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Commissioning
Fuel-oil start-up mode
Fuel-oil operating mode
General safety functions
Fuel-oil start-up mode
If heat is required by the furnace, the
electronic combustion manager
receives an operation request.
When the automatic firing device
program has come to its end, the burner
will be turned on.
The air flap is closed when the burner
is out of operation.
The automatic firing device controls and
monitors start-up. The burner fan starts
up and the electrical servomotor opens
the air flap to the full load position so the
furnace and the exhaust hoods are
ventilated at the specified air rate.
Shortly after the preventilation process
has been started the safety device used
to detect an absence of air is switched to
the operating position within a certain
time, i.e. the minimum air pressure
setting must be reached and maintained
until the burner is turned off. After the
expiry of the preset preventilation time,
the air flap is set to partial-load position.
Pre-ignition takes place and the fuel-oil
is then released.
General safety functions
In case a flame does not develop when
starting the burner (fuel release), the
burner controller will shut off at the end
of the safety period (fault lock-out). A
lockout will also occur in the case of
flame failure during operation, air flow
failure during the pre-ventilation phase
and pressure failure during the whole
period of burner operation. Any failure of
the flame signal at the end of the safety
period and a flame signal during the
preventilation phase (external light
control) will result in a lockout with the
automatic firing device being locked.
The fault is indicated by the fault signal
lamp lighting up. The automatic firing
device can be unlocked immediately
after a lockout by pressing the unlocking
key.
The automatic firing device will return to
its starting position and proceed with the
restart of the burner. If there is a power
failure, the control system is shut down.
After voltage recovery, the burner can
be automatically restarted unless
another interlock is active, e.g. one
caused by the safety circuit. In any case,
the fuel-oil supply will be immediately
stopped upon occurrence of a fault.
The solenoid valves open and release
the oil, which is under pressure, to the
nozzle and return. The fuel-oil is
nebulised, mixed with the combustion air
and ignited. A normal, steady flame
must be formed within the safety time.
When the safety time elapses, a flame
signal must be sent to the automatic
firing device via the flame monitor and
must remain in place until the control
system is switched off. The start-up
programme for the burner is completed.
Fuel-oil operating mode
After the flame has developed, the
output control will be enabled. This
brings the burner to its operating
position. The output controller will now
automatically control the burner
between its partial-load and full-load
positions.
Depending on the heat demand, the
electric servomotor will be fed with the
open or close command via the
regulator and thus increase or decrease
the gas and air flow rates.
This compound control system will vary
the positions of the oil control valve and
air valve, and thus regulate the oil flow
rate in combination with the air flow rate.
The stepless control makes it possible to
operate the burner at any desired stage
between its partial-load and full-load
positions. The burner is shut down from
the partial load position. The air flap will
When using the burner control system
(electronic compound control) all
operational and fault messages may be
indicated in plain text on an optionally
available operating and
display module.
03/2016 - Art. Nr. 4200 1044 8002A
be closed when the burner is in its off
position so as to prevent cold air from
flowing through the burner, heat
generator and chimney. The interior
cooling losses will be greatly minimised.
Warning: If gate valves have been
installed in the exhaust gas tract, they
must be fully opened during the start-up
phase, otherwise there is a risk of a low-
speed detonation or an explosion! The
open-position of the shut-off damper can
be assured by the integration of the
opening contact of the shut-off damper
in the safety chain of the heat generator.
Important:
No object which is capable of being
sucked up (for example, cloths,
instructions) must be left within 0.5m of
the burner air extraction intake. If these
objects are sucked into the burner, it
may lead to malfunctions and dangerous
operating states. This may result in a
switch to malfunction mode or damage
to the environment and to the
installation, and may even cause injury.
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