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Voltage free
contacts for the
ambient thermostat
T
Figure 5.22
The thermostat must have insulation class II ( )
or be correctly connected to the ground.
Connecting zone valves controlled by the
ambient thermostat
Ambient
thermostat
T
V
Zone valve with
microcontacts
Figure 5.23
Use the ambient thermostat terminals indi-
cated in Figure 5.19 and Figure 5.20 to connect
the zone valves. The electric conductors of the
zone valve micro contacts must be inserted in
the "1 and 3" terminals of the ambient thermo-
stat terminal board as shown in Figure 5.20.
- 42 -
INSTALLATION
1
N
L
The electric jumper between "1 and 3" must
be removed.
Do not connect live cables on the
"1 and 3" terminals.
The path of the boiler and ambient thermostat
power supply cable or wires must follow the
path indicated in Figure 5.20.
Make the boiler cables exit using specific cable
glands O (Figure 5.21).
5.12 Installing the external tempera-
ture probe
(optional)
The external probe must be installed on the
external wall of the building avoiding:
• Direct radiation of the sun's rays.
• Humid walls or walls subject to the formation
of mildew.
• Installation near fans, drain outlets or chim-
neys.
5.13 Electric connection between the
boiler and the external probe
To connect the external probe to the boiler use
electric cables with a section no less than 0.50
mm
.
2
The electric conductors for connecting
the external probe to the boiler must go
through different channels than those for
the mains voltage (230 V), as they are sup-
plied with low safety voltage and their max-
imum length may not exceed 20 metres.
Use the terminals indicated in Figure 5.24 to
connect the external probe.
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