDIUM“ control
step.
The fan continues to run at a low speed.
In most cases the “LOW – MEDIUM – LOW“ control at
a low speed will cover the required heating
requirements.
If the heat flow in the “MEDIUM“ control step is
insufficient, the heater switches back to the “HIGH“
control step.
This in turn requires the full fan speed.
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
down.
Then the fan continues at minimum speed (circulation
mode) or is switched off (fresh air mode) until the
heater is started again.
The restart takes place in the “MEDIUM“ control step
at a low fan speed.
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. 3 minutes to cool down.
While the fan is running on, the glow plug is switched
on for approx. 15 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.
Please note!