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4.2
Main diagram
53
54
28
25
27
45
33
34
39
8
5
Fig. 4.2
3 C.h. flow valve
4 D.h.w. outlet valve
5 Gas inlet valve
6 D.c.w. inlet valve
7 C.h. return valve
8 Condensate drain pipe
9 Main circuit drain valve
21 Condensing heat exchanger air purger
valve
22 Flue temperature probe NTC
23 C.h. temperature probe NTC (delivery)
TECHNICAL INFORMATION
52
22
26
23
24
46
43
31
48
30
9
51
21
55
32
38
41
7
3
24 C.h. temperature probe NTC (return)
25 Condensing heat exchanger
26 Safety thermostat
27 Flame-detecting electrode
28 Safety thermal fuse
29 Air manifold
30 C.h. pressure relief valve
31 Automatic airpurger valve
32 Pump
33 Gas valve
34 Gas valve inlet test point
40
35
49
50
42
47
36
6
4
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