6
Operation
Start-up Mode
Oil Operating Mode
General Safety Functions
Start-up mode
As soon as the furnace system is requi-
red to supply heat the burner control cir-
cuit will close and the program be
started. After the program has run down
the burner will start.
The air damper is closed when the
burner is out of operation.
The automatic furnace controller con-
trols and monitors the starting function.
The electric actuator opens the closed
air damper to its full-load position so
that the burner will sweep the furnace
compartment and exhaust ports at the
required air flow rates. Shortly after the
pre-ventilation process has been star-
ted the lack-of-air cut-out must change
over to operating position within a cer-
tain time, i.e. the minimum air pressure
setting must be reached and maintained
until the burner is turned off. At the end
of the specified pre-ventilation time the
air damper will be moved into its partial-
load position. This operation will be fol-
lowed by the pre-ignition procedure and
the oil feed start.
The solenoid valves will open and thus
allow the pressurized oil to flow to the
nozzle and to the return line. The oil will
be atomized, mixed with the combustion
air and ignited.
A safety period is provided to allow the
flame to develop a proper and steady
pattern. On the termination of the safety
period, a flame signal must have been
received by the automatic furnace con-
troller via the flame monitor and remain
on until the regular shut-off. The start-
up program of the burner has now been
completed.
Oil operating mode
After flame formation, the burner will
shortly remain in the separately set igni-
tion load, and is then run to minimum
output. Then the oil feed will start for
load regulation. The load regulator will
now control the burner automatically
between its partial-load and full-load
stages.
Depending on the heat rate required the
servomotor will via the controller be
given an "open" or "close" signal and
thus increase or decrease the oil and air
flow rates.
This compound control concept will vary
the position of the oil control valve and
air damper and thus adjust the oil flow
rate in relation to the air flow rate.
The stepless control will allow the bur-
ner to be operated at any desired stage
between its partial-load and full-load
positions. The air damper will be closed
when the burner is out of operation and
will thus prevent cold air flowing through
the burner chamber, heat exchanger
and chimney. The interior cooling los-
ses will be greatly minimized.
General safety functions
In case a flame does not develop when
starting the burner (fuel release) the bur-
ner will shut off at the end of the safety
period (shut-off on trouble). A shut-off on
trouble will also occur in the case of flame
failure during operation, air flow failure
during the pre-ventilation phase and pres-
sure failure during the whole period of bur-
ner operation. Any failure of the flame
signal at the end of the safety period and a
flame signal during the pre-ventilation
phase (external light control) will result in
a shut-off on trouble with the automatic
furnace controller being lokked. Die Stö-
rung wird am Display der elektronischen
Regelung und/oder wenn vorhanden
einer Störmeldelampe angezeigt.The
trouble is indicated by the trouble signal
lamp lighting up. The automatic furnace
controller can be unlocked immediately
after a shut-off on trouble by pressing the
unlocking key. The program unit will return
to its starting position and proceed with
the restart of the burner.
A voltage failure will result in a regular
shut-off of the burner. Upon voltage reco-
very there may be an automatic restart
unless another interlock is provided, e.g.
by the safety system. In any case of
trouble the fuel oil supply will be shut off
right away. The program unit will stop at
the same time causing also the trouble
location indicator to stop. The symbols will
indicate the kind of trouble.
When using the burner control system
type BCS all operational and fault messa-
ges may be indicated in plain text on an
optionally available operating and display
module.
When using the Etamatik/VMS/FMS
system, the display is located directly on
the control system, which is incorporated
in the boiler switch cabinet. In the Etama-
tik OEM, the control system is located in
the electric module of the burner, and the
customer interface is also located on this
module or incorporated in the boiler switch
cabinet. In the Etamatik OEM, a pro-
gramming unit could be installed as an
alternative to the customer interface.
sregulierung
