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INST
ALLA
TION
INSTALLATION
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. 6.28 and Fig. 6.29 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. 6.28 the boiler is permanently con-
nected to the main supply. The boiler op-
eration is controlled by the external control
terminal block.
In Fig. 6.29 the boiler is not permanently
connected to the supply line. The boiler op-
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
first diagram (Fig. 6.28).
Summary of Contents for Activ A 25S
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