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3 - MAIN COMPONENTS
22 - Combustion analysis tap
23 - U1 supply temperature sensor
24 - Burner window
25 - Air/gas manifold
26 - U6 high temperature limit sensor
27 - Flue gases back fl ow preventer
28 - Fan
29 - Gas valve
30 - Heating pressure gauge
31 - Display
32 - Domestic hot water temperature control
33 - Heating temperature control
34 - On/off power switch
35 - Three way valve
36 - U3 domestic cold water temp. sensor
37 - Cable clamp
Figure 1 - Main components
38 - ASME Safety relief valve
39 - U8 return temperature sensor
40 - By-pass pipe
41 - Condensation discharge pipe
42 - Secondary heat exchanger for domestic
hot water production
43 - Expansion tank connection pipe
44 - Circulator pump screw
45 - Circulator pump
46 - Condensation discharge trap
47 - Flame-proving electrode
48 - Burner
49 - Right ignition electrode
50 - Left ignition electrode
51 - Spark generator
52 - Flue pressure switch
10
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