Fan And Air Box; Function; Removal Of The Fan Group - Biasi M110.24SM/E 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 fan group

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).
H
E
I
F
Fig. 17.2
Disconnect the rubber pipe C (Fig. 17.2).
3
34
B
C
G
4 Unscrew the gas connector D (Fig. 17.3)
5 Remove the fixing fork E and remove the gas pipe
F (Fig. 17.2).
Loosen without removing the screw G.
6
Fig. 17.3
7 Remove the screws H and the air box I. Leave the
air box with the air hose clamped to the water
pipe.
8 Disconnect the fan connector J by pressing the
plastic hook placed on the rear side of the con-
nector (Fig. 17.4).
Unscrew the screws K (Fig. 17.5).
9
J
Fig. 17.4
D