Table of Contents
Advertisement
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.
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
figure 17.1
17.2 Removal of the Air box and the fan
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent.
1 Turn off the gas supply.
2 Remove all the case panels (see section 2).
J
h
I
A
figure 17.2
- 40 -
fAN ANd AIR Box
C
f
d
B
G
E
3 Disconnect the air manifold E (Figure 17.2).
4 Disconnect the rubber pipe F.
5 Unscrew the gas connector G.
6 Remove the fixing fork H and remove the gas pipe I.
7 Disconnect the connector C
8 Disconnect the fan connector D 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).
K
figure 17.3
12 Assemble the Fan and the Air box carrying out the removal
operations in reverse sequence.
Before reassembling ensure the fan gasket (figure 17.2) is
correctly 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
circuit check all the connections for gas leaks.
Warning: After cleaning or replacement as detailed
above, it is deemed necessary to undertake a com-
bustion analysis as detailed in section 11.3.
K
B
K
Hide quick links:
Advertisement
Table of Contents
