4
TECHNICAL INFORMATION
9
4.1
Overview
15
26
25
23
24
20
22
16
31
21
27
17
30
28
18
19
14
29
32
Fig. 4.1
10 Condensate drain pipe
11 C.h. return valve
12 Gas inlet valve
13 C.h. flow valve
14 Condensate trap
15 Main circuit drain valve
16 Automatic air purger valve
17 Pump
18 Pump vent plug
19 Modulation gas valve
20 Primary circuit flow switch
21 C.h. temperature probe NTC
22 Flame---detecting electrode
23 Ignition electrodes
24 Burner
25 Combustion chamber
26 Primary heat exchanger
27 Fan
28 Air switch pressure test points
29 Flue temperature probe NTC
30 Air pressure switch
31 Condensing heat exchanger
32 Safety thermostat
33 C.h. pressure relief valve
34 Modulation operator
35 Gas valve outlet pressure test point
36 Gas valve inlet pressure test point
37 C.h. expansion tank
38 By---pass valve
39 Venturi device
40 Flue outlet pipe
41 Air intake pipe
IN
ST
A
LL
ATION