Installation
16
250 - 320 - 420 models
1
4
3
2
7
13
20
19
12
12
12
15
26
14
16
22
24
12
5 11 9
6 10 8
25
18
21
17
555 - 700 - 780 - 850 models
1
4
3
2
7
13
20
19
12
12
12
15
26
14
16
22
24
12
5
8
6
10
9
5
11
23
25
18
21
17
1
Hydraulic backflow preventer
2
Y-shaped filter
3
Flow switch
4
Filling unit
5
Drain funnel with articulated elbow
pipe
6
Pressure gauge
7
Condensate neutraliser (see ICI
catalogue)
8
Pressure transducer
9
Pressure gauge tap
10
Shock-absorbing pipe
11
Safety valve no.1
12
Manual shut-off valve
13
Expansion vessel
14
Level probe glow plug (optional)
15
System flow
16
Fuel shut-off valve probe
17
Water inlet for system refill or top up
18
Medium-temperature return
19
Boiler drain
20
Acid condensate outlet
21
Neutralised condensate outlet
22
Air bleed valve
23
Safety valve no. 2 (only with thermal
power above 580 kW)
24
Fuel shut-off valve
25
Low-temperature return
26
Gas inlet