Removal Of The Air Box And The Fan - Biasi RIVA ADVANCE HE M110B.24SM/C Service Manual

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
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).
K
M
C
Fig. 17.2
B
L
3 Disconnect the air manifold C (Fig. 17.2) by pul-
ling it.
I
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)
Remove the fixing fork F and remove the gas pipe
6
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.
Disconnect the fan connector K by pressing the
9
plastic hook placed on the side of the connector
(Fig. 17.2).
Unscrew the screws L (Fig. 17.2).
10
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.
D
F
H
G
37