27
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
special 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
system (*)
– 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 sensor
The boiler is prearranged for connection to an external air
temperature 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
20
15
10
5
0
-10
-15
-5
-20
80
90
70
60
50
40
30
20
°C
°C
K=9
K=7
K=8
K=5
K=6
K=3
K=4
K=2
K=1
External temperature
Fig. 31
m
CAUTION
If there is an external sensor, in order to select the
optimal climatic curve for the system and therefore the
delivery temperature based on the external temperature:
– press the button
t
for 1 second
– press buttons
>
or
<
until the required curve K has
been selected (within the range
K=0.0 - K=9.0
).
6.12.2 Chrono-thermostat or Air Thermostat
The electrical connection of the chrono-thermostat or air
thermostat has already been described. When fitting the
component in the room where the readings are to be taken, follow
the instructions 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 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.
R
M
SE
TA
CR
Fig. 32
MULTI ZONE system - with zone valve, air thermostat and
external sensor.
TA
TZ1
VZ1
VZ2
VZ3
TZ2
TZ3
SE
R
M
Fig. 33
m
CAUTION
Set the parameter "tS 17 = DELAY SYSTEM PUMP
ACTIVATION to allow the opening of zone valve Vz.
