GRAIN DRYER & PARTS BOOK - Opico

The flow chart in Figure 2C describes how the controller moves from state to state. When the unit is first
set to on, the Idle state will be active.
State Numb State Name Description
0 Idle Idle state - no automatic operations are under way
1 Fill Grain bin is being filled
2 Purge Plenum is purged of possibly explosive gases
3 Ignite Ignition of burner
4 Heat Fuel heater is being warmed
5 Dry Grain is dried
6 Cool Cooling grain
7 Unload Unload grain in bin
Table 2A - The controller, once it is set to on, can only be in one of the 8 possible states listed above.
When the controller is set to the status mode, the state name will be shown in the LCD window. If the unit has
been off and the ON key is pressed, the Idle state will be active.
Figure 2C - Controller state flow diagram. The rectangles represent the
allowed states while the labels next to the lines are the logical conditions
required to cause the transition indicated. The “+” is a logical “OR” and multiplication
is logical “AND”.
Dryer Operating Modes - There are two drying options, a filling option, an unloading option and a
mode where the dryer motors may be operated manually. While the latter is available primarily for troubleshooting,
the other four will routinely be used in the course of drying and handling the grain.
The filling and unloading options are available to allow the operator to load or unload grain from the
dryer bin.
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