EN
1.6
Main water circuit
1
2
3
4
5
6
10
12
11
15
Sc
M
Mb
G
Rb
To be carried
out by the installer
KEY:
M System delivery
R System return
Mb Hot water tank delivery
Rb Hot water tank return
S Safety valve outlet
G Gas supply
U Domestic hot water outlet
E Domesti hot water inlet
Sc Condensate outlet
Condensing heat exchanger
1
Combustion chamber
2
Ventilator
3
Thermal safety thermostat
4
Delivery sensor
5
Pressure transducer
6
Automatic bleed valve
7
Pump
8
System expansion vessel
9
Diverter valve
10
Automatic by-pass
11
Gas valve
12
13
Boiler drain
System relief valve
14
Condensate siphon outlet
15
Storage tank
16
Magnesium anode
17
Domestic hot water sensor
18
Hot water tank drain valve
19
Domestic hot water expansion vessel
20
Hot water tank relief valve
21
Domestic hot water inlet valve
22
9
7
8
13
14
R
S
U
22
E
16
21
17
18
20
19
Fig. 3
1.7
Sensors
The sensors installed have the following characteristics:
– Dual sensor (thermal safety/output) NTC R25°C; 10kΩ
β25°-85°C: 3435
– domestic hot water sensor NTC R25°C; 10kΩ β25°-85°C:
3435
– external sensor NTC R25°C; 10kΩ β25°-85°C: 3435
Correspondence of Temperature Detected/Resistance
Examples of reading:
TR=75°C → R=1925Ω;
TR=80°C → R=1669Ω.
TR
0°C
1°C
2°C
3°C
4°C
0°C 27279
26135
25044
24004
23014
10°C
17959
17245
16563
15912
15289
20°C
12090
11634
11199
10781
10382
30°C
8313
8016
7731
7458
7196
40°C
5828
5630
5440
5258
5082
4161
4026
3897
3773
3653
50°C
60°C
3021
2928
2839
2753
2669
70°C
2229
2164
2101
2040
1982
80°C
1669
1622
1577
1534
1491
90°C
1266
1232
1199
1168
1137
973
100°C
1.8
Expansion vessel
The expansion vessel installed on the boilers has the following
characteristics:
Description
Total capacity
Prefilling pressure
Useful capacity
Maximum system content (*)
(*) Conditions of:
Average maximum temperature of the system 85°C
Start temperature at system filling 10°C.
m
CAUTION
– For systems with water content exceeding the
maximum system content (as indicated in the ta-
ble) an additional expansion vessel must be pre-
arranged.
– The difference in height between the relief valve
and the highest point of the system cannot exceed
6 metres. If the difference is greater than 6 me-
tres, increase the prefilling pressure of the expan-
sion vessel and the system when cold by 0.1 bar
for each meter increase.
5°C
6°C
7°C
8°C
9°C
22069
21168
20309
19489
18706
14694
14126
13582
13062
12565
9999
9633
9281
8945
8622
6944
6702
6470
6247
6033
4913
4751
4595
4444
4300
3538
3426
3319
3216
3116
2589
2512
2437
2365
2296
1925
1870
1817
1766
1717
1451
1411
1373
1336
1300
1108
1079
1051
1024
998
U/M
Brava Slim HE 25 T
l
9,0
kPa
100
bar
1,0
l
5,0
l
124
63