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18 PNEG-552 100 Series Dryer
3. Dryer Control Panel
Special Features
Dual Batch Drying Temperature Mode
Emergency Cooling Mode
Burner ON/OFF Operation
Due to changing fuel conditions and to aid in drying wheat and other low temperature grains in hot
weather, an ON/OFF burner has been developed in recent years.
By moving the third switch, number six (#6), on the dip switch located inside the control box on the back
of the computer control board to ON, the burner can be changed from a high-low burner to an ON/OFF
burner. The burner will operate exactly the same as the high-low burner, however, when the setpoint is
reached, the burner cycles OFF instead of switching to a lower pressure. The vaporizer cools much more
quickly and allows a closer tolerance on the setpoint and to operate at lower temperature rises.
Safety Circuit Shut Down Messages
Vapor High Temperature
This shut down message indicates that the LP gas vapor temperature sensor, located in the gas pipe
train downstream from the vaporizer has opened. This indicates that the vaporizer is running too hot and
must be readjusted. This sensor is set at 200°F and automatically resets itself when cool.
To greatly improve quality in batch mode, reduce the plenum temperature at the end of the
drying cycle. This will reduce peak temperature that the grain on the inside of the column
attains and thereby reduce over-drying.
Enter dual batch drying temperature mode by switching ON dip switch number four (4), the
fourth switch from the bottom, on the dip switches located inside the control box on the
back of the computer control board. This enables two plenum and two grain temperature
settings, high and low. Set these parameters the same way the single plenum and grain
temperature settings are made. The first of each temperatures being set will be the low
setting and will be indicated by the word “Low” on the screen. The second setting will be
identified by “High” on the display screen.
Typically, the plenum settings would be 170 for low and 230 for high and the low grain
temperature setting would be 10° to 20° below the normal moisture control temperature
setting which becomes the new high setting.
Both capacity and quality will improve using this feature while operating in batch dry and
cool or all heat modes.
To enter an emergency cooling mode, switch ON switch number seven (#7), which is the
second switch from the top on the dip switch inside of the control box on the back of the
computer control board. This initiates a mode in which only the dryer fan runs, in case there
is a plenum temperature or grain high-limit warning. When either of these safeties shuts
down the dryer, run the fan to help cool the grain and/or plenum high-limit back down to a
safe level. After flipping the switch, press the Start button and only the fan will run for
approximately five minutes.