LEGEND:
1. Air Pressure Switch
2. Fan
3. Main Heat Exchanger
4. Main Circuit Temperature Probe (Flow
Sensor)
5. Burner
6. Detection Electrode
7. Ignition Electrode
8. Pressure Gauge
9. Safety Valve
10. Secondary Heat Exchanger
11. Gas Valve
12. D.H.W. Flow Switch
14. Boiler drain valve
15. Motorised Diverter Valve
16. Automatic By-pass
17. Circulation Pump with Automatic
Air Release Valve
18. Expansion Vessel
A. Central Heating Flow
B. Domestic Hot Water Outlet
C. Inlet Gas
D. Domestic Cold Water Inlet
E. Central Heating Return
2.12 WATER CIRCUIT DIAGRAM
FIG. 2.15
SI017A
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