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17. REPLACEMENT OF PARTS
WARNING: Disconnect the electrical supply at the mains and turn
off the gas service cock before commencing any further work.
After replacement of components, check for gas soundness and
carry out the functional checks as described in Section 14-Com-
missioning the Appliance.
COMPONENT ACCESS
To replace appliance parts it is necessary to remove one or more
sections of the cabinet and cover plates within the appliance as
described below_
(a)
Cabinet Top Panel
Snatch squarely upwards to release the clips.
(b) Cabinet Front Panel
Pull firmly at the base to release the clips and lift upwards and
out
(c)
Facia Panel
Remove the six pozi-drive screws and the plug-in terminal strip
connection. See Fig. 12. Remove the remaining screw in the
right hand side panel to allow the removal of the facia.
(d) Control Box and Facia
Remove the cabinet top and front panels. Release the three
pozi-drive screws and rest the assembly on the appliance. See
Fig. 12. Release the remaining screw in the right hand side
panel to allow the removal of the control box and facia.
(e)
Boiler Inner Casing Cover
Remove the six slotted hexagon head screws and washers. See
Fig. 23.
(f)
Combustion Chamber Panel
Remove the six slotted hexagon head screws.
(g)
Cabinet Lower Front Panel
Remove the five pozi-drive screws securing the panel. See
Fig. 12.
(h) Control Box Cover
Remove the five pozi-drive screws. See Fig. 12.
(i)
Control Box
Remove the facia panel. Remove the single pozi-drive screw in
the top of the left hand side panel. See Fig. 1 2. Support the box
so that undue strain is not placed upon the electrical cable and
thermostat capillaries.
(j)
Left Hand and Right Hand Cabinet Side Panels
Remove the cabinet top, front and lower front panels and the
control box and facia. Remove the three screws remaining at
the top of each of the panels, one in the left hand and two in the
right hand panel. See Fig. 12. Draw the panels slightly forward
to release them from the securing lugs in the b_ase plate and lift
away from the appliance.
COMPONENT LOCATION
The following components can be replaced if the cabinet top panel,
cabinet front panel, inner casing and combustion chamber cover
are removed. See 1 7(a), (b), (e) and (f) preceding.
1:
Main Burner
2:
Main Burner Injector
3:
Lint Arrestor Assembly
4:
Pilot Injector
5:
Spark Electrode
6:
Pilot Shield
7:
Pilot Burner
8:
Thermocouple
9:
Electrode Lead
1
0: Combustion Chamber Insulation.
The following components can be replaced if the cabinet front panel
is removed. See 17(b) preceding.
11 :
Piezo Generator
1 2: Pressure Gauge
18
The following components can be replaced if the cabinet front
panel, lower front panel and the inner casing are removed. See
17(b), (e) and (g) preceding.
Check that the electrical supply and the gas service cock are shut
off.
1 3: Domestic Hot Water Pump
14: Gas Valve
1 5: Pilot Filter
16: Sealed System Expansion Vessel.
The following components can be replaced if the cabinet top panel,
front panel and inner casing are removed. See 17(a), (b) and (e)
preceding.
1 7: Overheat Thermostat
The following components can be replaced if the cabinet top panel,
cabinet front panel, facia and the control box cover are removed.
See 17(a), (b), (c) and (h) preceding.
Check that the electrical supply has been disconnected.
19: Domestic Hot Water High Limit Thermostat
20: Central Heating Control Thermostat
21: Domestic Hot Water Control Thermostat
22: Operating Switch
23: Control Relay
24: Programmer (if fitted)
25: Suppressor
26: Pump Delay Timer Board.
The following components can be replaced if the cabinet top panel
is removed. See 17(a) preceding.
Check that the electrical supply has been disconnected.
27: Central Heating Pump
28: Flow Regulators
29: Safety Valve.
The following component can be replaced if the cabinet top panel,
cabinet front panel, control box cover, inner casing, control box and
facia and combustion chamber cover are removed. See 17(a), (b),
(d), (e), (f) and (h) preceding.
Check that the electrical supply has been disconnected.
30: Diverting Valve.
The following component can be replaced if the cabinet top panel,
cabinet front panel, control box and facia are removed. See 17(a), (b)
and (d) preceding.
31: Automatic Air Vent
The following components can be replaced if the cabinet top panel,
cabinet front panel, lower front panel, inner casing, combustion
chamber cover, control box and facia are removed. See 17(a), (b),
(d), (e), (f) and (g) preceding.
32: Heat Bank
33: Heat Exchanger.
1.
THE MAIN BURNER
Fig. 17.
(a)
Disconnect the thermocouple nut at the pilot burner assembly
and ease it from the assembly.
(b) Carefully pull the electrode lead off the connector tab at the
electrode.
(c)
Disconnect the pilot tube within the combustion chamber at
the adaptor.
(d) Release the two extended MS screws securing the burner
manifold block at the front of the chamber.
(e)
Carefully remove the burner and pilot assembly from the
combustion chamber by lifting and pulling.
(f)
Remove the pilot assembly by removing the two screws and
nuts. Remove the main injector.
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