Catalysts; Testing For Firebox Leakage; Cleaning - Lennox Hearth Products Radium-NG Assembly, Installation And Operation Instructions

20.0 CATALYSTS

DO NOT BLOCK THE CATALYSTS OR THE
APPLIANCE OUTLET GRILLE. BLOCKAGE MAY
CAUSE HIGH CARBON MONOXIDE LEVELS AND/OR
BREAKAGE OF THE GLASS FACIA PANEL.
Figure 7
WARNING
DO NOT OPERATE THE APPLIANCE WITH THE
CATALYST UNITS REMOVED.
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 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 analyzer as follows.
Important: The temperature of the gases emitted by the catalytic
converters is in excess of 700
may damage some types of gas analyzers. If in doubt consult the
equipment manufacturer.
Turn on the fireplace as per the operating instructions, and run at
maximum setting for 15 minutes. Position gas sample probe directly
over a 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 analyzer - also noting the units
in which the values are expressed. Most analyzers display carbon
dioxide (CO2) concentrations in percentage (%) terms and carbon
monoxide concentration in parts per million (ppm) terms.
WARNING
DO NOT BLOCK
THESE AREAS
o
F. Measuring gas of this temperature
In order to calculate the combustion ratio for the appliance (CO/CO2) it
is first necessary to express both gas concentrations in terms of per-
centage. 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 concentration of carbon dioxide (CO2) to obtain the
appliance combustion ratio.
CO (%)
CO2 (%) = ratio
The combustion ratio of the gasses emitted by the catalytic convertor
should not exceed 0.0015.
If replacing, firstly, remove the glass facia as described in section 15.0.
The catalysts are located on the top of the internal firebox and can be
removed be unscrewing the retaining nuts securing the clamping plate.
Remove the catalysts and seals and discard.
Refit a new catalysts and seals in reverse order, ensure the catalysts
and door have good seals.

21.0 TESTING FOR FIREBOX LEAKAGE

Appliances that are several years old or have been extensively disman-
tled should be checked for soundness. It is important that all the prod-
ucts of combustion pass through the catalytic converters 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 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.

22.0 CLEANING

TURN OFF THE UNVENTED GAS ROOM HEATER
AND ALLOW TO COOL BEFORE CLEANING.
GLASS PANEL -This can be cleaned with a suitable glass cleaner. The
following solutions are approved for use to clean glass.
• Non-ammonia based household cleaner
• 50% -50% mix of white vinegar and water
• Gas fireplace/stove glass cleaner
Test on a small area first.
PAINTED AREAS - These can be cleaned using a dry cloth.
FINISHED METAL AREAS - These can either be cleaned using a
proprietary metal cleaner or baby oil. Test on a small hidden part before
cleaning. Always clean in the direction of the grain.
9
WARNING