Bedienungsanleitung ATTACK DPX Combi Pellet (Seite 47 von 100) (Englisch)

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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.

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ATTACK DPX Combi Pellet Seite 47

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