901
7
Key
1. Fixing point
2. Flue terminal
3. Flue/air intake hood
4. Sealing gasket
5. Room sealed compartment
6. Control panel
7. Gas inlet
8. Domestic hot water outlet
9. Cold water inlet
10. Central heating flow outlet
11. Central heating return inlet
12. D.H.W. draining point
14. Central heating safety valve
16. Fan
19. Combustion - heat exchanging compartment
20. Burner assembly
21. Injector manifold
22. Burner
23. Thermocouple
24. Spark electrode
25. Pilot
26. Combustion chamber insulation
27. Copper heat exchanger for C.H. + D.H.W.
28. Flue collector from heat exchanger
29. Internal flue exit
30. Flue/surplus air collector
31. Air pressure control damper
32. Central heating pump
33. C.H. waterway of the heat exchanger
34. C.H. flow temperature sensor
35. Air separator
36. Automatic air vent
37. Cold water inlet filter
39. Cold water flow limiter
41. D.H.W. waterway of the heat exchanger
42. D.H.W. temperature sensor
43. Air pressure switch
44. Combination gas valve
45. Knob gas valve
46. Operator gas valve
47. Modulating regulator (Modureg) gas valve
48. Burner pressure test point
49. Overheat cut-off thermostat 100
°
C
50. Central heating limit thermostat 88
°
C
51. Central heating frost thermostat
53. Heat exchanger venting point
56. Expansion vessel
58. Fan air outlet pressure test point
59. Flue outlet pressure test point
60. Extended control knob to gas valve
61. C.H. selector switch
62. Time clock
63. C.H. boiler thermostat
66. Microswitch combination gas valve
67. Ignition transformer
68. Control box with P.C.B.
69. Inner flue duct
70. Outer air intake duct
71. Modulating balance tube
80. 230 V + 24 V roomstat terminal blocks
87. Venturi test point
101. P.C.B. (printed circuit board)
114. Low water pressure switch
136.Flowmeter
145. C.H. pressure gauges
158. Gas inlet pressure test point
