10.0
Changing Components
23
10.3
Pilot/A.S.D. Assembly
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).
1. Disconnect the electrode lead from the
electrode (Fig. 72) and the motorised gas valve
leads from the control box (Fig. 71).
2. Undo the thermocouple nut from the front of
the motorised gas valve and disconnect the pilot
feed pipe from the valve and pilot/A.S.D.
assembly (Figs. 72 & 73).
3. Undo the screw holding the pilot/A.S.D.
assembly to the controls mounting plate and
remove (Fig. 72).
4. Disconnect the earth point.
5. Remove the control box heat shield retaining
screw and place the shield to one side (Fig. 70).
6. Disconnect the two thermocouple interrupter
leads at the control box (Fig. 71).
7. 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
Motorised Gas
Valve
Thermocouple
Fig. 72
Fig. 73
Fig. 71
Fig. 70
Thermocouple
Interrupter Leads
Control Box
Heat Shield
Control Box
Motorised Gas
Valve Leads
Control Box
Heat Shield
Retaining
Screw
