BRULA NEO operating instructions
9. Closed-loop control characteristics
This chapter explains a few of the closed-loop algorithms that govern
operation of the control system.
In the event of failure of the flue gas sensor, the throttle valve moves
automatically into a safe position (approx. 70 - 80%). The fire area
can continue to be operated manually.
On cold starts (exhaust temperature below 50°C), the first burnup
always takes place during the "powerful burnup" stage. During this
time, the big flame symbol is NOT displayed. With the ensuing
burnup, the system then switches to the preselected stage.
The acoustic signal to add more fuel only sounds once, when the
time to add more fuel is reached for the first time. After that, this
signal is not repeated.
In Manual mode, there is no progress bar, and no selectable heating
capacity. Whenever the door is opened, the throttle valve moves to
100%, stays there for a while and then returns to its manually set
position after the door has been closed. We urgently recommend
that you only operate the fireplace in Automatic mode.
If wood is not added at the time for adding more fuel, the glowing
phase process commences a short while later. The throttle valve is
not fully closed until the flue gas temperature has dropped below
50°C and the control system has dropped back into Standby mode.
Up until that point, the throttle valve is never fully closed.
Regardless of the flue gas temperature, whenever the door is
opened, the throttle valve first moves to its 100% position. After a
stabilisation time, it then moves to a position that suits the prevailing
flue gas temperature, as defined in the parameter settings.
Following a cold start, if a temperature of at least 50°C is not reached
within 10 minutes of the door being opened, the throttle valve is
closed and the control system reports "No ignition".
Whenever the fireplace insert threatens to overheat, this is
displayed and the throttle valve is restricted in order to reduce
the temperature. Once the temperature has dropped far
enough, the burnup is then continued with the declining closed-
loop control curve. During the next burnup, add less wood.
At the start of combustion, the BRULA NEO MUST be activated by
pressing the screen so that the throttle valve opens.
