GE JSP38 Use And Care Manual page 13

Pots that extend beyond 1 inch of the surface unit
circle are not recommended for most surface cooking.
However, when canning with water-bath or pressure
canner, larger-diameter pots may be used. This is
because boiling water temperatures (even under
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surrounding the surface units.
Observe the Following Points in Canning
1. Be sure the canner fits over the center of the
surface unit. If your cooktop or its location
does not allow the canner to be centered on the
surface unit, use smaller diameter pots for good
canning results.
2. Flat-bottomed canners must be used. Do not use
canners with flanged or rippled bottoms (often
found in enamelware) because they don't make
enough contact with the surface units and take
too long to boil water.
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Flat-bottomed canners are recommended.
CAUTION:
Safe canning requires that harmful micro-
organisms are destroyed and that the jars are
sealed completely. When canning foods in a water-
bath canner, a gentle but steady boil must be
maintained for the required time. When canning
foods in a pressure canner, the pressure must be
maintained for the required time.
After you have adjusted the controls, it is
very important to make sure the prescribed
boil or pressure levels are maintained for the
required time.
HOWEVER, DO NOT USE LARGE DIAMETER
CANNERS OR OTHER LARGE DIAMETER POTS
FOR FRYING OR BOILING FOODS OTHER
THAN WATER. Most syrup or sauce mixtures—and
all types of frying—cook at temperatures much higher
than boiling water. Such temperatures could
eventually harm the glass cooktop surfaces.
3. When canning, use recipes and procedures from
reputable sources. Reliable recipes and procedures
are available from the manufacturer of your canner;
manufacturers of glass jars for canning, such as
Ball and Kerr; and the United States Department of
Agriculture Exteilsion Service.
4. Remember that canning is a process that generates
large amounts of steam. To avoid burns from steam
or heat, be careful when canning.
NOTE: If your house has low voltage, canning may
take longer than expected, even though directions
have been carefully followed. The process time will
be shortened by:
(1) using a pressure canner, and
(.2) starting with HOT tap water for fastest heating
of large quantities of water.
The cooktop surface units have temperature
limiters that prevent the glass cooktop from getting
too hot. If the bottom of your canner is not flat, the
surface unit can overheat, triggering the
temperature limiters to turn the unit off for a time.
This will stop the boil or reduce the pressure in
the canner.
Since you must make sure to process the canning
jars for the prescribed time, with no interruption
in processing time, you cannot can on any of
the cooktop surface units if your canner is not
flat enough.
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