1.4
FUNCTIONAL DIAGRAM
"25 OF" models
1
23
3
4
22
U
"25 BF" models
1
2
3
4
17
22
20
U
24
7
8
26
14
13
17
20
21
19
M
E
G
7
8
5
14
6
15
12
13
19
21
E
G
M
11
25
15
9
KEY
10
16
12
18
10 Pump
R
14 Water flow switch
16 Automatic by-pass
20 D.H.W. cock (optional)
21 Gas cock (optional)
22 Fixing jig
11
23 D.H.W. probe (SS)
24 Bithermal exchanger
25 Water pressure switch
26 Filling cock
9
10
16
18
R
1 Smoke chamber/Fan ("25 BF" model)
2 Main exchanger
3 Combustion chamber
4 Gas valve
5 D.H.W. plate exchanger
6 Divertor valve with charging
7 C.H. sensor (SM)
8 100°C safety stat
9 Air relief valve
11 Expansion vessel
12 Safety valve
13 Boiler discharge
15 Hydrometer
17 D.H.W. filter
18 C.H. return cock (optional)
19 C.H. flow cock (optional)
IT
ES
PT
GB
GR
RO
RUS
Fig. 2
69