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17 fan and air bOx
17 .1 function
The function of the Fan A (Figure 17.1) is to force the mixture of air
and gas into the burner.
The function of the Air box B is to mix the gas and the air in the right
proportion.
The flow rate of the air-gas mixture and consequently the input
power of the boiler is proportional to the speed of the fan that is
controlled by the electronic control p.c.b.
a
figure 17 .1
17 .2 removal of the air box and the fan
warning: isolate the boiler from the mains electricity
supply before removing any covering or component .
1 Turn off the gas supply.
2 Remove all the case panels (see section 2).
J
h
i
a
figure 17 .2
- 42 -
Fan and air box
b
c
f
b
G
e
3 Disconnect the air manifold C (Figure 17.2).
4 Disconnect the rubber pipe D.
5 Unscrew the gas connector E.
6 Remove the fixing fork F and remove the gas pipe G.
7 Disconnect the connector H
8 Disconnect the fan connector I by pressing the plastic hook
placed on the side of the connector.
9 Unscrew the screws J.
10 Remove the fan A with the air box B.
11 Remove the screws K and the air box B (Figure 17.3).
figure 17 .3
12 Assemble the Fan and the Air box carrying out the removal op-
erations in reverse sequence.
before reassembling ensure the fan gasket (figure 17 .2) is cor-
rectly mounted .
warning: be careful not to damage the Or gasket of
the gas pipe when inserting the pipe in the air box (air/
gas mixer) .
after any service operation on the components of the gas cir-
cuit check all the connections for gas leaks .
warning: after cleaning or replacement as detailed
above, it is deemed necessary to undertake a combus-
tion analysis as detailed in section 11 .3 .
d
K
K
b
K
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