1.4
FUNCTIONAL DIAGRAM
2
3
20
S3
M2 R3 G
1.5
MAIN COMPONENTS
6
1
15
9
8
17
7
4
13
22
19
21
12
M
R
KEY
1 Fan - mixer
2 Primary exchanger
11
3 Breather valve
4 Gas valve
5 Boiler discharge
6 Limit stat
7 C.H. sensor (SM)
8 Safety stat
10
9 Air relief valve
10 Circulation pump
11 Expansion vessel system
5
12 Safety valve system
13 Motor-operated diverter valve
14
14 Water pressure transducer
15 Flowmeter
16 Automatic by-pass
17 Gas rate adjuster
18 C.H. return cock
16
19 C.H. flow cock
20 Condensation outlet
18
21 Gas cock
22 Fixing jig
R
C.H. return
M C.H. flow
G
Gas connection
S3 Condensation outlet
R3 D.H.W. tank return
M2 D.H.W. tank flow
KEY
10 Ignition electrode
11 Smoke stat
12 Automatic air vent
13 Ignition transformer
14 Expansion vessel system
15 Fan
16 Condensation outlet
17 Diverter valve
18 Circulating pump
19 Pressure transducer
20 Safety valve
1 Control panel
2 Gas valve
3 Air pressure switch
4 Water flow meter
5 C.H. sensor (SM)
6 Air pressure test point
7 Safety stat
8 Sensing electrode
9 Water-gas exchanger
ENG
FR
Fig. 2
Fig. 3
5