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the zone valve's micro switch contacts in
clamps "1 and 3" of the ambient thermo-
stat's terminal block as in Fig. 6.17 .
Remove the electric jumper between "1
and 3".
Be careful not to connect pow-
ered cables on clamps "1 and
3".
The route of the boiler and ambient thermo-
stat's electric power supply cable or wires
must follow the route indicated in Fig. 6.17 .
Allow the cables to exit the boiler by using
the relevant cable clamps Q ( Fig. 6.18 ).
6.12 Connecting a system boiler to
a cylinder
Two schematic wiring diagrams are given in
this section showing two possible ways to
connect an external programmer to a mid-
position diverter valve to provide independ-
ent timed and thermostatic control of heat-
ing and hot water.
Fig. 6.24 and Fig. 6.25 are divided in two
parts. The upper shows the single compo-
nents used on the diagrams with their con-
nection to the 10 way junction box. The bold
numbers represent the terminal of the junc-
tion box where the component must be con-
nected to.
The lower part shows how to realize a sys-
tem that provides independent timed and
thermostatic control of heating and hot wa-
ter.
In Fig. 6.24 the boiler is permanently con-
nected to the main supply. The boiler op-
eration is controlled by the external control
terminal block.
In Fig. 6.25 the boiler is not permanently
connected to the supply line. The boiler op-
INSTALLATION
eration is controlled by switching the mains
supply.
In this case, when the boiler is switched off
some important features like the antifreeze
system, the monitoring of the boiler by the
operation lights, the post circulation of the
pump, etc. are completely deactivated.
For these reasons it is advisable to use the
fi rst diagram ( Fig. 6.24 ).
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