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5
PRIMARY HEAT EXCHANGER
5 .1 Function
The primary heat exchanger A in Figure 5.1 has the function of
transferring heat produced from combustion of the gas to the
water circulating in it.
Figure 5 .1
The hydraulic circuit is composed of 8 elliptical pipes connected
in parallel (Figure 5.2).
Figure 5 .2
5 .2 Removal
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
1 Remove the case panels and the sealed chamber lid (section
"Body panels" page 5).
2 Empty the primary circuit of the boiler.
3 Remove the combustion chamber lid B by unscrewing the
screws C (Figure 5.3).
4 Remove the screws D and the plate E.
5 Remove the clip F.
6 Loosen the connection G and slightly move the pipe H up-
wards.
7 Remove the clip I and the safety thermostat J and the c.h.
temperature probe K. It is not necessary to disconnect it from
the wiring.
- 12 -
PRIMARY HEAT EXCHANGER
A
C
B
C
L
Figure 5 .3
8 Loosen the connection L and move the pipe M downwards
freeing it from the connection of the primary heat exchanger.
9 Remove the clip N.
10 Loosen the connection O.
11 Free the pipe P from the connection of the condensing heat
exchanger; lift and rotate it towards right.
12 Remove the heat exchanger by sliding it forwards.
13 Reassemble the boiler carrying out the removal operations in
reverse order. Fit the clip I with the arrow pointing upwards as
illustrated in Figure 5.3.
IMPORTANT: do not force the connection G when
tightening it .
5 .3 Cleaning
If there are deposits of soot or dirt between the blades of the heat
exchanger, clean with a brush or non-metallic bristle brush.
In any case, avoid any actions that can damage the protective
varnish with which the exchanger has been covered.
Warning: After cleaning or replacement as detailed
above, if it deemed necessary to undertake a com-
bustion analysis, refer to the appropriate chapter
Maintenance of the installation instructions manual .
F
H
N
G
P
J
I
K
M
E
D
O
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