29
MAIN COMPONENTS
LEGEND
1 Fumes pressure switch
2 Fan
3 Heating sensor
4 Total safety thermostat
5 Exchanger
6 Burner
7 Ignition electrodes
8 Control electrode
9 Automatic air bleed valve
10 Safety valve
11 No-water pressure switch
12 Circulator
13 Filling cock
14 Gas valve
15 Modulating coil
16 Hot water exchanger
17
Pressure-operated switching valve
18 Hot water sensor
19 Gas pressure reading point
20 Expansion tank
21 Thermohydrometer
22 Malfunction warning light
23 ON/OFF warning light
24 Lock-out warning light
25
Hot water adjustment potentiometer
26 Function selector
27
Heating adjustment potentiometer
28 Taken combustion test
XILO D 20 N MCS W TOP
Fume analysis points
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