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5
CONDENSING HEAT EXCHANGER
5.1 Function
The Condensing heat exchanger A in (Figure 5.1) has the func-
tion of transferring heat produced from combustion of the gas
DQG IURP WKH ÀXH H[KDXVWHG JDV WR WKH ZDWHU FLUFXODWLQJ LQ LW
C
B
Figure 5.1
By reducing the combustion products temperature, the latent
heat of the vapour is transferred to the water circuit, 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 'LVFRQQHFW WKH ÀXH V\VWHP IURP WKH ERLOHU
2 Remove the fan group (rubber pipe, gas pipe) following the
instructions from 1 to 6 in section "Removal of the Air box and
the Fan" page 44.
3 Disconnect the detection electrode connector D, the ignition
electrodes connector E and the earth wire F.
4 Disconnect the fan connector G by pressing the plastic hook
placed on the side of the connector (Figure 5.2).
5 Unscrew the nuts H (Figure 5.2).
6 Remove the fan-burner group I.
7 Empty the primary circuit of the boiler.
8 Remove the clips J (Figure 5.2).
9 Loosen the connection K and slightly move the pipe L up-
wards, turn it towards left (Figure 5.2) and then move the pipe
downwards freeing it from the Condensing heat exchanger.
- 14 -
CONDENSING HEAT EXCHANGER
A
H
J
G
N
E
M
Figure 5.2
10 Loosen the connection M and slightly move the pipe N up-
wards, turn it towards left (Figure 5.2) and then move the pipe
downwards freeing it from the Condensing heat exchanger.
Figure 5.3
11 Using pliers, remove the spring O moving it downwards and
disconnect the rubber pipe P (Figure 5.3).
12 Unscrew the screws Q and remove the clamps (Figure 5.3).
13 Disconnect the two connectors R by pressing the plastic hook
F
I
L
D
K
R
Q
O
P
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