Supplied By www.heating spares.co Tel. 0161 620 6677
19
221764B
9 Replacement of Parts
9013
Diagram 9.1
REMOVAL OF GAS VALVE
PILOT ASSEMBLY
Diagram 9.2
0935
PILOT
INJECTOR
PILOT
TUBE
PILOT
BURNER
ASSEMBLY
PILOT
SHIELD
SPARK
ELECTRODE
SECURING SCREW (2)
AND NUT (2)
THERMOCOUPLE
IGNITION LEAD
(CLEAR END)
GAS
VALVE
PLUG
GAS
VALVE
GAS
OUTLET
FLANGE
SCREW
(4)
PILOT TUBE
NUT
INSULATION PANELS
Diagram 9.3
SIDE
INSULATION
PANEL
1281
SCREW
REAR
INSULATION
PANEL
CLIP
BAFFLE
TRAY
GRAPHITE
COATED NUT
Remove the nut retaining the spark electrode and remove.
Remove the two screws and nuts securing the pilot burner and
shield to the combustion chamber cover.
Hook pilot injector over pilot tube olive when refitting.
Check that the pilot flame length is as shown in
diagram 7.2.
Replace thermostat phial as Section 8.5.
9.5 Spark Electrode
Gain access to the boiler as Section 8.1.
Disconnect the thermocouple nut and withdraw thermocouple
from pilot burner, see diagram 9.2.
Disconnect the nut retaining the spark electrode and remove.
When re-assembling check that spark gap is as shown in
diagram 7.2
9.6 Insulation Panels
Gain access to the boiler as Section 8.1.
Remove the burner assembly as Section 8.2.
Remove the two screws retaining each side insulation panel
within the combustion chamber and remove panel, see diagram
9.3.
Release the rear insulation panel upper clips and lift panel out.
Refit thermostat phial as Section 8.5.
9.7 Boiler Thermostat
Follow the relevant instructions in Section 8.1.
Remove the mains inlet connector by pulling downwards, see
diagram 8.1.
Remove the retaining split pin from the phial pocket then
withdraw the phial and capillary, see diagram 4.5.
Pull off the thermostat control knob.
Gain access to inside of the control box by removing the
securing screw located at the top of control box and unhooking
at the bottom, see diagram 9.4.
Remove the two screws which secure the boiler thermostat to
the control box, see diagram 9.4.
Tilt the thermostat so that the electrical connections can be
removed.
Withdraw boiler thermostat from control box complete with
capillary tube and phial.
Refer to diagram 9.5 to connect electrical connectors.
Replace the thermostat phial as the relevant part of Section 8.5.
Make sure that the capillary is positioned so that it passes
through the cut out in the control box, see diagram 9.4.
9.8 Piezo Unit
Pull door forward at the top to disengage the studs and lift to
release from slots, see diagram 7.3.
Remove mains inlet connector by pulling downwards, see
diagram 8.1.
Gain access to inside of the control box by removing the
securing screw located at the top of control box and unhooking
at the bottom, see diagram 9.4.
Disconnect the ignition lead at the piezo unit.
Note: To ease the removal of the piezo unit it is advisable to
temporarily remove the boiler thermostat from the control box.
Depress the retaining tabs and remove the Piezo unit.
9.9 Ignition Lead
Gain access to the boiler as Section 8.1.
Disconnect the ignition lead at the piezo unit, see diagram 9.4
and section 9.8.
THERMOCOUPLE
NUT