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10
Fan and Air box
10.1
Function
The function of the Fan A (Fig. 10.1) is to force the mix-
ture 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
Fig. 10.1
10.2
Removal of the Fan and the Air box
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).
F
E
D
A
C
Fig. 10.2
B
D
Fan gasket
3
Disconnect the rubber pipe C (Fig. 10.2).
4
Unscrew the gas connectors D and remove the
gas pipe E.
5
Disconnect the connector F
6
Disconnect the fan connector G by pressing the
plastic hook placed on the side of the connector.
Unscrew the screws H.
7
Remove the fan A with the air box B.
8
Remove the screws I and the air box B (Fig. 10.3).
9
Fig. 10.3
10
Open the strip J by sliding the edges with the help
of a screwdriver and remove the Air box
Fig. 10.4.
G
Fig. 10.4
11
Assemble the Fan and the Air box carrying out
the removal operations in reverse sequence.
H
Before reassembling ensure the fan gasket
(Fig. 10.2) is correctly mounted.
After any service operation on the components of
the gas circuit check all the connections for gas
leaks.
Warning: After cleaning or replacement as
detailed above, it is deemed necessary to
undertake a combustion analysis as detailed
in chapter 8.3 section 11.
I
J
I
B
I
B
27
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