Electronic pellet burner controller - NPBC-V6T-2
W
AY
OF
OPERATION
A burner controlled by NPBC-V6T-2 can work in continuous automatic mode or in timer
mode. While in timer mode, the burner works only during the intervals of the day and the days of
the week set from the user by heating to the temperature entered according to the timer.
The burning process goes through several stages: cleaning, igniting, unfolding the fire,
modulated burning process according to the current and set temperature of the boiler, intermediate
cleaning performed during the burning process, extinguishing and cleaning again after the final
extinguishing. The current stage of the burner is displayed in green color on the bottom line of the
main screen and at the same time is giving how many seconds remain till the end of time- limited
stages.
Every ignition begins with a cleaning cycle to clean all leftovers of the previous burning.
The main fan is set in the menu
Service Settings » Burning Setup » Fuel X » Cleaning
, line
Start, ,the exhaust fan is set from the same menu row
"Exhaust Fan".
The operation of
mechanisms for additional cleaning are set in menu
“Service settings" » "Additional cleaning"
row
Start.
The
additional cleaning start after the end of cleaning with a main fan. After the
cleaning phase follows the ignition phase.
The burner ignition procedure begins with loading the first dose of pellets into the burning
chamber. The ignition is done with the help of an electric heater and forced air from the burner
fans. The ignition procedure performed after loading the first dose with pellets has three stages.
During the first stage, only the electric heater works without fan, to reach the required ignition
temperature faster. During the next two stages, air supply to the burning chamber begins to run
simultaneously with the operation of the heater, and the heat from the heater is transferred to the
pellets and the necessary oxygen is delivered to ignite the fuel. Usually during Stage 2 the fan is
set at a lower speed not to cool the flame, and after a more stable fire to increase the air flow
during Stage 3. From the menu
"Service settings"
»
"Burning Setup"
»
"Fuel Х"
»
"Ignition"
can be
set
the maximum duration of each stage of ignition and the speed of the main and exhaust
fan. When the photosensor detects the light from the burning fire the ignition heater turns off and
the burner goes to unfolding fire phase to stabilize the fire, while the burning chamber is not yet
hot enough. If the pellets do not ignite within the set time, the burner loaded a new portion of
pellets and makes a new attempt to ignite. In order not to fill the burner with unburned pellets, the
quantity of any new pellets will decrease twice with the next ignition attempt. New pellets are
supplied only the First 3 ignition tries in a proportion by 100%, 50% and 25% of the set dose.
After the last ignition attempt, the burner stops and display an error message for ignition fail. The
parameters for the first dose and the ignition attempts can be set in the menu as default start with
the option settings displayed in the menu
Service Settings » Burning Setup » Fuel X»
Ignition
. The parameters for detection of the burning fire or extinguished fire can be set in the
menu
Service Settings » Flame Detection
The successful ignition is followed by the smooth unfolding procedures. If the fire is still
unstable and the burning chamber is cold start feeding pellets and air for maximum power. The
flame can be smother or blow off. To prevent this, first wait for the burning of the first dose of
pellets and then slowly increase in power from the lowest power P1 to the highest required power,
depending on the difference in temperature (set temperature and water temperature in the boiler).
The parameters for the Unfolding fire process can be set from the menu
Service Settings »
Burning Setup » Fuel X » Unfolding Fire
User Manual / ver. 1.2
http://www.naturela-bg.com/en/
page 8 of 41
