37
17
Fan and Air box
17.1
Function
The function of the Fan
A
(Fig. 17.1) 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
B
Fig. 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 and the sealed
chamber lid (see section 2).
C
K
L
M
Fig. 17.2
3
Disconnect the air manifold
C
(Fig. 17.2) by pul-
ling it.
F
G
I
D
H
J
Fan gasket
Fig. 17.3
4
Disconnect the rubber pipe
D
(Fig. 17.3).
E
Fig. 17.4
5
Unscrew the gas connector
E
(Fig. 17.4)
6
Remove the fixing fork
F
and remove the gas pipe
G
(Fig. 17.3).
7
Loosen without removing the screw
H
.
8
Remove the screws
I
and the air box
J
. Leave the
air box with the air manifold clamped to the water
pipe.
9
Disconnect the fan connector
K
by pressing the
plastic hook placed on the side of the connector
(Fig. 17.2).
10
Unscrew the screws
L
(Fig. 17.2).
11
Remove the fan
M
.
12
Assemble the Fan and the Air box carrying out
the removal operations in reverse sequence.
Before reassembling ensure the fan gasket
(Fig. 17.3) is correctly mounted.
Warning: After cleaning or replacement as
detailed above, if it deemed necessary to
undertake a combustion analysis, refer to
the appropriate chapter
Maintenance
of the
installation instructions manual.
Содержание RIVA ADVANCE HE M110B.24SM/C
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