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10.3 CATALYSTS
10.4 TESTING FOR FIREBOX LEAKAGE
10.1 SERVICING THE BURNER UNIT AND GAS ASSEMBLY
GB IE
Firstly, remove the decorative casting assembly as described in section 7.1. Remove the control handle, and disconnect the gas connec-
tion inside appliance. The gas connections to the gas valve can now be released. Undo the two screws retaining the burner support
brackets to the left and right hand side 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 restrictor elbow 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 dis-
connecting 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 prop-
er operation.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO MAKE THE PILOT STAY ALIGHT.
Modifications are dan-
gerous 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
thermocouple needs replacement.
The gas valve is a non-serviceable item. If this needs replacement, remove securing screws holding the valve in place, remove all pipe
unions, electrode lead, thermocouple lead and then the complete valve. Replacement must be original manufacturers parts. Re-assembly
is the reverse of removal. Ensure setting pressures are as stated in Section 2; Appliance Data.
10.2 PILOT ASSEMBLY
Remove the burner unit as detailed in section 8.1, then remove the lint arrestor and pilot unit by using a 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. 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 spec-
ifications for gap setting in section 8.1.
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 dan-
gerous and can have a serious unseen effect on safety and therefore MUST not be done. Replacements must be original manufacturers
parts. Re-assembly is the reverse of removal. Ensure setting pressures are as stated in Section 2; Appliance Data.
It is recommended that the catalysts are inspected for signs of damage and dirt during routine servicing procedures. The expected life
of the catalysts is in excess of 11,000 hours (10 years of normal use). After this time the catalysts should be replaced.
If there are any deposits of dirt or soot on the catalyst they should be cleaned with a soft brush and a vacuum cleaner. The perform-
ance of the catalysts may be checked using a combustion gas analyser as follows. Any analyser used should conform to EN 50379-3. Ignite
the fire as per the operating instructions, and run at maximum setting for 15 minutes. Position gas sample probe directly over the cata-
lysts via the outlet grille, on top of the appliance. Record the carbon 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 diox-
ide (CO2) concentrations in percentage (%) terms and carbon monoxide concentration in parts per million (ppm) terms. The reading
will be more accurate if the CO2 is greater than 1%.
In order to calculate the combustion ratio for the appliance (CO/CO2) it is first necessary to express both gas concentrations in terms
of percentage. To convert from parts per million (ppm) to a percentage (%) divide the ppm figure by 10,000. Examples : 35ppm = 0.0035%,
15ppm = 0.0015%, 5ppm = 0.0005%. Now divide the concentration of carbon monoxide (CO) expressed in percent by the concentra-
tion of carbon dioxide (CO2) to obtain the appliance combustion ratio.
The combustion ratio of the gasses emitted by the catalytic convertor should not exceed 0.0015.
If replacing, firstly, remove the decorative castings (as described in section 7.1) and outer casing. The catalysts are located on the top of
the internal firebox and can be removed by unscrewing the retaining nuts securing the clamping plates. Refit the new catalysts and seals
in reverse order, ensure the catalysts and the glass door have good seals.
Appliances that are several years old or have been extensively dismantled should be checked for soundness. It is important that all the
products of combustion pass through the catalytic converter at the top of the firebox before leaving the appliance. The firebox is heat-
ed by lighting for a few minutes to provide a flow through the firebox. The burner is then shut off and a smoke pellet or match intro-
duced at the base of the fire underneath the burner tray. Large quantities of smoke will emerge from the top of the appliance, but none
should emerge from the joints or gasket faces, especially around the door. It is important to note that the appliance can never be expect-
ed to be 100% smoke tight and small quantities of smoke may be seen in corners of joints and gasket faces etc without affecting safety
when the fire is in operation.
CO (%)
CO2 (%)
= ratio
© 2014 Focal Point Fires plc.
