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7
D .H .W . HEAT EXCHANGER
7 .1 Function
The d.h.w heat exchanger A in Figure 7.1 and Fig. 4 allows the
instantaneous transfer of heat from the primary hydraulic circuit
to the water destined for d.h.w use.
Figure 7 .1
The schematic structure is shown in Figure 7.2.
Primary hydraulic circuit
Domestic hot water circuit
Figure 7 .2
7 .2 Removal
Warning: isolate the boiler from the mains electrici-
ty supply before removing any covering or compo-
nent .
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 7.3 (see section "Removal
pump" page 16).
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.
D.H.W. HEAT EXCHANGER
A
Figure 7 .3
6 Completely unscrew the two Allen key screws G (Figure 7.4)
Figure 7 .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 7 .5
D
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 indi-
cated in Figure 7 .5 towards the left side of the boiler .
B
E
F
A
G
- 15 -
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