GRAIN DRYER & PARTS BOOK - Opico

2. PLENUM HIGH LIMIT CONTROL
The high limit control safeguards against excessive plenum temperatures. The maximum temperature is
factory set and microprocessor controlled. An additional high limit thermostat is placed in the plenum and acts in
conjunction with the microprocessor. During the initial start-up of the dryer the microprocessor checks the high
limit thermostat to make certain the plenum temperature falls within the operating range. If so, operation continues
and the dryer begins the cycle. Should the thermostat open at any time during operation, power to the controller
will be interrupted, halting operation of the entire unit.
3. LOADING THE BIN
DANGER
The loading auger operates automatically and may start without notice. Make certain that the auger is
free of debris and that everyone stays clear of the intake. Failure to do so may result in serious injury
or death.
The standard loading hopper may be used in conjunction with bin unloading equipment or it may be
extended to reach under a hopper bottom bin. An auxiliary outlet is also provided which becomes energized as
the dryer begins to load. This outlet can be used to operate an auxiliary electric auger, such as a bin unloader or
transport auger, to fill the dryer. The grain can also be loaded directly into the top of the dryer.
When the loading hopper attachment is used for filling the dryer, follow these steps to prevent the grain
from being fed into the dryer faster than the vertical auger can recirculate it. When this happens the grai.n can
build up in the bottom of the dryer until it gets into the agitator assembly and causes damage to the agitator.
A. Make sure that the vertical auger drive belt is kept tight and is not slipping.
B. Make sure the discharge holes at the top of the vertical auger housing are completely open with
the swivel head in the recirculation position.
C. Make sure that the bottom auger well is kept clean of trash or fine material build up which restricts
the flow of grain into the intake of the vertical auger.
D. The vertical auger flighting cannot be worn down at the intake end.
E. When using the folding hopper, set the grain flow regulator in the loading hopper down 1½" as
shown in the drawing. See Figure A.
Figure A
Figure B
F. Adjust the loading hopper feet so they touch the ground as the loading auger becomes fully
engaged with the drive portion of the auger. See Figure B.
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