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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.
7KH ÀRZ UDWH RI WKH DLUJDV PL[WXUH DQG FRQVHTXHQWO\ WKH LQSXW
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
- 44 -
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 5HPRYH WKH ¿[LQJ IRUN ) DQG UHPRYH WKH JDV SLSH *
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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