Before commencing any service operation, ISOLATE the
mains electrical supply, and TURN OFF the gas supply at the
main service cock. It is the law that any service work must be
carried out by registered personnel (C.O.R.G.I.).
8.1
HEAT EXCHANGER
– Remove the fan as described in section 8.3.
– Disconnect the pressure sensing pipe from the flue box, lift
the collector hood assembly, tilt forwards, and remove the
hood.
– Isolate the C.H. flow and return valves.
– Drain the heat exchanger using the drain cock (at the bot-
tom RHS of the appliance)
– Unclip the heat exchanger securing clips, then lift out the
heat exchanger.
– Re-assemble in reverse order, ensuring that the heat
exchanger seals and clips are correctly located and that
the pressure sensing pipe is correctly re-fitted. The fan
polarity is not important except the earth conductor (G/Y
which is marked on the appliance).
– Refill, and re-commission the system as described in sec-
tion 4.
8.2
COMBUSTION CHAMBER INSULATION
The design of this appliance is such that the rear and side
insulation should not require replacement unless mechanical-
ly damaged.
IMPORTANT: When handling insulation panels, take care to
avoid producing or inhaling dust particles. When removing
old or damaged insulation panels, dampen with water to
minimise dust.
To replace the insulation front panel, proceed as follows:
– remove the combustion chamber front panel as described
in section 5.1;
– replace the front insulation panel and glue it into position
on the front panel using the glue supplied. Re-assemble in
reverse order.
Should the rear or side panels become damaged, replace
them as follows.
– remove the heat exchanger as described in section 8.1;
– remove the side insulation panels followed by the rear
panel;
– re-assemble in reverse order, refill, and recommission the
system as described in section 4.
8.3
FAN ASSEMBLY
– Remove the casing front panel and sealed chamber front
panel as described in section 5.1.
– Disconnect the electrical connections to the fan. Note the
position of the earth conductor.
– Unscrew the four screws securing the fan mounting plate.
– Drop and tilt the fan assembly forwards and remove in a
downwards direction.
– Unscrew the three screws retaining the fan on the fan
plate. Remove the fan assembly.
– Transfer the fan outlet seal onto the new fan.
– Re-assemble in reverse order. Ensure that the earth con-
nection is correctly refitted. Note that the polarity (Line
and Neutral) is immaterial.
8.4
MAIN BURNER
– Remove the main burner by following section 5.1.
– Transfer the ignition electrode onto the new burner
assembly.
– Re-assemble in reverse order. Check the electrode gaps
(fig. 27) and test for gas soundness.
– Re-commission the appliance as described in section 4.
8.5
IGNITION/DETECTION ELECTRODES
– Remove the casing front panel and sealed chamber front
panel as described in section 5.1.
– Unscrew the single screw securing the electrode in posi-
tion, and release the electrode from the burner.
Ignition electrode
:
Pull off the HT lead from the base of the electrode, and
replace the electrode.
Detection electrode
:
Follow the detection lead back to the control box. Unscrew
the two screws from the front of the control box and
remove the control box plastic front cover.
– Carefully remove the electrode and integral lead from the
appliance. Replace the electrode assembly, and carefully
route the lead through the grommet below the burner and
to the control box.
– Re-assemble in reverse order.
22
8
REPLACEMENT OF PARTS
DETECTION ELECTRODE
IGNITION ELECTRODE
25 kW
30 kW
DETECTION ELECTRODE
IGNITION ELECTRODE
Fig. 27
“Super 90 Mk.II” model
“Super 105 Mk.II” model