72
1
2
3
4
22
5
7
8
27
11
14
10
9
6
16
12
18
28
13
19
21
20
17
U
E
G
M
R
Fig. 2
1
23
3
4
22
14
26
17
20
21
13
19
18
12
16
9
10
15
25
7
8
24
11
U
E
G
M
R
KEY
1 Smoke chamber/Fan (
“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
10 Pump
11 Expansion vessel
12 Safety valve
13 Boiler discharge
14 Water flow switch
15 Thermomanometer
16 Automatic by-pass
17 D.H.W. filter
18 C.H. return cock (optional)
19 C.H. flow cock (optional)
20 D.H.W. cock (optional)
21 Gas cock (optional)
22 Fixing jig
23 D.H.W. probe (SS)
24 Bithermal exchanger
25 Water pressure switch
26 Filling cock
27 Thermostat probe
28 Hydrometer
1.4
FUNCTIONAL DIAGRAM
“25 OF” model
“25 BF - 30 BF” model
