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EN
m
CAUTION
It is compulsory:
– to use an omnipolar cut-off switch, disconnect
switch, in compliance with EN standards (contact
opening of at least 3 mm)
– if the power cable is to be replaced, that ONLY a spe-
cial cable is used with a factory produced re-wired
connector, ordered as a spare part and connected by
a professionally qualified person
– to connect the earth wire to an effective earthing sys-
tem (*)
– that before any intervention on the boiler, the mains
power is disconnected by setting the main system
switch to "OFF".
(*) The manufacturer is not responsible for any damage caused
by failure to earth the appliance or failure to observe the
information provided in the wiring diagrams.
d
IT IS FORBIDDEN
To use water pipes for earthing the appliance.
6.12.1
External temperature sensor
The boiler is prearranged for connection to an external air tem-
perature sensor and can operate with a sliding temperature.
This means that the delivery temperature sent to the boiler can
vary on the basis of the external temperature depending on the
climatic curve selected from those shown in the diagram (Fig.
31).
When fitting the sensor on the outside of the building, follow the
instructions provided on the packaging of the product itself.
Climatic curve
Delivery temperature
°C
90
K=9
K=8
80
70
60
50
40
30
20
20
15
10
5
m
CAUTION
If there is an external sensor, in order to select the opti-
mal climatic curve for the system and therefore the de-
livery temperature based on the external temperature:
– press the button
t
– press buttons
>
or
been selected (within the range K=0.0 - K=9.0 ).
K=7
K=6
K=5
K=4
K=3
K=2
K=1
°C
0
-5
-10
-15
-20
External temperature
Fig. 31
for 1 second
<
until the required curve K has
6.12.2
Chrono-thermostat or Air Thermostat
The electrical connection of the chrono-thermostat or air ther-
mostat has already been described. When fitting the component
in the room where the readings are to be taken, follow the in-
structions provided on the packaging of the product itself.
6.12.3
EXAMPLE of use of the command/control device
on some types of heating systems
KEY
M
System delivery
R
System return
CR
Remote control
SE
External temperature sensor
TA
Air thermostat for boiler activation
TZ1÷TZ3 Air thermostat for the zone
VZ1-VZ3 Zone valves
RL1-RL3 Zone relays
P1-P3
Zone pump
TSB
Low temperature safety thermostat
ONE DIRECT ZONE system , external sensor and air thermostat.
SE
M
R
CR
TA
MULTI ZONE system - with zone valve, air thermostat and ex-
ternal sensor.
TA
TZ1
SE
M
R
VZ1
m
CAUTION
Set the parameter "tS 17 = DELAY SYSTEM PUMP ACTI-
VATION to allow the opening of zone valve Vz.
Fig. 32
TZ2
TZ3
VZ2
VZ3
Fig. 33
69
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