11
C
CA
ATTA
ALLY
YSSTT ((ccoonnttiinnuueedd))
Now divide the concentration of carbon monoxide (CO) expressed in percent by the concentration of carbon
dioxide (CO2) to obtain the appliance combustion ratio.
TThhee ccoom
mbbuussttiioonn rraattiioo ooff tthhee ggaasssseess eem
miitttteedd bbyy tthhee ccaattaallyyttiicc ccoonnvveerrttoorr sshhoouulldd nnoott eexxcceeeedd 00..00001155..
If replacing, firstly, remove the decorative fireframe as described in section 8.4. The catalyst is located on the top
of the internal firebox and can be removed be unscrewing the retaining nuts securing the clamping plate.
Remove the catalyst and its seal and discard. Refit a new catalyst and seals in reverse order, ensure the catalyst
and door have a good seals.
TTEESSTTIIN
NG
G FFO
OR
R FFIIR
REEB
BO
OXX LLEEA
AK
KA
AG
GEE
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 heated 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 introduced 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 expected to be 100% smoke tight and small quantities of smoke may be seen in corners of joints and gas-
ket faces etc without affecting safety when the fire is in operation.
TTR
RO
OU
UB
BLLEESSH
HO
OO
OTTIIN
NG
G G
GU
UIID
DEE
FFiirree ssppaarrkkss bbuutt ppiilloott ddooeess nnoott lliigghhtt
No gas to fire, check isolators are open.
Pipe work blockage, clean out.
Air not fully purged, re purge supply or wait longer.
Spark earthing to metal work, reset gap correctly.
Blocked pilot, clean out internally.
PPiilloott lliigghhttss bbuutt tthheenn ggooeess oouutt
Severe restriction in gas supply: clear obstruction.
Faulty thermocouple, replace pilot unit.
Blocked pilot, clean out.
Blocked lint gauze, clean.
Hold control knob in for longer.
Check control knob does not foul indicator plate.
If the pilot will not stay lit there is a problem with dirt, the gas sup-
ply, or the thermocouple needs replacement. Modifications are
dangerous and can have a serious unseen effect on safety.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO MAKE THE
PILOT STAY ALIGHT.
FFiirree ddooeess nnoott ssppaarrkk aatt ppiilloott
HT lead detached, refit.
Check the spark gap (see section 8.2).
Faulty piezo unit, replace.
Debris shorting out electrode, clean.
Spark shorting to metalwork under tray, realign HT lead.
FFiirree rruunnss ffoorr aa ttiim
mee aanndd tthheenn ccuuttss ooffff
Loose or faulty thermocouple, rectify.
Blocked pilot, clean out.
Dirt or lint in pilot aeration hole or on the lint gauze, clean
thoroughly.
If the pilot will not stay lit there is a problem with dirt, the gas sup-
ply, or the thermocouple needs replacement. Modifications are
dangerous and can have a serious unseen effect on safety.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO MAKE THE
PILOT STAY ALIGHT.
PPiilloott ffllaam
mee sshhrriinnkkss w
whheenn ffiirree iiss oonn hhiigghh
Poor gas flow to fire, check pressure with fire on high.
If pressure is low, remove any restriction in pipework or valve.
Check all isolators are adequately sized and fully open.
Check meter pressure is adequate.
If the pilot will not stay lit there is a problem with dirt, the gas sup-
ply, or the thermocouple needs replacement. Modifications are
dangerous and can have a serious unseen effect on safety.
NEVER MODIFY OR BEND THE THERMOCOUPLE TO MAKE THE
PILOT STAY ALIGHT.
FFiirree ssm
meellllss w
whheenn ffiirrsstt lliitt oorr iinn uussee
Newness smell from brand new appliance.
Leakage occurring. Carry out leakage test and rectify any problems.
Combustible materials used in incorrect positions.
9
1100..33
CO (%)
CO2 (%) = ratio
1100..44
1111..00
