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2.3
Hydraulic diagram
Fig. 4 Hydraulic diagram
1.
Automatic by-pass
2.
DHW temperature probe
3.
Motorised 3-way valve
4.
Modulating gas valve
5.
Safety thermostat on CH flow
6.
CH temperature probe
7.
Burner
8.
Ignition/detection electrode
9.
Mono-thermal heat exchanger
10. Sealed combustion chamber
11. Flue gas extraction fan
12. Flue gas circuit safety pressure switch
13. Pressure testing point on flue gas duct
14. Air intake and flue gas venting duct
15. Pressure testing point on flue gas duct
16. Expansion vessel
17. 3-bar safety valve
18. System unloading cock.
19. Air-purging device
20. Minimum pressure switch
21. Circulation pump
22. Filler cock
23. Cold water flow switch with filter
24. Secondary plate exchanger
13
12
11
10
9
8
7
6
5
4
3
2
1
M
C G
24
Technical features and dimensions
14
15
16
17
18
19
20
21
22
23
F R
M
CH system flow
C
DHW outlet
G
Gas inlet
F
Cold water inlet
R
CH system return
19
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