9.0 Changing Components
19
9.3
Pilot/A.S.D. Assembly
1. Undo the three retaining screws and remove
the controls assembly from the fire combustion
box (Fig. 48).
NOTE:
On refitting the controls assembly,
ensure that the tongue on the controls
mounting plate engages in the corresponding
slot in the combustion box lower panel.
NOTE:
The thermocouple cannot be changed
as an individual component. The complete
assembly must be replaced in the event of
one or other component failure(s).
2. Disconnect the electrode lead from the
electrode (Fig. 49).
3. Undo the thermocouple nut from the base of
the gas tap and disconnect the pilot feed pipe
from the tap body and pilot/A.S.D. assembly
(Figs. 49 & 50).
4. Undo the two screws holding the pilot/A.S.D.
assembly to the controls mounting plate and
remove (Fig. 49).
5. Shape the thermocouple of the replacement
pilot/A.S.D. assembly in a similar manner to the
original and fit in reverse order.
Pilot Feed Pipe
Electrode Lead
Pilot/A.S.D.
Assembly
Thermocouple Nut
Pilot Feed Pipe
Gas Tap
Controls Mounting Plate
Thermocouple
Fig. 49
Fig. 50
Controls Assembly
Fig. 48
