6.0 Annual Servicing
12
6.1
Servicing the Appliance
1. For reasons of safety and economy the
appliance should be serviced annually
2. Before servicing please read Section 1.3
Important Information.
3. Turn off the gas supply and ensure that the
appliance is cold.
4. Remove the control knob by pulling forward,
then remove the case by easing upwards and
forwards until it is clear of its retaining lugs
(Fig. 14).
5. Undo the heat exchanger retaining nuts and
washers (Fig. 15) and draw the casting forwards
off the locating studs.
6. Remove the three screws holding the burner
retaining plate to the airbox and undo the
thermocouple nut from the gas tap (Fig. 16 & 19).
7. Ease the thermocouple and electrode lead
from the rubber grommet (Fig. 17).
8. Disengage the burner from the injector and pull
the electrode lead off the spark electrode
(Fig. 16).
9. Check that the insulation is undamaged.
Replace if necessary.
(F 8S & F 8ST only -
Check that the aluminium foil is undamaged.
Replace if necessary)
(Fig. 18).
10. Remove and clean the injector and sealing
washer. The injector must not be cleaned with a
needle or wire (Fig. 19). If the sealing washer is
damaged it must be replaced.
11. Check that the flue outlet tube is clear
(Fig. 18).
12. Brush away any dirt from the heat exchanger
casting. If necessary clean the viewing window.
13. With a light brush carefully remove deposits
from the spark electrode, burner flame ports and
the burner gauze (Fig. 16).
14. Replace the rope seal in the heat exchanger
casting if it is damaged in any way (Fig. 15). Also
examine the thermocouple and replace if
necessary.
15. Re-assemble the injector, washer and burner
assembly in reverse order of dismantling. Ensure
that the spark gap is correct ie. 3.5mm ± 0.5mm.
Check that the burner is horizontal and correctly
positioned on the injector with the gauze covering
the primary aeration hole.
16. Check the gas pressure at the test point on
the gas control tap. If the pressure is not within
the tolerance, (see Section 2.0 Technical Data)
the gas supply to the unit needs to be
investigated.
17. Check that the burner ignition is satisfactory.
Ensure that the thermocouple/electrode lead
grommet is correctly positioned and re-fit the heat
exchanger casting.
18. Check for gas soundness.
19. Fit the case and control knob and re-check
that the ignition is satisfactory.
Burner Retaining Plate
Injector
Thermocouple
Gas Tap
Electrode Lead
Washer
Grommet
Electrode Lead
Thermocouple
Burner Flame Ports
Spark
Electrode
Burner Gauze
Flue Outlet Tube
Insulation
Heat Exchanger Casting
Rope Seal
Outer Case
Control Knob
Fig. 14
Fig. 15
Fig. 16
Fig. 17
Fig. 18
Fig. 19
© Baxi Heating U.K. Limited 2007.
