FAULT FINDING
& DIAGRAMS
INSTALLATION & SERVICING INSTRUCTIONS
45
ELECTRICAL WIRING DIAGRAM
6-720-611-730b (12.05)
1. Terminal block, 230VAC mains supply.
2. Roomstat link.
3. Earth connection.
4. Fuse, slow 2.5A.
5. Transformer.
6. Master switch.
7. Indicator lamp for power supply.
8. Ignition transformer.
8.1. Ignition electrode.
9. 'Chimney sweep' button.
10. Reset button.
11. Digital display.
12. Service button.
13. 'ECO' indicator.
14. Indicator lamp for burner.
15. Connector for timer.
16. Motor, 3 way valve,
Pin 1 = blue, Pin 2 = violet, Pin 3 = yellow.
17. Hot water NTCsensor,
Pin 17 = yellow, Pin 18 = yellow.
18. Condensate end switch,
Pin 11 = blue, Pin 12 = blue.
19. Tank NTCsensor,
Pin 9 = pink, Pin 10 = pink.
20. Heat bank overheat stat,
Pin 7 = white, Pin 8 = white.
21. Flow turbine,
Pin 16 = black, Pin 19 = red, Pin 20 = yellow.
22. Central heating NTCsensor,
Pin 12 = red, Pin 13 = red.
23. Flame sensing electrode,
Pin 11 = blue.
24. Flue gas temp limiter,
Pin 6 = orange.
25. Heatex temp limiter,
Pin 5 = green.
26. Under floor module,
Pin 3 = black, Pin 4 = red.
27. Fan & condensate pump 230 VAC.
28. Solenoid valve 1,
Pin 7 = brown, Pin 8 = brown.
29. Solenoid valve 2,
Pin 9 = violet, Pin 10 = violet.
30. Connector for programmer.
31. Code plug.
32. Diagnostic interface.
33. Terminal block for programmer.
34. Fuse, slow T1.6 A.
35. Fuse, slow T0.5 A.
36. 230 VAC hot water (time switch)
37. Temperature control for central heating.
38. Temperature control for hot water.
39. Circulating pump.
40. Connector ST17.
41. Connector ST16.
ELECTRICAL WIRING DIAGRAM
7
8.1
91011121314
22
37 38
34
8
8
5
3
1
35
Mains Supply
29
28
4
39
33
27
26
32
25 24
31
30
41
40
15
16
17
23 21 20 19 18
36
PIN 13
PI N 20
41. connector ST16
2
6
40. connector ST17
PIN 1
PIN 1
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