20
Rubinetto di carico
impianto
fig. 22
Installation info
fig. 23
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 che-
ck that the automatic air vent in the boiler
is functioning;
-
gradually open the special water inlet tap
and check operation of any automatic air
vents installed 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 vents;
-
after switching on the boiler and after the
system has reached the correct tempera-
ture, stop the pump and repeat the air re-
lief operations;
-
let the system cool down and then adjust
the water pressure to 0.8/1 bar.
WARNING
To optimise the efficiency and safety of
heating systems used for domestic pur-
poses, to keep them in good working or-
der over time, to ensure long-lasting effi-
cient functioning also of ancillary equip-
ment and to minimise energy consump-
tion, thus complying with relative standar-
ds and laws, it is essential to treat the
water using specific products compatible
with multimetal systems.
WARNING
The low water level safety pressure switch
does not give electrical impulse to the burner
to ignite when the pressure is lower than 0.4/
0.6 bar. The pressure of the water in the hea-
ting system must not be lower than 0.8/1bar;
if this value is lower use the water inlet tap on
the boiler to adjust the pressure.
This must be performed when the system is
cold. Use the temperature and pressure gau-
ge on the boiler to read the pressure value of
the circuit.
NB:
After a given period of inactivity
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 en-
gine, in sert 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 re-
placing the cover of the boiler dry any wet
surfaces.
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)
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
