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1.04 General Layout and Main Components
1
5
90
28
132
27
19
1.05 Boiler water flow diagram
Pressure loss diagram
300
200
100
90
80
70
60
50
40
30
20
10
1 = Sigma 30-40
.1
2 = Sigma 50-60
91
16
1
10
22
21
7
.2
.3
.4
.5 .6 .7 .8 .9
Water flow rate (m
Sigma
Key
1 Fixing points
5 Room sealed compartment
7 Inlet gas-cock
10 Central heating flow outlet
11 Central heating return inlet
16 Fan
19 Combustion chamber
43
21 Gas injector
49
22 Burner
34
24 Spark and sensor electrode
11
27 Cast iron heat exchanger
28 Flue collector from heat exchanger
86
34 Central heating flow
121
68
temperature sensor
43 Air pressure switch
63
44 Gas valve
49 Safety overheat thermostat
63 Central heating temperature setting
24
68 Control box with P.C.B.
83 Full sequence automatic control
83
86 Automatic control reset switch
44
90 Flue outlet pressure test point
91 Air pressure test point
151
121 Boiler shut-down warning
132 Flue gas deflector
151 Drain tap
Fig. 2
2
1
1
2
3
3
/h)
Fig. 3
Flue out
Air in
C.H.
C.H.
out
in
Gas in
5
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