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Frost
thermostat
T
(230V rating)
3 2 1
External controls
terminal block
Fig. 6.21
6.11 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. 6.22 and Fig. 6.23 are divided in two
parts.
The upper shows the single components
used on the diagrams with their connection
to the 10 way junction box. The bold num-
bers represent the terminal of the junction
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 water.
In Fig. 6.22 the boiler is permanently con-
nected to the main supply. The boiler op-
eration is controlled by the external control
terminal block.
INSTALLATION
Room
thermostat
with anticipating
T
resistor
(230V rating)
N
L
Power supply
terminal block
In Fig. 6.23 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. 6.22).
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