11/2010 - Art. Nr. 4200 1029 8600A
4
Operation
Operation
Safety function
Principle diagram
1
two-stage pump.
2
Oil pressure regulator, full load
3
Solenoid valve, full load (NO)
4
Pump
5
Oil pressure regulator, partial load
6
Solenoid valve (NC)
7
Nozzle line
8
Baffle plate
9
Flame tube
10
Burner motor
11
Air flap
12
Air flap electric servomotor
Starting the burner
- After heat is requested by the boiler
regulator, the automatic combustion
control unit starts the program
sequence.
- The blower motor starts up, the ignition
switches on.
- Pre-ventilation with air flap open (air
flap is only closed when the burner is
switched off).
- The solenoid valve
6
opens, pressure
set by the partial load regulator
5
.
- Flame formation.
- Ignition switches off.
Burner operation, regulation between
partial load and full load
The burner operates with one nozzle
and at two different fuel oil pressures,
one for partial load and one for full load.
The oil pressures are controlled
independently by two pressure
regulators in the pump.
If an increase in load is requested by the
boiler regulator, the burner switches
from partial load to full load after a delay
of at least 13 seconds.
- Air flap
11
is moved to the full load
position by the servomotor.
- When the air flap position is
adjustable, the solenoid valve
3
closes, the part-load pressure
regulator
5
is deactivated and the full
load pressure regulator
2
takes over
regulation of the pressure.
- The air flap continues to move to the
full load position. The full load is in
operation.
Safety function
A safety shutdown is triggered:
- if a flame signal is detected during pre-
ventilation (unauthorised flame
monitoring),
- if no flame is produced within 5
seconds (safety time) of the burner
being started (fuel inlet authorisation),
- if no flame is produced after an
unsuccessful restart attempt in the
event of flame failure during
operation.
A safety shutdown is indicated by the
malfunction lamp lighting up. Once the
cause of the malfunction has been
rectified, it is possible to unlock the
control unit by pressing the reset button.
