Condensing Heat Exchanger; Function; Removal - Biasi RIVA ADVANCE HE M110B.24SM/C Service Manual

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 Disconnect the flue system from the boiler.
2 Remove the fan group (rubber pipe, gas pipe) fol-
lowing the instructions from 1 to 6 in section 17.2.
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
(Fig. 5.2).
Unscrew the nuts H (Fig. 5.2).
5
Remove the fan---burner group I.
6
7 Empty the primary circuit of the boiler.
8 Remove the clips J (Fig. 5.2).
Loosen the connection K and slightly move the
9
pipe L upwards, turn it towards left (Fig. 5.2) and
then move the pipe downwards freeing it from the
Condensing heat exchanger.
10
A
J
I I
D
M N
Fig. 5.2
10 Loosen the connection M and slightly move the
pipe N upwards, turn it towards left (Fig. 5.2) and
then move the pipe downwards freeing it from the
Condensing heat exchanger.
Fig. 5.3
H
E
G
L K
R
P
F
Q
O