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1. Air pressure switch 2. Safety thermostat 3. Main
exchanger 4. Combustion chamber
5. Combustion chamber cover
6. Motorized 3 way valve 7. Central
heating NTC sensor 8. Safety
valve 9. Domestic hot water NTC sensor
10. Domestic hot water flow switch |
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11. Pressure safety switch 12. Circulation
pump 13. Gas valve 14. Expansion
vessel 15. Burner 16. Ground
electrode 17. Ignition electrode
18. Fan 19. Flue gas safety thermostat
20. Flue gas cell 21. Secondary heat
exchanger |