Features and technical data
10
1
Figure 1.6
55.1 boiler hydraulic diagram
1
Flue safety thermal fuse
2
Heat exchanger
3
Burner unit
4
Flame detector
5
Heating return probe
6
Blower
7
Modulating circulator
8
Gas valve
9
Air vent valve
10 System drain tap
11 Heating delivery probe
12 Safety thermostat
13 Ignition electrode
14 Air intake pipe
15 Ignition transformer
16 Venturi
17 Safety valve
18 Water pressure switch
19 System drain tap
20 Condensate drain siphon
21 INAIL approved manual reset lock thermostat
22 INAIL approved thermometer
23 INAIL approved minimum pressure lock switch
24 INAIL approved maximum pressure lock switch
25 Pressure gauge connection tap with test flange
and shock absorber pipe
26 INAIL-compliant pressure gauge
27 System delivery connection
28 System return connection
29 INAIL approved safety valve
30 Expansion tank
31 Gas shut-off valve sensing bulb thermowell
32 Inspection well
33 In-line shut-off valve
A
Heating outlet
B
Condensate discharge
C
Gas
D
Heating return
PB
TB
PM
30
14
12
11
9
13
15
16
6
20
1
3
21
18
29
22
21
26
25
23
24
31
32
33
27
28
33
10
5
7
19
6
4
2
17
8
D
C
A
B