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Changing Components - Page 23
8.5 Thermostat
1. Withdraw the thermostat phial from the boiler door (Fig.
61).
2. Undo the locknut retaining the thermostat to the controls
mounting bracket (Fig. 57). Ease the thermostat away from
the bracket and disconnect the electrical connections noting
their positions.
3. Reassemble in reverse order.
8.6 Piezo Igniter Unit
1. Pull the igniter lead off the piezo and undo the plastic
locknut. Remove the piezo igniter unit (Fig. 58).
2. Reassemble in reverse order.
To change the Gas Valve, Burner and Main Injector,
Electrode/Lead, and Pilot/A.S.D. Assembly proceed as
follows:-
8.7 Removal of Controls
1. Turn the boiler thermostat to “O” (Fig. 62).
2. Undo the retaining screw and remove the heat shield and
electrical plug from the socket (Fig. 60).
3. Disconnect the union at the gas service cock and remove
the fire feed pipe.
4. Remove the thermostat phial from the boiler (Fig. 61).
5. Lift and remove the injector insulation pad (Fig. 62).
6. Undo the nut on the sensing pipe at the adaptor (Fig. 61).
7. Undo the four screws retaining the door and remove the
door (Fig. 61).
8. Undo the two screws retaining the controls to the
combustion box (Fig. 62).
9. Slacken the screw holding the controls to the combustion
box base tray.
10. Withdraw the controls from the boiler.
