42
MAIN COMPONENTS
LEGEND
1
Hot water detector
2
3-way valve
3
Instantaneous water-heater
4
Manual air purge valve
5
Ignition electrodes
6
Expansion tank
7
Fumes fan
8
Fumes pressure switch
9
Total safety thermostat
10
Manual air purge valve
11
Gas valve
12
Heating detector
13
Automatic air purge valve
14
Electronic control unit
15
Circulating pump
16
Heating safety valve
17
By-pass
18
Filling cock
19
Lack of water pressure switch
20
Reset push-button with lock-out warning light
21
Hydrometer
22
Electric box