SERVICING THE BURNER TRAY AND GAS ASSEMBLY
Firstly, remove the front facia (removal is the reverse of fitting as detailed in section 8.4), the glass
panel, and disconnect the gas connection inside the appliance. The gas connections to the gas valve
can now be released. Undo the four screws retaining the burner support brackets to the base and rear
of the firebox. The burner may now be removed.
Remove the pilot and main burner pipes and blow through to dislodge any debris. Now remove the
injector elbow (where fitted) and blow through to make sure it is entirely clear.
Unclip the pilot lint gauze and clean with a soft brush. Clean the exterior of the pilot assembly with a
soft brush and blow through the flame ports on the pilot head. Check the aeration holes are free from
lint or dirt. The pilot assembly can be removed if required by disconnecting the electrode HT lead, gas
pipe and unscrewing the mounting screws and lifting away.
The pilot assembly is a non-serviceable item and should not be taken apart. Aeration holes must be
absolutely clear internally for proper operation.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO
MAKE THE PILOT STAY ALIGHT
. Modifications are dangerous and can have serious unseen effects
on safety. If the pilot will not stay lit there is a problem with dirt, the gas supply to it, or the thermo-
couple needs replacement.
The gas valve is a non-serviceable item. If this needs replacement, remove the M4 securing screw hold-
ing the valve bracket in place, remove all pipe unions, and the complete valve. Replacement must be
original manufacturers parts.
Re-assemble in the reverse of removal. Ensure setting pressures are as stated in Section 2; Appliance
Data.
PILOT ASSEMBLY
Remove the casing, internal firebox (as per servicing section), lint arrestor (if fitted) and pilot unit by
using a long screwdriver to remove the retaining screws.
Clean the pilot assembly with a soft brush and blow through. Check the aeration holes are free of any
dirt or lint. Clean thoroughly internally, the connection can be removed from the base of the pilot unit
using two spanners to make cleaning easier. Do not damage or try to dismantle the pilot injector.
The unit is factory set and the only check necessary is to ensure the spark gap is correct. See speci-
fications for gas setting.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO MAKE THE PILOT STAY ALIGHT
. If the pilot
will not stay lit there is a problem with dirt, the gas supply, or the thermocouple needs replacement.
Modifications are dangerous and can have a serious unseen effect on safety and therefore MUST not be
done. Replacements must be original manufacturers parts. Re-assemble in the reverse of removal.
Ensure setting pressures are as stated in Section 2; Appliance Data.
CATALYSTS
It is recommended that the catalysts are inspected for signs of damage and dirt during routine servic-
ing procedures. The expected life of the catalysts is in excess of 11,000 hours (10 years of normal use).
After this time the catalyst should be replaced.
If there are any deposits of dirt or soot on the catalysts they should be cleaned with a soft brush and
a vacuum cleaner. If removed for cleaning ensure the seals are in good condition before replacing the
catalyst. New seals will usually be required.
The performance of the catalyst may be checked using a combustion gas analyser as follows. Any
analyser used should conform to BS7927 : 1998 + A1 : 1999. A suitable analyser is a Telegan Sprint
2000 XT Combustion Flue Gas Analyser.
Important: The temperature of the gases emitted from the catalytic converters is in excess
of 350
°
C. Measuring gas of this temperature may damage some types of gas analysers. If in
doubt consult the equipment manufacturer.
Ignite the fire as per the operating instructions, and run at maximum setting for 15 minutes. Position
gas sample probe directly over the catalyst via the outlet grille, on top of the appliance. Record the car-
bon dioxide (CO2) concentration and then the carbon monoxide (CO) concentration as displayed by the
analyser - also noting the units in which the values are expressed.
Most analysers display carbon dioxide (CO2) concentrations in percentage (%) terms and carbon
monoxide concentration in parts per million (ppm) terms.
8
10.1
10.2
10.3
