28
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°C
0
1
2
3
4
5
6
7
8
9
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.
