LEGEND:
1- Fan
2 - Burner
3 - Ignition/detection electrode
4 - Air release valve
5 - Main heat exchanger
6 - Central heating flow temperature probe
7 - Condensate Tr ap
8 - Gas valve
9 - Pressure gauge
10 - Safety valve
11 - Secondary heat exchanger
12 - Domestic hot water temperature probe
13 - Drain valve
14 - Domestic hot water flow switch
15 - Motorised valve
16 - Automatic By-pass
17 - Circulation pump with automatic
air release valve
18 - Expansion vessel
19 - Central heating return temperature probe
20 - Air pressure switch
A - Central Heating Flow
B - DHW Outlet
C - Gas Inlet
D - Cold Water Inlet
E - Central Heating Return
FIG. 2.32
27/32 MFFI (Combi)