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DRYING TEMPERATURES
TEMP CONTROL & INDICATION — The drying tem-
perature within the air plenum chambers is shown by
the Temperature indicator on the ASC control panel.
Refer to Section 3 - OPERATING CONTROLS for
additional information concerning the plenum con-
troller. See Figs. 6-7 and 6-8 for ASC control panel
illustrations.
SHELLED CORN — For shelled corn with an initial
moisture content of 25-30%, the recommended
MAXIMUM drying temperature is 230-240°F for the
TOP air plenum chamber (top stage). For lower ini-
tial moisture content corn, lower drying temperatures
are recommended. Food-grade corn often requires
lower drying temperatures.
The recommended maximum drying temperature for
the BOTTOM stage is 170°F.
SMALL GRAIN — For drying small grain (wheat,
oats, milo), 170°F is suggested for the TOP stage.
RICE, SOYBEANS — Drying temperatures are criti-
cal in drying rice and soybeans. A temperature of
140°F is recommended for the top stage to keep
grain temperature low.
SUNFLOWERS — Sunflower seed drying requires
special care and operating precautions. Contact fac-
tory for additional information and drying recommen-
dations.
DRYING EFFICIENCY — The general rule for
obtaining highest drying efficiency is to use the
HIGHEST possible drying temperatures which will
not adversely affect grain quality.
FULL HEAT DRYING
FULL HEAT OPERATION — With this type of drying,
the grain is discharged hot, with no cooling. Drying
capacity is substantially higher with FULL HEAT than
the DRY AND COOL process. Refer to FULL HEAT
headings in the Drying Tables ahead for dryer capac-
ity, settings, and other information.
DRYERATION PROCESS — The full heat process is
called "Dryeration." The recommended procedure is
to temper the hot grain for 4 to 10 hours in a cooling
bin or storage bin, then cool by an aeration fan at an
air flow rate of 1/2 to 1 CFM per bushel of grain in the
hot batch being cooled. The process of tempering
and slow cooling provides higher quality in shelled
corn because of less stress cracking of kernels and
less breakage during subsequent handling of the
grain.
FINAL MOISTURE — From 1 to 3% moisture is usu-
ally removed in the cooling process, so hot shelled
corn is removed from the dryer at about 17% mois-
ture if the final desired moisture content is 15%.
FINAL MOISTURE CONTENT
It is necessary to frequently check the moisture con-
tent of discharge grain while the final meter roll set-
ting adjustment is being established, and moisture
should subsequently be checked periodically to indi-
cate the need of any change in the setting. Such a
change will be necessary if there is an appreciable
change in average initial moisture content. Setting
the automatic moisture control will minimize the
changes in discharge moisture as initial moisture
varies.
DRYER SHUTDOWN
COOLING HOT GRAIN — If the dryer is to be shut
down for more than a few hours while filled with
grain, it is recommended that hot grain be cooled for
about 10 to 15 minutes. This is especially important
in COLD weather, to prevent water vapor condensa-
tion and possible freezing of such condensate fol-
lowing shutdown.
FUEL BURN-OUT — When a vaporizer-equipped
burner is to be shut down for several hours or more,
it is recommended that pressure be relieved on the
vaporizer and supply lines by first closing the valve at
the supply tank, then letting the burner operate until
flame stops from lack of fuel; immediately turn burn-
er OFF. After the burner is OFF, close all other valves
in the fuel supply piping.
SHUTDOWN — To stop the dryer, push control cir-
cuit STOP button, move all circuit breakers OFF, turn
off the power supply disconnect (external to dryer)
and CLOSE all valves in the fuel supply lines to the
dryer.
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