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4 - FUNCTION OVERVIEW
Key to fi gure 2:
1 = boiler
2 = automatic air vent
3 = air intake
4 = fl ue gases discharge
5 = sealed combustion chamber
6 = expansion tank
7 = burner
8 = fan
9 = gas valve
10 = condensate discharge trap
11 = circulator pump
12 = 3-way valve
13 = secondary heat exchanger for d.h.w.
14 = pressure gauge
15 = by-pass valve
17 = safety relief valve
21 = condensate discharge pipe
22 = heating supply pipe
23 = domestic hot water outlet
24 = gas inlet
25 = cold water inlet
26 = heating return pipe
45 = U7 = fl ue gas temperature sensor
46 = U1 = boiler temperature sensor
47 = U6 = high limit temperature sensor
48 = U3 = domestic cold water sensor/storage tank
sensor
49 = U2 = domestic hot water temperature sensor
50 = U8 = return temperature sensor
51 = fl ue pressure switch
Figure 2 - PC160 Hydronic functional schematic
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