Conventional Flue

34
Servicing Instructions - Replacing Parts
6c. Pilot Injector
6.8 Undo the pilot pipe from the gas valve and from the
underside of the pilot burner, see Diagram 16.
6.9 Remove the pipe and the injector drops out from the burner.
6d. Thermocouple
6.10 Disconnect the thermocouple from the gas valve.
6.11 Undo the thermocouple nut in the back of the pilot bracket
half a turn. This releases the thermocouple.
6.12 When replacing with a new thermocouple, take care to bend
the new component to the same shape as the thermocouple
just removed.
6.13 To ret 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.
6.14 Lock the retaining nut just enough to grip the thermocouple.
6.15 Connect the thermocouple to the valve taking care not to
over-tighten.
7. Ignition Lead
7.1 To replace the ignition lead:
7.2 Remove the ignition lead from the control box,
see Diagram 17.
17
7.3 Remove the ignition lead from the electrode, see Diagram
17, removing cable ties where necessary.
7.4 Note the direction of the lead. The new lead must follow
exactly the same route. Replace cable ties where
necessary.
NOTE: THE IGNITION LEAD MUST NOT PASS IN FRONT
OF THE CONTROL BOX AS THIS CAN DAMAGE THE
SENSITIVE ELECTRONICS.
8. Gas Valve
8.1 To remove the valve turn off the gas supply at the
isolation device.
8.2 Remove the main burner & service hatch, see Sections 4 & 5.
8.3 From inside the rebox remove the locknut from the injector,
see Section 11.
8.4 Remove the pilot feed pipe from the pilot unit, see Section 6.
8.5 It is possible to remove the entire control assembly cradle by
removing the four wing nuts inside the rebox:
- Undo the nuts on the injector pipe, thermocouple,
and pilot unit.
- Undo the four four wing nuts.
The cradle can now be withdrawn.
8.6 Alternatively it is possible to just remove the gas valve.
Remove the 2 screws at the front of the valve bracket,
see Diagrams 18.
18
Screws
8.7 Slide the bracket slightly to the right and pull forward to
access the valve connections.
8.8 Disconnect the 2 x 8mm and 1 x 4mm gas pipe ttings at the
back of the gas valve, see Diagram 19 (A).
8.9 Disconnect the thermocouple, see Diagram 19 (B).
19
A
A
B
C
8.10 Disconnect the ignition lead from the gas valve,
see Diagram 19 (C).
8.11 Remove the cover, see Section 7.3.