Condensing Heat Exchanger; Function; Removal - Biasi M110.24SM/E 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.
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 Disconnect the flue system from the boiler.
2 Remove the air box following the instructions
from 1 to 7 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 rear side of the con-
nector (Fig. 5.3).
5 Unscrew the nuts H (Fig. 5.2).
6 Remove the fan---burner group I.
7 Empty the primary circuit of the boiler.
A
E
F
I
D
Fig. 5.2
G
Fig. 5.3
8 Disconnect the C.h. temperature probe J and the
flue temperature probe connector K (Fig. 5.4).
H
9