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

6

d .h .w . heat exchanGer

6 .1 function

The d.h.w heat exchanger A in Figure 6.1 and Figure 6.3 allows
the instantaneous transfer of heat from the primary hydraulic cir-
cuit to the water destined for d.h.w use.
figure 6 .1
The schematic structure is shown in Figure 6.2.
Primary hydraulic circuit
Domestic hot water circuit
figure 6 .2

6 .2 removal

warning: isolate the boiler from the mains electricity
supply before removing any covering or component .
1 Remove the front and right hand side panels of the case.
2 Empty the primary circuit and the d.h.w circuit of the boiler.
3 Remove the pump B in Figure 6.3 (see section "Removal
pump" page 15.
4 Remove the clip C and remove the primary circuit pressure
switch D by lifting it upwards. It is not necessary to disconnect
it from the wiring.
5 Remove the clip E and remove the electric actuator F by pull-
ing it. It is not necessary to disconnect it from the wiring.
- 14 -
D.h.w. heat exchanger
a
figure 6 .3
6 Completely unscrew the Allen key screws G (Figure 6.4)
figure 6 .4
7 Move the exchanger towards the rear of the boiler and extract
Reassemble the d.h.w. heat exchanger carrying out the removal
operations in the reverse order.
figure 6 .5
d
a
c
which hold the exchanger to the plastic groups.
it.
warning: to lubricate the O-ring gaskets exclusively
use a silicone base grease compatible to be in con-
tact with foods and approved by the local water au-
thorities .
warning: when reassembling the exchanger be sure
to put the off center location/securing pin indicated
in figure 6 .5 towards the left side of the boiler .
f
e
a
G
b