7
1
2
3
4
18
19
20
21
8
15
16
9
27
7 6
13
14
12
14
10
27
8
11
22
17
5
23
25
1.4
FUNCTIONAL DIAGRAM
Fig. 2
KEY
1 Fan
2 Heat exchanger
3 Combustion chamber
4 Gas valve
5 D.H.W. tank
6 C.H. sensor (SM)
7 100°C safety stat
8 Air relief valve
9 C.H. pump
10 D.H.W. pump
11 Expansion vessel
12 D.H.W. safety valve
13 C.H. safety valve
14 Boiler drain cock
15 Water pressure transducer
16 Automatic by-pass
17 D.H.W. expansion vessel
18 Gas cock
19 C.H. return cock
20 C.H. flow cock
21 D.H.W. cock
22 D.H.W. tank drain cock
23 D.H.W. sensor (SB)
24 85°C limit stat
25 Magnesium anode
27 Non return valve
1.5
MAIN COMPONENTS
Fig. 3
KEY
1 Control panel
2 Gas valve
3 C.H. pump
4 Non return valve
5 Burner
6 Water pressure transducer
7 Heat exchanger
8 85°C limit stat
9 Fan
10 Air pressure switch
11 C.H. expansion vessel
12 D.H.W. tank
13 100°C safety stat
14 C.H. sensor (SM)
15 Air relief valve
16 D.H.W. pump
17 D.H.W. expansion vessel
18 Ignition transformer
