16
221785B
Diagram 8.8
FLUE BLOCKAGE
SAFETY DEVICE
ELECTRICAL
CONNECTIONS
5315
SECURING
SCREW (2)
PHIAL
SAFETY
DEVICE
LOCKNUT
Disconnect the pilot supply tube by unscrewing the tubing nut.
Remove the pilot burner by unscrewing the fixing at the left hand
side.
Reassembly Note: When refitting check that the spark gap is
correct and ensure that the thermocouple tip will be enveloped
as shown in diagram 6.3.
8.11 Thermostat
Gain access as Section 8.1. Refer to diagram 5.2, 8.5, 8.6 and
8.7.
Remove and temporarily support the electrical control box as
described in Section 5.1.
Remove the control knob. Remove the two electrical connections
from the thermostat body.
Release the thermostat body by unscrewing the two screws in
the front of the control box.
Remove the split pin. Withdraw the retaining angle and
thermostat phial from its pocket.
Remove the thermostat from the boiler.
Re-assembly note: When fitting the thermostat, make sure that
the thermostat is fully inserted into the phial pocket and then
insert the retaining angle. Replace the split pin.
Remake electrical connections.
Make sure that the capillary is positioned as before so that it
passes through the cut out in the control box, see diagram 8.5,
and that any excess being coiled up tidily at the rear of the
control box. There must be no kinks or sharp bends in the
capillary.
8.12 Peizo Unit
Gain access as Section 8.1. Refer to diagram 8.7.
Remove the electrical control box, refer to Section 5.1.
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,
refer to Section 8.11.
Depress the retaining tabs and remove the Piezo unit.
8.13 Ignition Lead
Gain access as Sections 8.1 and 5.1.
Disconnect the lead at both ends and remove.
Re-assembly note: When replacing make sure the black end of
the lead is attached to the piezo unit.
8 Servicing and Replacement of Parts
THERMOSTAT
CAPILLARY
PHIAL
RETAINING
ANGLE
PHIAL
POCKET
RETAINING
SPLIT PIN
SECURING THE
THERMOSTAT PHIAL
Diagram 8.6
2171
8.14 Flue Blockage Safety Device
Gain access as Section 8.1.
Remove the flue cleaning door, refer diagram 4.6.
Unscrew the two securing nuts and withdraw the phial assembly,
see diagram 8.8.
Remove capillary from clips.
Remove the electrical connections from the safety device.
Remove the locknut securing the safety device to the bracket
and withdraw the safety device.
PIEZO UNIT
Diagram 8.7
8039
PIEZO
UNIT
CONTROL
BOX
CAPILLARY
