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18
DESCRIPTION OF BURNER FUNCTION
Normal start-up
When thermostat gives instruction to burner, ventilator is started and photocell
controls flame. If there is no flame, then comes the instruction for test blow-through of
burner. After-wards, pellets start falling into burner within the period stated by control
system and ignition is activated. When the phase of fuel supply for ignition ends,
control system awaits flame signal from photocell.
When photocell recognizes flame, small amounts of pellets are falling within the
transition period. Duration of this period depends on the output level set on burner.
Pellet supply is be-ing continually increased, unless it is adequate to the required
output.
This amount is further supplied into burner, until the operation thermostat gives
instruction to stop.
This signal stops pellet supply, while ventilator continues with air supply into burner.
When photocell recognizes fuel burn-down, the burner blow-through begins.
According to the adjusted delay, after fuel burn-down, burner cleaning begins – burner
grate moves out against scraper and ash with unburnt pieces fall through front side of
burner bot-tom into ash tray.
After the grate moves back, the burner awaits new signal from thermostat.
ATTENTION! Grate drive unit is very strong and it may cause danger. Never put any
body parts or other foreign objects into burner, when it is operating.
Normal start, when there is still flame in burner
If photocell recognizes flame during the start-up phase (e.g. after short-time power failure),
con-trol system immediately begins transition period. Pellet burner continues in
operation as by normal start. (see above)
.
ATTENTION! Make sure, that sufficient flue gas temperature had been achieved. It
has to be at least 60 °C – one meter under the chimney top. Lower temperature
should be con-sulted with chimneyer. Flue gas temperature lower than 60°C
during the combustion process increases risk of chimney damage by
condensation.
USAGE OF PELLET BURNER
Pellet burner needs air for combustion. Thereby, boiler room must have opening for
air inlet of at least 200 cm2. Pellet burner must not be started before it is verified, that
smoke can freely flow through boiler and chimney into atmosphere. Pellet are supplied
into burner from external feeder, connected to pellet container. Feeder has to be installed
under the 45°angle to ensure the best function and uniform fuel supply. Feeder
should be able to supply approximately 10 kg of pellets per hour of continual
operation / requirement for pellet supply. Pellets must be stored in well ventilated
room without moisture, or in specially designed container.
ATTENTION! Burner consists from components of high quality, that must not
be re-placed with less quality spare parts. If components are replaced by
other than original spare parts, warranty expires.
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