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5
Condensing heat exchanger
5.1
Function
The Condensing heat exchanger A in Fig. 5.1 has the
function of transferring heat produced from combus-
tion of the gas and from the flue exhausted gas to the
water circulating in it.
C
B
Fig. 5.1
By reducing the combustion products temperature, the
latent heat of the vapour is transferred to the water cir-
cuit, allowing an extra gain of useful heat.
The condensed vapour is then drained through the
condensate trap B and the draining pipe C.
5.2
Removal
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 (see section 2).
3
Disconnect the flue system from the boiler.
Disconnect the air manifold D (Fig. 5.4) by pulling
4
it.
5
Disconnect the rubber pipe E (Fig. 5.2).
Unscrew the gas connectors F.
6
Remove gas pipe G .
7
8
Unscrew the screws and remove the detection
electrode connector H.
9
Unscrew the screws and remove the ignition elec-
trodes connector I .
10
Unscrew the screw and remove the overheat
thermostat J .
Disconnect the connector K by pressing the plas-
11
tic hook placed on the side of the connector.
Disconnect the connector L
12
10
A
N
Y
S
H
N
X
F
E
F
Fig. 5.2
13
Disconnect the fan connector M by pressing the
plastic hook placed on the side of the connector
(Fig. 5.4).
Fig. 5.3
14
Empty the primary circuit of the boiler.
Remove the forks N (Fig. 5.2).
15
16
Loosen the connection O and remove the pipe P
(Fig. 5.3) from the Condensing heat exchanger.
K
Y
J
I
L
G
P
O
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