Technical data

INSTALLATION & SERVICING INSTRUCTIONS
9.1.1 Removal of Outer Casing (see Figure 13)
Remove the control cover by pulling forward. Remove the main casing locating screws. Gently pull
casing forward to remove. On replacement, check that the clips for the thermostat capillary are not
dislodged.
9.1.2 Removal of Combustion Chamber Door ( see
Figure 13)
a Remove the split pin from the thermostat phial pocket. Remove the fixing screws for the thermostat
pocket cover, leaving the cover on the capillary.
b Remove eight screws and remove door.
9.1.3 Removal of Main Burner (see
Figure 13)
a Slacken the two screws through the sealing gasket at the front of the base of the boiler.
b Unscrew the thermocouple nut at the base of the pilot assembly, releasing the thermocouple,
withdraw nut.
c Unscrew the electrode nut at the base of the pilot assembly, remove electrode.
d Unscrew the pilot tube nut at the base of the pilot assembly, releasing the pilot tube.
e Remove the two brass screws securing the pilot assembly to the main burner, lift away the complete
pilot assembly. Note that the pilot injector is loosely attached to the olive on the pilot tube.
f Remove the fixing screws securing the main burner to the base of the boiler. Remove the main
burner by pulling forward and tilting upward, taking care not to damage the thermocouple or pilot tube.
g Inspect the burner and lightly brush off any deposits.
9.1.4 Inspect the Main and Pilot Injectors
If these require cleaning, use water or air. Do not use a pin or wire.
Page 21
9.1.5 Inspect the Thermocouple
If the thermocouple tip is burnt away or cracked, replace the thermocouple (see
Section 9.2) 9.1.6
Inspect the Electrode
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