CATALYTIC CONVERTER (continued)
Position gas sample probe directly over the catalyst via the outlet louvre, in the centre of the
upper firebox. Ignite the fire as per the operating instructions, and run at high setting for 15
minutes. 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 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 the catalytic converter, remove the hood and front fret, then the glass panel. The cat-
alytic converter retaining clamp is secured with 4 nuts and slip proof washers, located on the
inside of the firebox, at the top, remove these nuts and the clamp can be removed. Withdraw the
clamp, followed by the catalytic converter and its seals from the firebox and discard.
Refit a new catalytic converter and seals in reverse order.
TESTING FOR FIREBOX LEAKAGE
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 con-
verter 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 and cat-
alytic converter. 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 around the door. It is important to note that the appli-
ance can never be expected to be 100% smoke tight and small quantities of smoke may be seen
in corners of joints and mating faces etc without affecting safety when the fire is actually in oper-
ation.
13
13.4
13.5
CO (%)
CO2 (%) = ratio
Summary of Contents for P30G FXL01
Page 2: ...FXL01...
