LEGEND:
1. Fan
2. “Twin-pass” Heat Exchanger
3. Domestic Hot Water Temperature Probe
4. Burner
5. Detection Electrode
6. Ignition Electrodes
7. Gas Valve
8. Pump pressure switch
9. Safety Valve
10. D.H.W. inlet filter
11. D.H.W. Flow Switch
12. Automatic By-pass
13. Pressure Gauge
14. Circulation Pump with Automatic Air Release Valve
15. Overheat Thermostat
16. Main Circuit Temperature Probe
17. Expansion Vessel
18. Air Pressure Switch
A. Central Heating Flow
B. Domestic Hot Water Outlet
C. Gas Inlet
D. Domestic Cold Water Inlet
E. Central Heating Return
2.14 WATER CIRCUIT DIAGRAM
FIG. 2.23
SI016C
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