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Servicing Instructions - Page 24
2.
Remove controls cover, case door and combustion chamber
front panel as described in A. 'Preparing the Boiler for
Servicing', operations A, B and C.
3.
Disconnect the electrode lead from electrode.
4.
Unscrew the steel pilot tube from the pilot assembly. Take
care not to damage the electrode.
5.
Unscrew the two hexagonal head screws securing the pilot
and shield to the main burner and remove the pilot assembly,
be careful that the pilot injector does not fall out during this
operation.
Unscrew electrode retaining nut and withdraw the electrode.
6.
Replacement is the reverse of removal. On re-assembly
ensure that the spark gap is as illustrated in FIG. 30.
7.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instruction. Page 18.
COMBUSTION CHAMBER INSULATION
1.
Switch off the external electricity supply by switching off the
external isolating switch.
2.
Remove main burner as described in 'Preparing the Boiler for
Servicing', operations A, B, C, I, J, K, L, M.
3.
Bend back retaining tabs and replace insulation. It is
necessary to first remove the side insulation when replacing
the rear.
4.
Replacement is the reverse of removal.
5.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
FUSE, ELECTRONIC CONTROL, PRESSURE SWITCH,
BOILER THERMOSTAT, OVERHEAT THERMOSTAT, GRAVITY
HOT WATER/PUMP OVERRUN THERMOSTAT.
The following initial operations 1-3 are necessary to remove and
replace any of the above items.
1.
Switch off the external electricity supply by switching off the
external isolating switch.
2.
Remove controls cover by opening the door covering the
securing screw on the underside of the controls cover see
FIG. 14. Undo securing screw, pull controls cover forward
10mm, lower it to release it from its four side fixings and pull
forward clear of the thermostat knob.
3.
Remove control box securing screw and lower control box.
FUSE 1 amp
4.
The fuse is located on the electronic control and can be
replaced by lifting it from its holder.
5.
Replacement is the reverse of removal. Refer to
FIGS. 27, 28.
ELECTRONIC CONTROL
4.
Disconnect six way plug, two way plug and electrode lead
from the electronic control. Refer to FIGS. 27, 28.
Disconnect the flying leads of the electronic control
Supplied By www.heating spares.co Tel. 0161 620 6677
as follows:-
white wires from the control thermostat
brown wire from overheat thermostat
blue wire from boiler terminal block connection N
green/yellow wire from earth post.
5.
Release the control by lifting it from the four retaining lugs.
6.
Remove electronic control.
7.
Replacement is the reverse of removal. NOTE: Polarity of
electrical connections on thermostat is not important
8.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
PRESSURE SWITCH
4.
Remove the screw securing the pressure switch to the
bracket in the control box. Lift pressure switch from bracket.
5.
Disconnect the two plastic tubes. NOTE: the red tube is
connected to the pressure switch connection identified with a
red ring, or adjacent red spot.
6.
Disconnect the three electrical leads, white wire from terminal
No. 1, orange from terminal No. 2 and brown from terminal
No 3. Refer to FIGS. 27, 28.
7.
Replacement is the reverse of removal. Ensure that the
plastic tubes are not kinked on re-assembly.
8.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
OVERHEAT THERMOSTAT
NOTE: It is possible to sight the overheat bulb in two positions
dependent on the type of system, (see page 16 Figs. 21 A, B) for
which the methods of removal and replacement are described
separately.
4.
Remove door by undoing the two lower fixing screws and
lifting door off the two upper hinge brackets.
5.
Disconnect the two push on electrical connections from the
overheat thermostat terminals.
6.
Remove the nut securing the overheat thermostat to its
mounting bracket.
FULLY PUMPED AND SEALED SYSTEMS
7.
Noting the route taken by the capillary, remove the split pin
retaining the thermostat bulb, spacer and withdraw bulb and
spacer from its pocket. Remove the split grommet in the base
of the boiler, feed the thermostat capillary and bulb through
the hole.
8.
Replacement is the reverse of removal. Ensure the rubber
grommet in the base of the boiler makes a good seal around
the capillary. Ensure that the capillary is secure in the clips
provided. Refer to FIG. 2.
9.
Follow the full commissioning procedure as detailed in the
COMMISSIONING section of these instructions. Page 18.
24
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