Servicing Procedure - Ferroli F 24 B Instructions For Installation, Use And Maintenance Manual

tion of the thermostats, gas valve and pump.

Servicing procedure

1. Visually check boiler for correct intallation and flueing.
2. Isolate electricity supply + check fuse is 3amp.
3. Remove case by undoing the two screws located at the bottom rear corners, lift slightly and pull
forward.
4. Carry out preliminary electrical checks at boiler junction box. This is located in the centre of the boiler
at the bottom and can be accessed be the removal of a single screw. Any faults found must be rectified
before proceeding.
5. If electrical checks prove O.K. replace cover and secure with screw.
6. Attach a manometer to the boiler gas inlet test point, turn on electricty and fire boiler for hot water,
check inlet pressure. This should be 20mbar minimum for NG and 37mbar for LPG. If this is not the
case there is a supply problem and this will need to be remedied.
7. If inlet pressure is O.K. shut down boiler and remove manometer from gas inlet pressure test point
and attach it to the boiler burner pressure test point. Reseal inlet pressure test point.
8. Fire boiler for hot water and check that the maximum pressure is 11.8mbar for NG and 36.0mbar for
LPG. Turn off tap. Turn P3 on the main circuit board to minimum and fire the boiler for heating, check
that the burner pressure reads 2.5 mbar for NG and 7.8mbar for LPG. Turn P3 back to max position.
Shut down boiler, remove manometer, seal test point. If the pressures are not as specified they will
need to be adjusted on the gas valve.
10. Take off the combustion chamber cover by removing the three securing screws.
11. Lift off flue hood and flue baffle plate.
12. Pull off the ignition and flame rectification leads from their respective electrodes.
13. Undo the gas union in the centre of burner rail and take out the two securing screws. Remove the
burner rail and clean rail and injectors.
14. Remove two screws securing the burner assembly and remove the assembly. Clean burners.
15. Clean heat exchanger with a soft brush.
16. Re-assemble baffle, flue hood and fan assembly, secure with screws previously removed.
17. Refit burner assembly and burner rail.
18. Reconnect ignition and flame rectification leads.
19. Reconnect gas union and tighten.
20. Refit combustion chamber cover, secure with screws.
21. Examine seals on room sealed cover refit cover and secure with screws.
22. Turn on gas and electricity.
23. Fire boiler and check all gas joints for soundess.
24. Check flame picture and all controls for correct operation.
25. Check room sealed cover for leakage.
26. Check domestic water flow rate and temperature is within specifications.
27. Check operation of all safety cut off devices.
28. If a combustion analyser is to be used there are test points provided on the front of the room sealed
cover. The right hand grommet is for air and the left hand one is for flue gas. The boiler must reach
operating temperature before this test is carried out (normally 10-15 minutes). CO/CO2 ratio should
not exceed 0.0080. Immediately after servicing (0.0040 at any other time)
29. Refit case and secure with screws.
30. Leave boiler set to customers requirements.
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Ferroli F 24 B