Biasi Activ A 12OV, Руководство по обслуживанию, Страница: 12 / 36

10
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.
A
B
C
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.
4 Disconnect the air manifold D (Fig. 5.4) by pulling
it.
5 Disconnect the rubber pipe
E
(Fig. 5.2).
6 Unscrew the gas connectors
F
.
7 Remove gas pipe G .
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 .
11 Disconnect the connector K by pressing the plas-
tic hook placed on the side of the connector.
12 Disconnect the connector L
J
I
H
K
E
F
G
L
Y
N
S
X
N
Y
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).
O
P
Fig. 5.3
14 Empty the primary circuit of the boiler.
15 Remove the forks N (Fig. 5.2).
16 Loosen the connection O and remove the pipe P
(Fig. 5.3) from the Condensing heat exchanger.