10
SSEER
RV
VIIC
CIIN
NG
G TTH
HEE B
BU
UR
RN
NEER
R U
UN
NIITT A
AN
ND
D G
GA
ASS A
ASSSSEEM
MB
BLLY
Y
Firstly, remove the decorative frame assembly per the reverse of section 8.4, the glass panel, and disconnect the
gas connection inside appliance. The gas connections to the gas valve can now be released. Detatch the burn-
er 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 removale 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. N
NEEV
VEER
R M
MO
OD
DIIFFYY O
OR
R BBEEN
ND
D TTH
HEE TTH
HEER
RM
MO
OC
CO
OU
UPPLLEE TTO
O M
MA
AK
KEE TTH
HEE PPIILLO
OTT
SSTTA
AYY A
ALLIIG
GH
HTT. 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-assemble in the reverse of removal. Ensure setting pressures are as stat-
ed in Section 2; Appliance Data.
PPIILLO
OTT A
ASSSSEEM
MB
BLLY
Y
Remove the casing, internal firebox (as per servicing section), lint arrestor and pilot unit by using a long screw-
driver 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 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.
N
NEEV
VEER
R M
MO
OD
DIIFFYY O
OR
R BBEEN
ND
D TTH
HEE TTH
HEER
RM
MO
OC
CO
OU
UPPLLEE TTO
O M
MA
AK
KEE TTH
HEE PPIILLO
OTT SSTTA
AYY A
ALLIIG
GH
HTT. 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.
C
CA
ATTA
ALLY
YSSTT
It is recommended that the catalyst is inspected for signs of damage and dirt during routine servicing proce-
dures. The expected life of the catalyst 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 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 catalyst may be checked using a combustion gas analyser as follows. Any analyser used
should conform to BS7927 : 1998 + A1 : 1999.
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 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%.
88
1100..22
1100..33
1100..11
