67
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.
38). The climatic curve is set by changing parameter "
tS 0.4
“.
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 10 0 -10 -20 -30
35
45
55
65
75
85
°C
°C
Kt=1
Kt=2
Kt=2,5
Kt=1,5Kt=3
External temperature
Fig. 38
m
CAUTION
Where there is an external sensor, the temperature
setpoint that can be set for central heating is
dependent on the external temperature detected by
the sensor and by the "
Kt
" factor set using parameter
"
tS 0.4
".
Turn the multifunctional heating dial
t
to change
the setpoint calculated by moving its value by + or -
13°C. If the dial is in the OFF position, the external
temperature will be displayed in °C.
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
EXP Expansion card
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
SP Hydraulic separator
IP Floor system
VM Thermostatic mixer valve
TSB Low temperature safety thermostat
ONE DIRECT ZONE system , external sensor and air thermostat.
R
M
SE
TA
Fig. 39
MULTI ZONE system - with zone valve, air thermostat and
external sensor.
TA
TZ1
VZ1 VZ2 VZ3
TZ2 TZ3
R
M
Fig. 40
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