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Description of burner function
ATTENTION! Burner works with boiler thermostat only, eventually extended with room
thermostat. In both cases it has to be connected through protection against boiler overheating.
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. Afterwards, 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 being
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 bottom 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), control
system immediately begins transition period. Pellet burner continues in operation as by normal start.
(see above)
Normal start, when no flame is recongnized by control system
Normal start-up process runs even in case, if there is no flame signal received by control system.
Shortly after, system begins the new start-up trial again, when fuel supply for ignition is reduced to
45 % and it can be reduced during the whole ignition period. These parameters can be changed in
service menu – by trained person only. If the second trial fails, all functions are turned off and alarm
is activated. This alarm is indicated on display.
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 consulted with
chimneyer. Flue gas temperature lower than 60°C during the combustion process increases risk of
chimney damage by condensation.
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