8
Technical features and dimensions
3
8
11
1
2
14
13
17
12
15
18
M
R
9
10
16
4
6
5
F
F
7
2.3 - MAIN COMPONENTS
1. Panel board
2. Casin top panel
3 N°2 side panels
4. Anti-smoke door fitted on hinges
5. Wood storage door with refractory insulation
and sealing rope.
6. Central door with sealing gasket &locking
screws for primary and secondary air
7. Fan ( n°2 fan for the models AIREX 65 2S and
AIREX 80 2S)
8. Combustion chamber door with sealing gasket,
refractory insulat. & flame sight glass
9. Combustion chamber in thick steel
10.
Heat exchange fin
11. Boiler drain
12. Thermal discharge safety heat exchanger
13. Smoke by-pass with rod
14. Boiler body insulation in mineral wool
15. Boiler body
16. Refractory burner with fire bars and grate
17. Smoke chamber
18. Thermostatic valve
M C.H. flow
R C.H. return
fig. 2
N.B.:
The fire bars and the refractory steel grate are subject to wear; it is therefore advisable
to carry out an annual inspection to prevent bad boiler operation.
2.4 - GENERAL INFORMATION:
REVERSED FLAME COMBUSTION
Every body knows that to make a match lasting it must be held
with its head upwards.
This is because it is necessary that the flame, in its convective
motion, does not meet another fuel in addition to the one which
has generated it. As in residential heating the fuel is in form of
wood logs which are loaded from the top, the flame has to go in
the opposite way, i.e. downwards.
Natural draught is a very variable source of depression, accor-
ding to the type of chimney, on the weather conditions, on the
type of fuel, etc.
Therefore it is necessary to integrate it with forced ventilation
in order to stabilize it.
By fitting a fan it is possible to considerably reduce the section
of the gas passages on the grate and furthermore there are no
problems with cold starts.
The small grate permits a more controlled passage of combustion
air, contrarily to what happens with the large traditional grates.
The air can be perfectly dosed because the grate, covered with
fired wood, has the same crossing resistance and thus the
combustion will be always optimal.
Unical has already used this principal for many years with the
GASOGEN G3 2S boiler.
The AIREX 2S boiler today has reached such a high level of
perfection that it can pass all the most stringent tests foreseen
by the European Standards in force concerning the environment.
