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II ( ) or must be correctly connected to
earth.
Connecting the zone valves controlled
by the ambient thermostat
Ambient
Thermostat
T
V
Zone valve
with micro contact
Fig. 6.21
Use the ambient thermostat's clamps indi-
cated in Fig. 6.15 and Fig. 6.16 to connect
the zone valve Insert the electric cables of
the zone valve's micro switch contacts in
clamps "1 and 3" of the ambient thermo-
stat's terminal block as in Fig. 6.16.
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. 6.16.
Allow the cables to exit the boiler by using
the relevant cable clamps Y (Fig. 6.17).
- 52 -
INSTALLATION
N
L
6.11 External frost protection
• Connect the frost thermostat between ter-
minals 1 and 2 as shown in Fig. 6.22 or
Fig. 6.23.
Do not connect live wires to terminals to
which the frost thermostat must be con-
nected.
Frost Thermostat
(230V rating)
T
T
Fig. 6.22
Frost thermostat
(230V rating)
T
T
Fig. 6.23
Room thermostat
(230V rating)
N
L
3
2
1
Room
thermostat
with anticipating
resistor
(230V rating)
N
L
3
2
1
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