SERVICE
Figure 2
is noted, there are air leaks in the heat
exchanger.
Extreme caution should be used
when an electronic analyzer is used.
Never should the probe (Figure 4), of
the instrument be inserted over the fire
without checking with the manufac-
turer of the analyzer. Many probes are
not designed for this and you will more
than likely damage the probe leading to
a repair of several hundreds of dollars.
Find out from the manufacturer what is
their preferred way to do an overfire CO2
test using one of their analyzers and if
Remove the sampling tube from
the end of the sampling assembly hose
(Figure 2).
Add an extended tube to your sampling hose by use of stainless tubing or a
similar tube, to reach to the center of the
chamber. It should be at least 18 inches
to 24 inches long for most residential and
small commercial testing. Make sure the
end of the tube is well out of the fire and
almost but not quite touching the metal
over the fire, what most call the 'crown
sheet' (Figure 3).
Perform a CO2 test in the usual way.
Measure the amount of CO2 overfire,
versus what you had in the breeching.
If a noticeable amount of difference
Figure 3
Figure 4
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