Operating Principle - Immergas LUXOR Series Manual

LUXOR
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The high combustion quality is guaranteed by an electronic
microprocessor that regulates and optimises the fuel inlet (6
mm pellet) that, falling from the main tank, flows into a worm
screw auger, fed by an electric gearmotor (controlled by the same
P.C.B.) which, according to its speed, makes more or less pellets
arrive inside the combustion chamber.
The P.C.B. also controls an inverter for fan operation for the
expulsion of the flue gas, also creating the right negative pressure
to draw the correct amount of inlet combustion air from the
room (where the boiler is located).
With normal combustion, the flame must have a tapered, com-
pact shape and be "lively" with tips that are mainly vertical or
pressed against the back of the furnace.
The power supplied by the boiler is automatically modulated,
depending on the heat requested by the P.C.B..
The ability to modulate the power avoids continuous switching
on and off of the boiler, thus maintaining very high efficiency.
By falling, the pellet arrives in the cast iron crucible where, inside
the carbon steel chamber (resistant to very high temperatures)
the actual combustion takes place.
KEY:
1 - Pellet tank
2 - Pellet loading auger
3 - Circulation pump
4 - Fan
5 - Incandescent electrode
6 - Crucible
7 - Smoke pipes
8 - Manual pipe scraper lever

OPERATING PRINCIPLE

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At first ignition or re-ignition after a switch-off for reaching the
temperature, there is an incandescent electrode which allows to
fully automatically ignite the flame.
The electrode resistance, located under the crucible, heats the
combustion air at a very high temperature (hairdryer effect)
which in turn, ignites the pellet in the brazier itself.
The hot flue gas produced directly by combustion are directed
towards a row of 10 heat exchange pipes (smoke pipes) with the
system water (1st round of smoke), made to move by a very low
electric consumption circulator located on the boiler return.
The hot flue gas meets a vermiculite cover and is channelled
along the other 6 pipes located on the back of the boiler, giving
water the additional heat present in the flue gas before their
expulsion (2nd round of smoke), by means of the fan.
There are turbulators inside the smoke ducts that are manually
operated via a special lever, to clean the heat exchanger surfaces,
as well as ensure and maintain an optimal heat exchange.
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