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REMOVAL AND REPLACEMENT OF PARTS
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Before removing appliance case, isolate
the gas and electrical supplies. Isolate
boiler from the system and drain before
removing any component in the water-
ways. Ensure that the appliance is cool.
1. Outer Case
Remove four screws in base of case and
lift free. When replacing, carefully locate
on lugs B on top edge of chassis.
5. Ignition Electrodes
Carry out steps 1 and 2 as above. remove
the wiring cover undo the power lead plug
open the electrical box 2 clips.
Dicconnect leads from spark generator on
PCB. Loosen screws securing the closure
plate and remove. Remove grommet from
base of sealed chamber. Remove screw
securing electrode bracket and lift clear
easing spade connectors through the
grommet. Reassemble in reverse order,
twisted together electrodes cable at least
10 times to avoid electrical interference.
6. Burner Assembly
Carry out steps 1,2, disconnect elec-
trodes as mentionned in section 4 and 5.
Remove two screws securing burner
assembly to the back panel of the boiler.
Lift right hand back corner first.
Reassemble in reverse order.
Carry out combustion tests utillising the
test points on the turret
7. Gas Solenoids
Disconnect colour coded leads. Remove
six screws. The solenoids are attached to
their base plate. Lift clear taking care not
to lose the three plungers and springs.
Reassemble in reverse order replacing
the cork gasket.
8. Fan Assembly
Remove outer case and sealed chamber
front panel (See Steps 1 and 2).
Disconnect spade connectors noting
positions. Remove two screws securing
the front of the fan assembly and loosen
screw on flue outlet. Twist fan assembly
anticlockwise to disengage from flue out-
let and lift clear.
Re-assemble in the reverse order ensur-
ing that the wiring is re-connected cor-
rectly and the screw on the flue outlet
tightened.
9. Flue Hood
Carry out steps 1 and 2 as above.
Remove fan assembly as in step 8.
Remove the three screws securing the
angled top of the hood to the chassis. Lift
and remove taking care not to snag the
pressure switch cables. Re-assemble in
the reverse order ensuring that the hood
is located behind the combustion cham-
ber rear panel.
2. Combustion Chamber
Unscrew four self tapping screws secur-
ing the sealed chamber front panel and lift
over top corner locating lugs. Unscrew
four self tapping screws to release com-
bustion chamber front plate and lift clear.
Reassemble in reverse order.
3. Burner Manifold
Carry out steps 1 and 2 as above.
Remove two screws securing the closure
plate and the remaining four screws to
release the manifold. Lift clear. Replace
the manifold gasket. Reassemble in
reverse order.
4. Ionisation Electrode
Carry out steps 1 and 2 as above. Loosen
screws securing the closure plate and
remove. Disconnect the lead from the
main wiring loom. Remove screw secur-
ing electrode to burner. Thread wire
through grommet and lift clear.
Reassemble in reverse order.
10. Pressure Switch
Remove outer case and sealed chamber
front panel as in steps 1 and 2.
Disconnect three pressure switch cables
noting their positions.
1 = white cable connected to NC
2 = black cable connected to NO
P = orange cable connected to C
Remove screw securing the switch brack-
et to the chassis. Disconnect the sam-
pling tubes again noting their positioning
(+ and -).
Remove switch. Reassemble in reverse
order.
11. Pressure Switch Venturi
Carry out steps 1, 2 and 8, as above.
Disconnect the sampling tubes and
remove the screw securing the venturi to
the flue outlet. Remove venturi by the bot-
tom of the 45° elbow. Reassemble in
reverse order.
12. Drain down
2 drain points are located on the boiler.
1 = DHW circuit drain point
2 = Heating circuit drain point
(Pressure releave valve)
(air separator)
1
2
13. DHW Water filter
The DHW filter is located in the DHW
command 47 Fig. 5 on the right hydraulic
assembly. Remove the clip and pull
toward you the DHW command remove
the plug and clean the filter. Reassemble
in reverse order.
14. DHW Flow switch
Disconnect the electrical connections
undo the securing clip and remove the
microswitch reassemble in reverse order.
46 Fig. 5
