Pilot Unit Assembly, Ignition Lead

8.PILOT UNIT ASSEMBLY

8.1The pilot assembly consists of four components which can be individually changed:

1.Pilot burner bracket

2.Pilot injector

3.Electrode

4.Thermocouple

Before commencing work on the pilot the Main Control Assembly must be removed, see Section 7 above.

•Remove the electrode, see paragraph 8.3

•Remove the thermocouple, see paragraph 8.5

•Remove the pilot pipe

•Remove the two screwed securing the bracket

The pilot burner bracket can now be removed.

•Replace in reverse order

•Check the pilot gasket and if damaged, replace with a new one

•Pull the ignition lead off the electrode and undo the retaining nut, Diagram 15

AR1349

•Replace with a new electrode. Do not over-tighten the nut; this could break the component

•Replace the ignition lead

AR1874

•Undo the pilot pipe from the gas valve and from the underside of the pilot burner, Diagram 16

•Remove the pipe and the injector drops out from the burner

•Disconnect the thermocouple from the gas valve/interrupter, Diagram 16, Arrow B

•Undo the thermocouple nut in the back of the pilot bracket half a turn. This releases the thermocouple.

When replacing with a new thermocouple, take care to bend the new component to the same shape as the thermocouple just removed.

To refit the thermocouple into the pilot bracket, ensure it is pushed fully into the hole. There is a stop on the thermocouple to set the height.

•Lock the retaining nut just enough to grip the thermocouple

•Connect the thermocouple to the valve/interrupter and take care not to over-tighten

AR1872

9.1To replace the ignition lead:

•Release the Main Control Assembly and tilt backwards, see Section 7 above

•Remove the ignition lead from the control box, Diagram

•Remove the ignition lead from the electrode, Diagram 17

Note the direction of the lead. The new lead must follow exactly the same route.

NOTE: THE IGNITION LEAD MUST NOT PASS IN FRONT OF THE CONTROL BOX AS THIS CAN DAMAGE THE SENSITIVE ELECTRONICS.