SERVICING (continued)
13. Check the purpose provided ventilation is un-obstructed.
14. Light the fire and test setting pressures.
15. Check safe operation of the appliance.
For specific servicing instructions, see relevant sections.
SERVICING THE BURNER UNIT AND GAS ASSEMBLY
Firstly, remove the decorative facia assembly (removal is the reverse of fitting as described in section 8.4).
Remove the inner glass panel, and disconnect the gas connection inside appliance. The gas connections to the
gas valve can now be released. Detach the burner front cover plate by removal of the four retaining screws.
Undo the four screws retaining the burner support brackets to the base and rear of the firebox, and remove the
control knob and spindle assembly by removal of the spindle retaining clip. 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 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 thermocouple needs replacement.
The gas valve is a non-serviceable item. If this needs replacement, remove M4 securing screw 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 stat-
ed in Section 2; Appliance Data.
PILOT ASSEMBLY
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 span-
ners 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 specifications 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 dan-
gerous 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.
CATALYST
It is recommended that the catalysts are inspected for signs of damage and dirt during routine servicing proce-
dures. 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. 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 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 catalysts 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 dioxide (CO2) concentrations in percentage (%) terms and carbon monoxide concentration in parts
per million (ppm) terms. 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 monox-
ide (CO) expressed in percent by the concentration 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 frame/glass facia as described in section 8.4. The catalysts are located on the top of the
internal firebox and can be removed be unscrewing the retaining nuts securing the clamping plates. Remove the catalysts their
seals and discard. Refit the new catalysts and seals in reverse order, ensure the catalysts and the glass door have good seals.
8
10.1
10.3
10.2
10.0
©
2008 Focal Point Fires plc.
CO (%)
CO2 (%) = ratio
