CITY 1.24 and 2.24 GN CITY 1.24 and 2.24 B/P
CITY 1.24 and 2.24 GN CITY 1.24 and 2.24 B/P
CITY 1.24 and 2.24 GN CITY 1.24 and 2.24 B/P
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3. SCHEMATICS<br />
<strong>2.24</strong> <strong>and</strong> <strong>1.24</strong> boilers<br />
1. Central heating outlet valve<br />
2. Domestic hot water outlet valve<br />
3. Gas inlet valve<br />
4. Cold water inlet valve:<br />
- water flow open / close<br />
- flowrate adjustment<br />
- filter (removable from below)<br />
5. Central heating return valve<br />
6. Drain screw<br />
7. Water flowrate sensor<br />
8. Domestic hot water outlet sensor<br />
9. Domestic hot water heat<br />
exchanger drain screw<br />
10. Domestic hot water heat exchanger<br />
maintain temperature sensor<br />
11. Domestic hot water heat<br />
exchanger air bleed screw<br />
12. Central heating / domestic hot<br />
water changeover valve drive motor<br />
13. Central heating / domestic hot<br />
water changeover valve<br />
14. Electronic pressure gauge<br />
15. Degassing chamber<br />
16. Circulator motor<br />
17. Burner pressure offtake<br />
18. Ionisation sensor<br />
19. Expansion tank<br />
20. Expansion tank inflation valve<br />
21. Automatic bleeder<br />
22. Anti-backflow draw cup-out<br />
23. Combustion product connector<br />
24. Combustion product anti-overflow<br />
sensor<br />
25. Main heat exchanger<br />
26. Central heating outlet temperature<br />
sensor<br />
27. Safety thermostat<br />
28. Combustion chamber<br />
29. Burner<br />
30. Igniter electrodes<br />
31. Gas valve modulator<br />
32. Gas valve safety valves<br />
33. Gas supply pressure offtake<br />
34. Modulator gas valve<br />
35. Domestic hot water heat<br />
exchanger (<strong>2.24</strong> only)<br />
36. Central heating circuit safety valve<br />
37. Central heating circuit by-pass pipe<br />
38. Disconnector<br />
42. Igniter<br />
43. Domestic hot water flow rate<br />
controller (10 l/min)<br />
44. Non return valve<br />
* If boiler is connected to domestic hot<br />
water storage tank<br />
24<br />
25<br />
26<br />
27<br />
28<br />
29<br />
30<br />
31<br />
32<br />
42<br />
33<br />
34<br />
35<br />
44<br />
36<br />
37<br />
38<br />
7<br />
TS<br />
TAF<br />
S1<br />
Central<br />
heating<br />
6<br />
M<br />
2<br />
1<br />
M<br />
2<br />
1<br />
S2<br />
S3<br />
6 6 6<br />
outlet<br />
1 2 3 4 5<br />
Central<br />
heating<br />
outlet<br />
D.H.W.<br />
Domestic*<br />
hot water<br />
storage tank<br />
primary outlet<br />
Gas<br />
inlet<br />
D.C.W. Central<br />
heating<br />
return<br />
gas Domestic*<br />
inlet hot water<br />
storage tank<br />
primary return<br />
Central<br />
heating<br />
return<br />
<strong>CITY</strong> <strong>2.24</strong><br />
23<br />
22<br />
21<br />
20<br />
19<br />
18<br />
17<br />
16<br />
15<br />
14<br />
13<br />
12<br />
11<br />
10<br />
43 9<br />
8<br />
7<br />
<strong>CITY</strong> <strong>1.24</strong><br />
8666N016F
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