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Installation info
Example: At 25°C, the nominal resistance is 10067 Ohm
At 90°C, the nominal resistance is 920 Ohm
Relation between the temperature (°C) and nominal resistance
(Ohm) of the heating sensor SR and D.H.W. sensor SS
TABLE OF RESISTANCE VALUES AS A FUNCTION OF THE TEMPERATURE
OF THE HEATING SENSOR (SR) AND D.H.W. SENSOR (SS) with a nominal resistance of ten kOhm
T°C0123456789
0 32755 31137 29607 28161 26795 25502 24278 23121 22025 20987
10 20003 19072 18189 17351 16557 15803 15088 14410 13765 13153
20 12571 12019 11493 10994 10519 10067 9636 9227 8837 8466
30 8112 7775 7454 7147 6855 6577 6311 6057 5815 5584
40 5363 5152 4951 4758 4574 4398 4230 4069 3915 3768
50 3627 3491 3362 3238 3119 3006 2897 2792 2692 2596
60 2504 2415 2330 2249 2171 2096 2023 1954 1888 1824
70 1762 1703 1646 1592 1539 1488 1440 1393 1348 1304
80 1263 1222 1183 1146 1110 1075 1042 1010 979 949
90 920 892 865 839 814 790 766 744 722 701
2.5 - STARTING THE
BOILER
PRELIMINARY CHECKS
Before starting the boiler check that:
- the boiler installation has been made in
accordance with all the applicable regu-
lations concerning water and gas instal-
lation, smoke evacuation and electrical
installation
- the flue gas exhaust duct and its terminal
are installed correctly: when the boiler
FILLING TAP
is switched on there must be no le-
akage of any combustion products
from any seals;
- the supply voltage of the boiler is 230 V-
50 Hz;
- the system is correctly filled with water
(pressure at the gauge 0.8/1 bar);
- any gate valves taps of the system are
open;
- the mains gas corresponds to that with
which the boiler has been calibrated:
otherwise, convert the boiler to use the
gas available (see section: “MODIFICA-
TION FOR OTHER GASES “): this ope-
ration must be performed by quali-
fied technicians;
- the gas supply tap is open;
- there are no gas leaks;
- the external mains switch is on;
- the boiler’s safety valve is not locked;
- there are no water leaks.
SWITCHING ON AND OFF
To switch on and off the boiler follow the
indications in the “Users’ Instructions”.
Filling position
fig. 26
Normal posi-
tion
FILLING TAP
2.4 -FILLING THE
SYSTEM
After completing all the connections of the
system the heating circuit can be filled.
This filling operation must be performed with
care as follows:
- open the air vents of the radiators and
check that the automatic air vent in the
boiler is works properly;
- gradually open the water tap and check
operation of any automatic air vents in-
stalled in the system;
- close the air vents on the radiators as
soon as water comes out;
- use the pressure gauge on the boiler to
check that the pressure has reached the
value of 0.8/1bar;
- close the water inlet tap and then release
the air again through the radiator air ven-
ts;
- after switching on the boiler and after the
system has reached the correct tempe-
rature, stop the pump and repeat the air
relief operations;
- let the system cool down and then adjust
the water pressure to 0.8/1 bar.
WARNING
NB: After a given period of
inactivity and without electri-
cal supply the pump could be
blocked.
Before switching on the boiler it is important
to restart the pump as follows: loosen the
protection screw in the centre of the pump
motor, insert a screwdriver in the hole and
then manually rotate the pump shaft
clockwise.
Once the pump has been restarted tighten
the protection screw and check that there
are no water leaks.
WARNING
Once the protection screw has been remo-
ved a little water may leak out. Before repla-
cing the casing of the boiler dry any wet
surfaces.
The minimum water pressure switch does
not give electrical impulse to the burner to
ignite when the pressure is lower than 0.4
bar. The pressure of the water in the C.H.
system must not be lower than 0.8/1bar; if
this value is lower use the water filling tap on
the boiler to adjust the pressure.
This must be performed when the system is
cold. Use the pressure gauge on the boiler
to read the pressure value of the circuit.
28


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