Arca Caldaie ASPIRO DUO TECH, Установка, эксплуатация и обслуживание

Страница: 9 / 63

9
3. MAIN BOILER COMPONENTS
3.1. Wood charging box
This is the boiler
fuel box. In this box, located in the boiler upper part, the wood logs are charged after being
succesfully performed the ignition procedure, getting a first layer of hot ashes.
3.2. Main burner refractory frame and cast iron bar elements
In the middle part of the boiler, between the fuel box and the bottom part where the heat exchange takes
place, is located the burner, built with a special designed refractory cement frame with a slot in its central part
and a grate.
3.3. Heat exchange area and catalizator
The gases released by wood, after being passed through the cast iron bars, light producing a bluish vertical
reverse flame, which touches a special shaped chrome cast iron cylinder called "the catalyst".
The flame, passing through this cast iron element, which reaches a very high temperature, will have
completely burnt the main part of its residual carbon particles, which couldn't be burnt before.
3.4. Smoke drafting pass-through box and fan
The combustion products, after having gotten colder delivering a part of their heat charge to the water, are
collected in the smoke pass-through drafting box in the back part of the boiler. In the smoke pass-through
box is located the two speeds fan, mounted in horizontal axis configuration, which includes the electric motor
and the impeller. Any maintenance operation on the fan is easy to be carried out because the fan is fixed by
mean of wing nuts.
3.5. Air distribution subassembly
The immission duct has an internal gravitational closing door that closes the air passage when the drafting
fan stops, and another temperature commanded external closing.
The air that enters the central section is then divided in primary air and secondary air. The primary any air
stream enters the wood collecting box where, mixing with the distilled gas generates the combustible mixture
that is then fired when passes through the burner grate. The secondary air stream, instead, passes through
the two cavities located the in the burner main body and in the cast iron bars, providing by this way a further
oxygen charge directly in the flame formation area getting a complete combustion.
Key :
1 Primary air stream adjusting
2 Secondary air stream adjusting
3 Flame control bull's eye
4 Bottom door (combustion chamber)
5 Upper door (wood box)
6 Combustion air modulator
7 Anti deflagration door
8 Fan motor
9 Hot sanitary water heat exchanger (SA
versions only)