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Hearthstone Quality Home Heating Products, Inc
®
Craftsbury (Model 8392)
30
catalysts off with a narrow soft-bristle brush,
or vacuum with a crevice tool.
6. If fly ash exists, or if there are suspected
catalyst performance issues, fully remove the
catalysts by gently pulling upwards from the
ribs in the cast iron, and then pulling
outwards through the catalyst access
opening.
7. Remove any remaining gasket material from
the opening and from the catalysts. Newer
generations of stoves may not use a catalyst
gasket.
8. Inspect the catalysts for any fly ash or
clogging, and remove with a soft bristled
brush or vacuum crevice tool. If extra
cleaning is needed, follow the guidelines
below:
-You may use compressed air under 35
psi, air only, no chemicals.
-You may soak the catalysts in a hot water
mix (not boiling), 4 parts water, 1 part
vinegar. Rinse with cold water until
vinegar smell is mostly gone.
-No metal tools such as gun cleaners
should be used.
-No detergents or chemicals.
9. Some warping or bowing of the catalysts over
time is acceptable, as long as the catalyst
gasket continues to seal. Measure the
catalysts in the middle section
– if the
dimensions are outside the range shown in
Figure 21, replace the catalysts.
10. Depending on the generation of your stove,
re-gasketing the catalyst may not be
necessary. If there was gasket material on
the catalyst when you removed them, they
will need to be re-gasketed during the
installation. Beginning at one corner, re-install
fiberglass gasket material on the catalysts.
11. Wrap the gasket tape around the catalysts so it is
reasonably tight. Double layer the material on
three sides of the individual catalyst cartridges as
shown in the following picture.
12. Once the gasket is installed on the catalysts,
gently push the catalysts into the catalyst
opening until the catalysts hit against the
back wall of the cavity. Take care to ensure
the gasket is not damaged and position the
two cartridges so that the single layer gasket
edges touch one another in the center.
Replace the catalyst access door.
Figure 21 - Acceptable Catalytic Distortion