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4
TECHNICAL INFORMATION
4.1
Overview
17
18
19
43
42
41
40
39
38
37
36
35
31
30
29
Fig. 4.1
11 Condensate drain pipe
12 C.h. return valve
13 Domestic cold water inlet valve
20
21
22
23
25
24
28
27
26
14 Gas inlet valve
15 D.h.w. outlet pipe
16 C.h. flow valve
17 Fan
18 Air pressure sensor test points
19 Air pressure sensor
20 Flue temperature probe NTC
21 Condensing heat exchanger
22 Safety thermostat
23 C.h. temperature probe NTC
24 Main circuit drain valve
25 Condensate trap
26 Automatic air purger valve
27 Pump vent plug
28 Pump
29 C.h. pressure relief valve
30 D.h.w. flow switch
31 Modulation gas valve
32 Modulation operator
33 Gas valve outlet pressure test point
34 Gas valve inlet pressure test point
35 D.h.w. temperature probe NTC
36 Three--- way diverter valve
37 D.h.w. heat exchanger
38 Primary circuit pressure switch
39 Flame--- detecting electrode
40 Burner
41 Ignition electrodes
42 Combustion chamber
43 Primary heat exchanger
44 C.h. expansion tank
45 By--- pass valve
46 Fan pressure connection
47 Domestic water circuit filter
48 D.h.w. flow limiter
49 Flue outlet pipe
50 Air intake pipe
13
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