Main Water Circuit; System Filling; Sensors; Expansion Vessel - Sime Brava Slim 25 BF Manuel Pour L'utilisation, L'installation Et L'entretien

5.6

Main water circuit

1
2
3
4
6
8
13
M U
KEY:
M System delivery
R System return
U Domestic hot water outlet
E Domesti hot water inlet
S Safety valve outlet
G Gas supply
Fan
1
Heat exchanger (mono-thermal)
2
Dual sensor (thermal safety/delivery)
3
Combustion chamber
4
Gas valve
5
Domestic hot water heat exchanger
6
Domestic hot water sensor
7
Diverter valve
8
Automatic bleed valve
9
Pump
10
Domestic hot water flow meter
11
Domestic hot water filter
12

System filling

13
System relief valve
14
Water pressure transducer
15
Boiler drain
16
System expansion vessel
17
5.7

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 temperature 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.
58
17
5
9
15
14 S
7
11
12
G E R
TR
0°C 1°C
0°C 27279 26135
10°C 17959 17245
20°C 12090 11634
30°C 8313 8016
40°C 5828 5630
4161 4026
50°C
60°C 3021 2928
70°C 2229 2164
1669 1622
80°C
90°C 1266 1232
973
100°C
5.8

Expansion vessel

The expansion vessel installed on the boilers has the following
characteristics:
10
Description
Total capacity
Prefilling pressure
Useful capacity
16
Maximum system content (*)
(*) Conditions of:
Average operating temperature 70°C (with high temperature
system 80/60°C)
Start temperature at system filling 10°C.
Fig. 11
m
CAUTION
– For systems with water content exceeding the max-
imum system content (as indicated in the table) an
additional expansion vessel must be prearranged.
– The difference in height between the relief valve and
the highest point of the system cannot exceed 6 me-
tres. If the difference is greater than 6 metres, in-
crease the prefilling pressure of the expansion vessel
and the system when cold by 0.1 bar for each meter
increase.
5.9

Circulation pump

The flow-head performance curve available for the heating sys-
tem is shown in the graph below.
RESIDUAL HEAD (mbar)
600
500
400
300
200
100
0
0 200
2°C 3°C 4°C 5°C 6°C 7°C
25044 24004 23014 22069 21168 20309
16563 15912 15289 14694 14126 13582
11199 10781 10382 9999 9633 9281
7731 7458 7196 6944 6702 6470
5440 5258 5082 4913 4751 4595
3897 3773 3653 3538 3426 3319
2839 2753 2669 2589 2512 2437
2101 2040 1982 1925 1870 1817
1577 1534 1491 1451 1411 1373
1199 1168 1137 1108 1079 1051
Brava Slim BF
U/M
25
l 8,0
kPa
bar
l 4,0
l 109
25 BF
400 600 800 1000 1200 1400
EN
8°C 9°C
19489 18706
13062 12565
8945 8622
6247 6033
4444 4300
3216 3116
2365 2296
1766 1717
1336 1300
1024 998
30 40
9,0
100
1,0
5,0
124
40 BF
30 BF
1600
FLOW (l/h)
Fig. 12