Installation manual

Installation and servicing instructions strictly reserved for qualified gas installers
43
Legend
1 Automatic air vent
2 Pump retaining screw
3 Pump
4 Discharge pipe
5 Flow sensor retaining clip (*)
6 Flow sensor (*)
7 Flow sensor retaining clip (*)
8 Cold water filter retaining clip (*)
9 Cold water filter (*)
10 Filling tap (*)
11 Filling pipe retaining clip (*)
12 Filling pipe retaining clip (*)
13 Flow sensor connector (*)
14 “Foaming” filter retaining clip
15 “Foaming” filter
16 Discharge pipe retaining clip
17 DHW exchanger retaining screw (*)
18 Discharge valve
19 Heating safety valve
20 Heating safety valve retaining clip
21 Filling tap (*)
22 Heating pressure sensor retaining clip
23 Discharge retaining clip
24 Three-way valve
25 DHW exchanger (*)
26 Three-way valve connector
27 Heating pressure sensor connector
28 Heating pressure sensor
(*) Not required on SB models
15.1.1 Pump
Unscrew the pump’s 4 retaining screws
(2).
Remove the pump motor (3).
Fit the new pump motor by repeating
the operations in reverse.
15.1.2 DHW exchanger
Remove the two retaining screws (17)
accessible from the front of the boiler.
Remove the DHW exchanger (25).
Fit the new DHW exchanger by
repeating the operations in reverse.
Check the assembly direction: the word
“TOP” printed on the exchanger edge
(25) must be positioned towards the
top.
15.1.3 Flow sensor
Remove the retaining clip from the
filling pipe (12), and pivot the tap and
the filling pipe.
Disconnect the connector (13) located
under the flow sensor.
Remove the clips (5) and (7).
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Unscrew the cold water inlet joint under
the boiler.
Remove the flow sensor (6).
Fit the new flow sensor by repeating the
operations in reverse.
15.1.4 Heating pressure sensor
Remove the retaining clip (22) from the
heating pressure sensor.
Disconnect the connector (28).
Remove the heating pressure sensor
(29).
Fit the new heating pressure sensor by
repeating the operations in reverse.
15.1.5 Heating safety valve
Release the heating safety valve
retaining clip (20).
Remove the heating safety valve (19).
Fit the new heating safety valve by
repeating the operations in reverse.
15.1.6 Three-way valve
Disconnect the 3-way valve connector
(26).
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