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ATTACK DPX Combi Pellet Manual

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46
EN
9.4 DESCRIPTION OF FUNCTION
ATTENTION: The burner is controlled on the basis of the boiler temperature sensor (in
the burner menu must be set in the advanced settings THERMOSTAT to the "Combina-
tion") or room thermostat, if is connected to the terminals TP under the electrical scheme.
It is possible to choose boiler temperature and hysteresis in burner menu. The burner will
try to achieve the set temperature and according to hysteresis the burner will be turned
on.
9.4.1 NORMAL START–UP IN STAND–BY MODE OF BURNER
When the thermostat gives instruction to the burner, the ventilator starts and the photocell con-
trols the fire. If there is no fire, then comes the instruction to blow the burner through. After-
wards, pellets start to fall into the burner within the period stated by the control system and the
ignition is activated. After the phase of fuel feeding for ignition is finished, the control system
waits for signalization of fire from the photocell. When the photocell recognizes the fire, small
amounts of pellets fall within the transition period. Duration of this depends on the output level
set on the burner. Pellet supply is gradually increased, until the necessary fuel amount for the
required output is achieved. This amount is further delivered into the burner, until the operation
thermostat gives instruction to stop.
This signal stops the pellet inlet, while ventilator continues to supply the air into the burner.
When the photocell recognizes burn–out of pellets, the blow–through of the burner begins.
According to the adjusted delay, the burner is cleaned after the fuel burns out – the grate moves
out towards the scraper and the ash with the unburned elements falls through the front wall of
the burner´s bottom into the ashpan. After the grate slides back, the burner waits for the new
signal from thermostat.
CAUTION: : The unit for the grate moving is very strong and it might cause a threat. Nev-
er put any body parts or foreign articles into the burner, while it is working.
9.4.2 BURNER START–UP, WHEN THERE IS STILL FIRE IN THE BURNER
If the photocell recognizes the fire during the beginning phase (e.g. after the short time current
shortage), the control system directly begins the transition–phase and the pellet burner contin-
ues to operate as by normal start. (see above)
9.4.3 BURNER START–UP, WHEN THE CONTROL SYSTEM DOES NOT RECOG-
NIZE THE FIRE
The normal start–up process follows, also when the control system does not receive the fire sig-
nal. The system starts shortly after repeated ignition process, which increases the ignition
amount in the combustion chamber and heating of spiral continues until the photocell does not
detect the presence of flame. These parameters are adjustable only by the trained person in ser-
vice menu. If the second trial fails, all functions are turned off and the alarm is activated. This
alarm is indicated on display.
… 47 …


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